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Chen Y, Liu X, Zhou Y, Zhang L, Mao L, Zhu L, Zheng Y. Bioavailability evaluation of epoxiconazole and difenoconazole in rice and the influence of dissolved organic matter in reducing uptake and translocation. CHEMOSPHERE 2023; 341:140060. [PMID: 37673178 DOI: 10.1016/j.chemosphere.2023.140060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 07/24/2023] [Accepted: 09/02/2023] [Indexed: 09/08/2023]
Abstract
The aim of this study was to assess the bioavailability of epoxiconazole (EPO) and difenoconazole (DIF) in rice plants by evaluating their uptake, translocation, and accumulation. The results showed that the concentration of DIF in the roots was approximately three times higher than EPO, and both accumulated mainly in the roots. In addition, EPO continued to be transported from stems to leaves, causing a rise in its concentration in leaves. Contrastingly, only a minimal amount of DIF was transported to the leaves. This phenomenon is mainly governed by their differing octanol-water partition coefficient. The effects of dissolved organic carbon (DOC) on the accumulation of EPO and DIF in the roots were similar to those of the freely dissolved concentration measured by OECAMs. The concentrations of EPO and DIF in the roots and OECAMs consistently decreased with increasing DOC levels. Furthermore, a significant linear relationship was observed between the EPO and DIF concentrations in root and OECAMs. We also confirmed the accuracy and usefulness of the OECAMs method in predicting the bioavailability of EPO and DIF in rice roots. Therefore, OECAMs show good potential for use as a passive sampler to evaluate the bioavailability of EPO and DIF.
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Affiliation(s)
- Yajie Chen
- Department of Applied Chemistry, College of Science, China Agricultural University, Beijing, 100193, China
| | - Xingang Liu
- State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China.
| | - Yanming Zhou
- Environment Division, Institute for the Control of Agrochemicals, Ministry of Agriculture and Rural Affairs, Beijing, 100125, China.
| | - Lan Zhang
- State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Liangang Mao
- State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Lizhen Zhu
- State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Yongquan Zheng
- State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
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2
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Lao W. Incorporating performance reference compounds in retractable/reusable solid phase microextraction fiber for passive sampling of hydrophobic organic contaminants in water. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 872:162252. [PMID: 36801335 DOI: 10.1016/j.scitotenv.2023.162252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 02/08/2023] [Accepted: 02/10/2023] [Indexed: 06/18/2023]
Abstract
Solid phase microextraction (SPME) has been used to measure aqueous-phase hydrophobic organic chemicals (HOCs) in equilibrium passive sampling mode for over two decades. However, determination of the extent of equilibrium has not been well-established for the retractable/reusable SPME sampler (RR-SPME), especially in the field applications. The goal of this study was to establish a method regarding to sampler preparation and data processing to characterize the extent of equilibrium of HOCs on the RR-SPME (100-μm thickness of polydimethylsiloxane (PDMS) coating) by incorporating performance reference compounds (PRCs). A fast (4 h) PRC loading protocol was identified with using a ternary solvent mixture (i.e., acetone-methanol-water mixture (4:4:2, v/v)) to accommodate diverse carrier solvents of the PRCs. The isotropy of the RR-SPME was validated by a paired, co-exposure approach with 12 different PRCs. The aging factors measured with the co-exposure method approximately equal to one, indicating the isotropic behavior was not changed after storage at 15 °C and -20 °C for 28 days. As a method demonstration, the PRC-loaded RR-SPME samplers were deployed in the ocean off Santa Barbara, CA (USA) for 35 days. The PRCs approaching the extents of equilibrium ranged from 20 ± 15.5 % to 96.5 ± 1.5 % and showed a declining trend along with log KOW increase. A generic equation relationship was deduced based on a correlation relationship of desorption rate constant (k2) and log KOW to extrapolate non-equilibrium correction factor from the PRCs to the HOCs. The merit of the present study is manifested by its theory and implement to enable the RR-SPME passive sampler to be utilized in environmental monitoring.
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Affiliation(s)
- Wenjian Lao
- Southern California Coast Water Research Project Authority, Costa Mesa 92626, CA, USA.
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3
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Qiu J, Craven CB, Wawryk NJP, Ouyang G, Li XF. Unique On-Site Spinning Sampling of Highly Water-Soluble Organics Using Functionalized Monolithic Sorbents. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:8094-8102. [PMID: 35622959 PMCID: PMC9228052 DOI: 10.1021/acs.est.2c01202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Revised: 05/11/2022] [Accepted: 05/12/2022] [Indexed: 06/15/2023]
Abstract
Water utilities encounter unpredictable odor issues that cannot be explained by routine water parameters during spring runoff, even in the summer and fall. Highly water-soluble organics (e.g., amino acids and saccharides) have been reported to form odorous disinfection byproducts during disinfection, but the lack of simple and practical on-site sampling techniques hampers their routine monitoring at trace levels in source water. Therefore, we have created two functionalized nested-in-sponge silica monoliths (NiS-SMs) using a one-pot synthesis method and demonstrated their application for extracting highly soluble organics in water. The NiS-SMs functionalized with the sulfonic group and phenylboronic moiety selectively extracted amino acids and monosaccharides, respectively. We further developed a spinning sampling technique using the composites and evaluated its robust performance under varying water conditions. The spinning sampling coupled to high-performance liquid chromatography tandem mass spectrometry analysis provided limits of detection for amino acids at 0.038-0.092 ng L-1 and monosaccharides at 0.036-0.14 ng L-1. Using the pre-equilibrium sampling-rate calibration, we demonstrated the applicability of the spinning sampling technique for on-site sampling and monitoring of amino acids and monosaccharides in river water. The new composite materials and rapid on-site sampling technique are unique and efficient tools for monitoring highly soluble organics in water sources.
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Affiliation(s)
- Junlang Qiu
- Division
of Analytical and Environmental Toxicology, Department of Laboratory
Medicine and Pathology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta T6G 2G3, Canada
- School
of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
| | - Caley B. Craven
- Division
of Analytical and Environmental Toxicology, Department of Laboratory
Medicine and Pathology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta T6G 2G3, Canada
| | - Nicholas J. P. Wawryk
- Division
of Analytical and Environmental Toxicology, Department of Laboratory
Medicine and Pathology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta T6G 2G3, Canada
| | - Gangfeng Ouyang
- School
of Chemistry, Sun Yat-sen University, Guangzhou 510006, China
| | - Xing-Fang Li
- Division
of Analytical and Environmental Toxicology, Department of Laboratory
Medicine and Pathology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta T6G 2G3, Canada
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4
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Cheng J, Chen X, Tian L, Wan Q, Yu X. Comparison of Different Chemical Extraction Methods for Predicting the Bioavailability and Phytotoxicity of Soil PAEs to Green Vegetables (Brassica Rapa Var. Chinensis). BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2022; 108:1081-1087. [PMID: 35254467 DOI: 10.1007/s00128-022-03490-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Accepted: 02/16/2022] [Indexed: 06/14/2023]
Abstract
The aim of the present study was to compare the predictive ability of four chemical extraction methods, i.e., Tenax, hydroxypropyl[β]cyclodextrin (HPCD), n-butanol and low-molecular-weight-organic-acids (LMWOA), for predicting the bioavailability and phytotoxicity of soil phthalic acid esters to the green vegetable Shanghaiqing (SHQ). Results showed that the extraction ability of different extraction methods varies significantly. For dibutyl phthalate (DBP), the extraction ability followed the order of Tenax > LMWOA > HPCD > n-butanol. For di-(2-ethylhexyl) phthalate (DEHP), the order of the extraction ability was n-butanol > HPCD > Tenax > LMWOA. All the extraction methods underestimated the DBP concentration while overestimating the DEHP concentration accumulated by SHQ. The concentrations of DBP and DEHP extracted by Tenax were most related to the concentrations accumulated by SHQ and the phytotoxicity indicators of SHQ. Tenax can serve as a good chemical extractant to assess the bioavailability and phytotoxicity of soil DBP and DEHP to SHQ.
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Affiliation(s)
- Jinjin Cheng
- Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, 50 Zhongling Street, Nanjing, 210014, China
- Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing, 210014, China
| | - Xiaolong Chen
- Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, 50 Zhongling Street, Nanjing, 210014, China
- Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing, 210014, China
| | - Lili Tian
- Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, 50 Zhongling Street, Nanjing, 210014, China
- Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing, 210014, China
| | - Qun Wan
- Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, 50 Zhongling Street, Nanjing, 210014, China
- Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing, 210014, China
| | - Xiangyang Yu
- Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, 50 Zhongling Street, Nanjing, 210014, China.
- Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing, 210014, China.
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5
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Chen Y, Liu X, Yuan S, Dong F, Xu J, Wu X, Zheng Y. Accumulation of epoxiconazole from soil via oleic acid-embedded cellulose acetate membranes and bioavailability evaluation in earthworms (Eisenia fetida). ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 292:118283. [PMID: 34619177 DOI: 10.1016/j.envpol.2021.118283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 09/15/2021] [Accepted: 10/03/2021] [Indexed: 06/13/2023]
Abstract
A passive sampler in the soil environment is a relatively novel technique and has had quite limited applications, especially for pesticides. Oleic acid-embedded cellulose acetate membranes (OECAMs) were developed to evaluate the bioavailability of epoxiconazole (EPO) to earthworms (Eisenia fetida). The uptake of EPO by OECAMs (R2 = 0.975) and earthworms (R2 = 0.938) was compared and found to follow a two-compartment kinetic model. EPO sampling by OECAMs reached equilibrium (94%) within 2 d. OECAM could be used to determine the concentration of EPO in soil porewater. Furthermore, a significant linear relationship (R2 = 0.990) was observed between the EPO concentrations in earthworms and the OECAMs. The EPO concentrations in the porewater and OECAMs were lower in soils with a higher organic matter (OM) content. The EPO concentrations in the porewater, earthworms, and OECAMs decreased by 64.4, 49.0, and 56.1%, respectively, in the presence of 0.5% biochar, compared with the control. Furthermore, the use of OECAMs versus earthworms for soil testing also allows you to avoid factors that increase variance in organisms, such as avoidance behaviors or feeding. Therefore, OECAMs show good potential for use as a passive sampler to evaluate the bioavailability of EPO.
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Affiliation(s)
- Yajie Chen
- State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China; College of Science, China Agricultural University, Yuanmingyuan West Road 2, Haidian District, Beijing, 100193, PR China
| | - Xingang Liu
- State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China.
| | - Shankui Yuan
- Environment Division, Institute for the Control of Agrochemicals, Ministry of Agriculture and Rural Affairs, Beijing, China
| | - Fengshou Dong
- State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Jun Xu
- State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Xiaohu Wu
- State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Yongquan Zheng
- State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
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6
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Xue J, Zhu X, Liu Z, Hua R, Wu X. Using silicone rubber and polyvinylchloride as equilibrium passive samplers for rapid and sensitive monitoring of pyrethroid insecticides in aquatic environments. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 728:138797. [PMID: 32339841 DOI: 10.1016/j.scitotenv.2020.138797] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 04/16/2020] [Accepted: 04/17/2020] [Indexed: 06/11/2023]
Abstract
Passive sampling to regularly identify the occurrence of pyrethroid insecticides in urban streams is a crucial work of risk management with respect to intrinsic toxicity of pyrethroids to aquatic organisms. Polymeric films, based on an equilibrium sampling principle, have found increasing use as passive samplers for hydrophobic contaminants. Herein, we investigated two thin-film samplers, namely silicone rubber (SR) and polyvinylchloride (PVC), compatible with a suite of 8 pyrethroids, for measuring freely dissolved concentrations (Cfree) in water. The characteristics of SR and PVC samplers were estimated in terms of equilibrium partitioning coefficients (Kf) with log units of 3.90-4.67 and sampling rates (Rs) of 0.011-0.016 L/h. The parameters were correlated positively with octanol-water partition coefficients of the compounds, whereas independent on water solubility. A strong agreement between Cfree obtained from the two samplers was observed in a range of 0.1-10 μg/L for pyrethroids under laboratory simulated conditions. Both of SR and PVC were confirmed as equilibrium samplers with faster sampling rates of pyrethroids that equilibrated on films within only one week, and higher accumulation at factors of 5.3-12.5 and 1.5-2.4 compared to a performance reference compound (PRC)-preload sampler. Additionally, the comparable results of the two passive sampling methods in multiple field applications indicated that the direct deployment of the two samplers without PRCs calibration can provide reliable assessment of trace concentrations. This study demonstrated the routine utilization of SR and PVC as promising tools for rapid and sensitive in-situ monitoring of pyrethroids, and indicators for the bioavailability against total chemical concentrations in variable aquatic environments.
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Affiliation(s)
- Jiaying Xue
- College of Resources and Environment, Anhui Agricultural University, Key Laboratory of Agri-food Safety of Anhui Province, Hefei 230036, PR China.
| | - Xianbin Zhu
- College of Resources and Environment, Anhui Agricultural University, Key Laboratory of Agri-food Safety of Anhui Province, Hefei 230036, PR China
| | - Zikun Liu
- College of Resources and Environment, Anhui Agricultural University, Key Laboratory of Agri-food Safety of Anhui Province, Hefei 230036, PR China
| | - Rimao Hua
- College of Resources and Environment, Anhui Agricultural University, Key Laboratory of Agri-food Safety of Anhui Province, Hefei 230036, PR China
| | - Xiangwei Wu
- College of Resources and Environment, Anhui Agricultural University, Key Laboratory of Agri-food Safety of Anhui Province, Hefei 230036, PR China
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7
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Wang S, Lao W, Li H, You J. Measuring bioconcentration factors of sediment-associated fipronil in Lumbriculus variegatus using passive sampling techniques. JOURNAL OF HAZARDOUS MATERIALS 2020; 393:122420. [PMID: 32143163 DOI: 10.1016/j.jhazmat.2020.122420] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 02/26/2020] [Accepted: 02/26/2020] [Indexed: 06/10/2023]
Abstract
Fipronil and its degradates have been detected ubiquitously in aquatic environment worldwide, yet little is known about its bioaccumulation potential. The goal of the present study was to measure bioconcentration factor (BCF) of sediment-associated fipronil in a benthic invertebrate, Lumbriculus variegatus using passive sampling techniques. Three passive samplers including polymethyl methacrylate (PMMA) film, poly(dimethylsiloxane) fiber and polyacrylate fiber were evaluated. PMMA film was identified as the preferred method and was applied to determine fipronil log KOC (3.77 ± 0.04). BCF of sediment-associated fipronil in L. variegatus was obtained through measuring freely dissolved concentration (Cfree). Because fipronil degraded in sediment, time weighted average (TWA) Cfree was estimated for calculating BCFTWA (1855 ± 293 mL/g lipid). Fipronil BCF was also measured in a water-only bioaccumulation test of L. variegatus under constant exposure condition. This BCF value (1892 ± 76 mL/g lipid) was comparable with the BCFTWA, validating effectiveness of the passive sampling method for the measurement of sediment Cfree. Fipronil was bioaccumulative in L. variegatus according to the USEPA's criteria. The combination of Cfree and TWA concentration measurements was demonstrated to properly determine BCF value for moderately hydrophobic and degradable chemicals in sediment.
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Affiliation(s)
- Shunhui Wang
- School of Environment and Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou, 511443, China; School of Chemistry and Chemical Engineering, Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Southwest Petroleum University, Chengdu, 610500, China
| | - Wenjian Lao
- Southern California Coast Water Research Project, Costa Mesa, CA, 92626, United States.
| | - Huizhen Li
- School of Environment and Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou, 511443, China
| | - Jing You
- School of Environment and Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou, 511443, China.
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8
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Vitale CM, Knudsmark Sjøholm K, Di Guardo A, Mayer P. Accelerated equilibrium sampling of hydrophobic organic chemicals in solid matrices: A proof of concept on how to reach equilibrium for PCBs within 1 day. CHEMOSPHERE 2019; 237:124537. [PMID: 31551203 DOI: 10.1016/j.chemosphere.2019.124537] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Revised: 07/30/2019] [Accepted: 08/06/2019] [Indexed: 06/10/2023]
Abstract
Equilibrium sampling of hydrophobic organic chemicals (HOCs) is increasingly used to measure freely dissolved concentrations and chemical activities in sediments and soils. However, for the most hydrophobic chemicals (Log Kow > 6) such equilibrium sampling requires often very long sampling times in the order of weeks to months. The aim of the present study was to explore two strategies for markedly increasing the HOC mass transfer from matrix to sampler with the overall goal to shorten equilibration times down to a few hours. Two Solid Phase Microextraction (SPME) approaches were thus developed and tested in sediment and soil contaminated by polychlorinated biphenyls (PCBs). In the first method, the SPME fiber was immersed directly in the aqueous suspension of the sample under vigorous agitation. In the second method equilibration took place via the headspace and was accelerated by elevating the temperature. Headspace-SPME at 80 °C provided fast equilibration within approximately 2 h without contacting the sample and thus avoiding fiber fouling. Both SPME methods were calibrated by passive dosing from preloaded silicone rods and yielded similar results, supporting the validity of HS-SPME at elevated temperatures on a proof of principle level. Finally, by using 13C labelled PCB standards, total concentrations were simultaneously measured, which in turn allowed calculation of matrix-water distribution coefficients.
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Affiliation(s)
- Chiara Maria Vitale
- University of Insubria, Department of Science and High Technology, Como, 22100, Italy; Technical University of Denmark, Department of Environmental Engineering, Kongens Lyngby, 2800, Denmark.
| | - Karina Knudsmark Sjøholm
- Technical University of Denmark, Department of Environmental Engineering, Kongens Lyngby, 2800, Denmark; University of Copenhagen, Department of Plant and Environmental Sciences, Frederiksberg, C 1871, Denmark.
| | - Antonio Di Guardo
- University of Insubria, Department of Science and High Technology, Como, 22100, Italy.
| | - Philipp Mayer
- Technical University of Denmark, Department of Environmental Engineering, Kongens Lyngby, 2800, Denmark.
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9
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Lu Z, Gan J, Cui X, Delgado-Moreno L, Lin K. Understanding the bioavailability of pyrethroids in the aquatic environment using chemical approaches. ENVIRONMENT INTERNATIONAL 2019; 129:194-207. [PMID: 31129496 DOI: 10.1016/j.envint.2019.05.035] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2018] [Revised: 04/27/2019] [Accepted: 05/13/2019] [Indexed: 06/09/2023]
Abstract
Pyrethroids are a class of commonly used insecticides and are ubiquitous in the aquatic environment in various regions. Aquatic toxicity of pyrethroids was often overestimated when using conventional bulk chemical concentrations because of their strong hydrophobicity. Over the last two decades, bioavailability has been recognized and applied to refine the assessment of ecotoxicological effects of pyrethroids. This review focuses on recent advances in the bioavailability of pyrethroids, specifically in the aquatic environment. We summarize the development of passive sampling and Tenax extraction methods for assessing the bioavailability of pyrethroids. Factors affecting the bioavailability of pyrethroids, including physicochemical properties of pyrethroids, and quality and quantity of organic matter, were overviewed. Various applications of bioavailability on the assessment of bioaccumulation and acute toxicity of pyrethroids were also discussed. The final section of this review highlights future directions of research, including development of standardized protocols for measurement of bioavailability, establishment of bioavailability-based toxicity benchmarks and water/sediment quality criteria, and incorporation of bioavailability into future risk assessment and management actions.
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Affiliation(s)
- Zhijiang Lu
- College of Environmental and Resource Sciences, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou 310058, China; Department of Environmental Sciences, University of California, Riverside, CA 92521, United States.
| | - Jay Gan
- Department of Environmental Sciences, University of California, Riverside, CA 92521, United States
| | - Xinyi Cui
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, China
| | - Laura Delgado-Moreno
- Estación Experimental del Zaidín, Spanish National Research Council (CSIC), Granada, Spain
| | - Kunde Lin
- The Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China
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10
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Jiang R, Lin W, Zhang L, Zhu F, Ouyang G. Development of a novel solid phase microextraction calibration method for semi-solid tissue sampling. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 655:174-180. [PMID: 30469063 DOI: 10.1016/j.scitotenv.2018.11.226] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Revised: 11/14/2018] [Accepted: 11/15/2018] [Indexed: 06/09/2023]
Abstract
Accurate quantitative analysis using in vivo solid phase microextraction (SPME) for semi-solid tissue can be challenging due to the complexity of the sample matrix. In this paper, a comprehensive study was carried out on the extraction kinetics of SPME in the semi-solid sample, and subsequently proposed a new theoretical model to interpret the kinetic extraction process. Theoretically derived mathematical expressions well described the experimental desorption time profiles of the SPME process. Modelling experiments were also carried out to study the effect of sample tortuosity and binding matrix on the parameters affecting the extraction kinetics. Seven polyaromatic hydrocarbons (PAHs) and eight polychlorinated biphenyls (PCBs) in agarose gel and in real fish tissue were used for these experiments. The experimental data showed excellent agreement with theoretical prediction while providing excellent interpretation of the effect of tortuosity and binding matrix. Based on the theoretical model, an on-fiber standard calibration method with fewer internal standards was developed. The newly developed calibration method was used to quantify PAHs and PCBs in agarose gel and fish tissue. By using the proposed calibration method, a large number of organic compounds can be quantified with fewer internal standards. Current study provides the theoretical foundation for in vivo SPME quantitative semi-solid tissue analysis in the future.
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Affiliation(s)
- Ruifen Jiang
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 510632, China.
| | - Wei Lin
- KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
| | - Lifang Zhang
- Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 510632, China
| | - Fang Zhu
- KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
| | - Gangfeng Ouyang
- KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
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11
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Bartolomé N, Hilber I, Schulin R, Mayer P, Witt G, Reininghaus M, Bucheli TD. Comparison of freely dissolved concentrations of PAHs in contaminated pot soils under saturated and unsaturated water conditions. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 644:835-843. [PMID: 30743881 DOI: 10.1016/j.scitotenv.2018.06.359] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 06/28/2018] [Accepted: 06/28/2018] [Indexed: 06/09/2023]
Abstract
Passive sampling (PS, equally used for passive sampler) methods have successfully been applied in situ to quantify the bioavailability of hydrophobic organic compounds in air, water and sediments. However, very little is known on the applicability of PS in unsaturated soils. Here, we present the results of a greenhouse experiment in which we applied in situ PS methods in pots. Low density polyethylene (LDPE) and polydimethylsiloxane (PDMS) fibres with a newly developed PS holder were used to analyse freely dissolved polycyclic aromatic hydrocarbon (PAH) concentrations (Cfree) in a skeet shooting range soil and an uncontaminated control soil under water saturated and unsaturated conditions for up to nine months. A short exposure time of three months was not sufficient for the PDMS samplers to reach distribution equilibrium with the surrounding soil. Under saturated water conditions, the in situ results agreed well with measurements obtained from the conventional ex situ soil suspension method. They were in accordance with similar comparisons made in previous studies on sediments, as well as with model predictions. However, for unsaturated water conditions, the results differed considerably from the ex situ Cfree values, in particular for the light molecular weight (LMW) PAHs such as phenanthrene, fluoranthene, and pyrene. The results of the two in situ PS methods were in good agreement with each other under both soil water conditions, indicating that dissipation mechanisms, such as degradation or volatilization, led to a substantial decrease in Cfree under unsaturated conditions, especially for the LMW PAHs (log10KOW < 5.85) over a period of six months or more. Thus, in their current state of development, in situ PS methods can be used in soils under water-saturated conditions. However, an adequate method to correct for non-equilibrium conditions needs to be developed before they can be applied to unsaturated conditions, mainly for LMW PAHs.
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Affiliation(s)
- Nora Bartolomé
- Agroscope, Environmental Analytics, Reckenholzstrasse 191, 8046 Zurich, Switzerland; Department of Environmental Systems Sciences, ETH Zurich, Universitätsstrasse 16, 8092 Zurich, Switzerland
| | - Isabel Hilber
- Agroscope, Environmental Analytics, Reckenholzstrasse 191, 8046 Zurich, Switzerland
| | - Rainer Schulin
- Department of Environmental Systems Sciences, ETH Zurich, Universitätsstrasse 16, 8092 Zurich, Switzerland
| | - Philipp Mayer
- Technical University of Denmark, 2800, Kongens, Lyngby, Denmark
| | - Gesine Witt
- University of Applied Science Hamburg, D-21033 Hamburg, Germany
| | | | - Thomas D Bucheli
- Agroscope, Environmental Analytics, Reckenholzstrasse 191, 8046 Zurich, Switzerland.
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12
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Xu C, Wang J, Richards J, Xu T, Liu W, Gan J. Development of film-based passive samplers for in situ monitoring of trace levels of pyrethroids in sediment. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 242:1684-1692. [PMID: 30072218 DOI: 10.1016/j.envpol.2018.07.105] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Revised: 07/19/2018] [Accepted: 07/22/2018] [Indexed: 06/08/2023]
Abstract
Residues of pyrethroid insecticides tend to accumulate in bed sediments due to their strong hydrophobicity. Rather than the total or bulk sediment concentration, it is the freely dissolved concentration (Cfree) that drives toxicity to benthic invertebrates. In this study we developed thin film-based samplers for in situ ambient monitoring of pyrethroids at trace levels in sediment. Out of five common polymer materials, polyethylene (PE) and silicone rubber (SR), were identified to offer superior enrichment for pyrethroids from sediment. To circumvent the slow equilibrium process, 13C-permethrin and bifenthrin-d5 were preloaded onto the films as performance reference compounds (PRCs). The PRC-preloaded film samplers were deployed at five sites in Southern California under field conditions for 7 d and retrieved for analysis. The sediment porewater Cfree of eight pyrethroids derived from PRC-PE films ranged from 173 to 903 ng/L, accounting for 18.2-36.1% of the corresponding total porewater concentrations. The PRC-SR film samplers yielded Cfree values closely mimicking those from the PRC-PE samplers, cross-validating the two sampling devices. Additionally, a significant positive association was found between the observed mortality from toxicity tests using Hyalella azteca and the Cfree of bifenthrin (r = 0.628, p = 0.02). A significant linear correlation (R2 = 0.99) between Cfree derived from in situ monitoring and that of ex situ measurement under equilibrium conditions was also observed. Results from this study demonstrated that the film-based samplers may be used for in situ ambient monitoring to detect biologically relevant contamination of pyrethroids in bed sediments, which may contribute to improved risk assessment for this class of widely used insecticides.
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Affiliation(s)
- Chenye Xu
- Department of Environmental Sciences, University of California, Riverside, CA, 92521, USA; MOE Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China; School of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China
| | - Jie Wang
- Department of Environmental Sciences, University of California, Riverside, CA, 92521, USA.
| | - Jaben Richards
- Department of Environmental Sciences, University of California, Riverside, CA, 92521, USA
| | - Tianbo Xu
- Pyrethroid Working Group, 2 TW Alexander Dr. RTP, NC, 27709, USA
| | - Weiping Liu
- MOE Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Jay Gan
- Department of Environmental Sciences, University of California, Riverside, CA, 92521, USA
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13
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Zheng J, Huang J, Yang Q, Ni C, Xie X, Shi Y, Sun J, Zhu F, Ouyang G. Fabrications of novel solid phase microextraction fiber coatings based on new materials for high enrichment capability. Trends Analyt Chem 2018. [DOI: 10.1016/j.trac.2018.08.021] [Citation(s) in RCA: 83] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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14
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Lin W, Jiang R, Shen Y, Xiong Y, Hu S, Xu J, Ouyang G. Effect of dissolved organic matter on pre-equilibrium passive sampling: A predictive QSAR modeling study. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 635:53-59. [PMID: 29660727 DOI: 10.1016/j.scitotenv.2018.04.116] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Revised: 04/08/2018] [Accepted: 04/08/2018] [Indexed: 06/08/2023]
Abstract
UNLABELLED Pre-equilibrium passive sampling is a simple and promising technique for studying sampling kinetics, which is crucial to determine the distribution, transfer and fate of hydrophobic organic compounds (HOCs) in environmental water and organisms. Environmental water samples contain complex matrices that complicate the traditional calibration process for obtaining the accurate rate constants. This study proposed a QSAR model to predict the sampling rate constants of HOCs (polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs) and pesticides) in aqueous systems containing complex matrices. A homemade flow-through system was established to simulate an actual aqueous environment containing dissolved organic matter (DOM) i.e. humic acid (HA) and (2-Hydroxypropyl)-β-cyclodextrin (β-HPCD)), and to obtain the experimental rate constants. Then, a quantitative structure-activity relationship (QSAR) model using Genetic Algorithm-Multiple Linear Regression (GA-MLR) was found to correlate the experimental rate constants to the system state including physicochemical parameters of the HOCs and DOM which were calculated and selected as descriptors by Density Functional Theory (DFT) and Chem 3D. The experimental results showed that the rate constants significantly increased as the concentration of DOM increased, and the enhancement factors of 70-fold and 34-fold were observed for the HOCs in HA and β-HPCD, respectively. The established QSAR model was validated as credible (RAdj.2=0.862) and predictable (Q2=0.835) in estimating the rate constants of HOCs for complex aqueous sampling, and a probable mechanism was developed by comparison to the reported theoretical study. MAIN FINDING OF THE WORK The present study established a QSAR model of passive sampling rate constants and calibrated the effect of DOM on the sampling kinetics.
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Affiliation(s)
- Wei Lin
- MOE Key Laboratory of Aquatic Product Safety, KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
| | - Ruifen Jiang
- Guangzhou Key Laboratory of Environmental Exposure and Health, Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 510632, China.
| | - Yong Shen
- MOE Key Laboratory of Aquatic Product Safety, KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
| | - Yaxin Xiong
- MOE Key Laboratory of Aquatic Product Safety, KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
| | - Sizi Hu
- MOE Key Laboratory of Aquatic Product Safety, KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
| | - Jianqiao Xu
- MOE Key Laboratory of Aquatic Product Safety, KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
| | - Gangfeng Ouyang
- MOE Key Laboratory of Aquatic Product Safety, KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China.
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15
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He H, Gao Z, Zhu D, Guo J, Yang S, Li S, Zhang L, Sun C. Assessing bioaccessibility and bioavailability of chlorinated organophosphorus flame retardants in sediments. CHEMOSPHERE 2017; 189:239-246. [PMID: 28942249 DOI: 10.1016/j.chemosphere.2017.09.017] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2017] [Revised: 09/02/2017] [Accepted: 09/04/2017] [Indexed: 06/07/2023]
Abstract
The distribution of chlorinated organophosphate flame retardants (OPFRs) in sediments has been well documented, but the study about their bioavailability remains lacking. This study investigated the applicability of solid phase microextraction (SPME) fiber and Tenax extraction to predict the bioavailability of two chlorinated OPFRs: tri(2-chloroisopropyl) phosphate and tri(1,3-dichloro-2-isopropyl) phosphate, in sediments. Our results showed that both SPME fiber and Tenax extracted concentrations correlated significantly with the measured concentrations in the aquatic worm (Lumbriculus variegatus). We also measured the Tenax extracted concentrations at 6 and 24 h, and a strong linear relationship between these two time durations was found. In addition, the 6-h Tenax extracted concentrations also significantly correlated with the SPME fiber extracted concentrations, and the Tenax extracted concentrations were much higher than the SPME fiber extracted concentrations. These results demonstrate the efficiency of SPME and Tenax extraction methods to predict the bioavailability of chlorinated OPFRs in sediments, and it was found that the Tenax extraction is more promising than the SPME extraction.
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Affiliation(s)
- Huan He
- School of Environment, Nanjing Normal University, Nanjing 210023, PR China; The State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Zhanqi Gao
- State Environmental Protection Key Laboratory of Monitoring and Analysis for Organic Pollutants in Surface Water, Environment Monitoring Center of Jiangsu Province, Nanjing 210036, PR China; The State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China
| | - Donglin Zhu
- Jiangsu Engineering Consulting Center, Nanjing 210003, China
| | - Jiehong Guo
- School of Public and Environmental Affairs, Indiana University Bloomington, Bloomington, IN 47405, USA
| | - Shaogui Yang
- School of Environment, Nanjing Normal University, Nanjing 210023, PR China.
| | - Shiyin Li
- School of Environment, Nanjing Normal University, Nanjing 210023, PR China
| | - Limin Zhang
- School of Environment, Nanjing Normal University, Nanjing 210023, PR China
| | - Cheng Sun
- The State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China.
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16
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Lin K, Lao W, Lu Z, Jia F, Maruya K, Gan J. Measuring freely dissolved DDT and metabolites in seawater using solid-phase microextraction with performance reference compounds. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 599-600:364-371. [PMID: 28478366 DOI: 10.1016/j.scitotenv.2017.05.022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Revised: 05/02/2017] [Accepted: 05/02/2017] [Indexed: 06/07/2023]
Abstract
The coupling of disposable solid-phase microextraction (SPME) with performance reference compounds (PRCs) has been recently introduced to measure time-averaged freely dissolved concentrations (Cfree) of hydrophobic organic contaminants in sediments under laboratory conditions. To explore the use of PRC-SPME for in situ sampling in seawater, disposable PDMS fibers (35-μm and 100-μm coating) preloaded with stable isotope labeled analogues as PRCs were deployed at six stations (each with three depths) in the open ocean of the Palos Verdes Shelf (CA, USA) Superfund site for 33d to measure Cfree of DDT and its degradates. The observed values of fractional equilibration (feq) of PRCs were mostly <0.85, suggesting nonequilibrium conditions at the end of deployment. The observed feqs for the samplers varied with compound, sampling station and depth, validating the need for calibration to derive accurate Cfree. The Cfree values of DDE and DDD determined with PRC-SPME were in good agreement with those previously measured by in situ large-volume water sampling or polyethylene devices. The highest Cfree in seawater 5m off the ocean floor was 750pgL-1 for o,p'-DDE, 2170pgL-1 for p,p'-DDE, 24pgL-1 for o,p'-DDD, and 75pgL-1 for p,p'-DDD. Results of this study demonstrated the feasibility and advantages of using disposable PDMS fiber coupled with PRCs for in situ sampling.
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Affiliation(s)
- Kunde Lin
- State Key Laboratory of Marine Environmental Science, Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystem, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China; Department of Environmental Sciences, University of California, Riverside, CA 92521, United States.
| | - Wenjian Lao
- Southern California Coastal Water Research Project Authority (SCCWRP), Costa Mesa, CA 92626, United States
| | - Zhijiang Lu
- Department of Environmental Sciences, University of California, Riverside, CA 92521, United States
| | - Fang Jia
- Department of Environmental Sciences, University of California, Riverside, CA 92521, United States
| | - Keith Maruya
- Southern California Coastal Water Research Project Authority (SCCWRP), Costa Mesa, CA 92626, United States
| | - Jay Gan
- Department of Environmental Sciences, University of California, Riverside, CA 92521, United States
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17
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Liao C, Richards J, Taylor AR, Gan J. Development of polyurethane-based passive samplers for ambient monitoring of urban-use insecticides in water. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2017; 231:1412-1420. [PMID: 28939123 DOI: 10.1016/j.envpol.2017.09.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Revised: 08/09/2017] [Accepted: 09/01/2017] [Indexed: 06/07/2023]
Abstract
Widespread use of insecticides for the control of urban pests such as ants, termites, and spiders has resulted in contamination and toxicity in urban aquatic ecosystems in different regions of the world. Passive samplers are a convenient and integrative tool for in situ monitoring of trace contaminants in surface water. However, the performance of a passive sampler depends closely on its affinity for the target analytes, making passive samplers highly specific to the types of contaminants being monitored. The goal of this study was to develop a passive sampler compatible with a wide range of insecticides, including the strongly hydrophobic pyrethroids and the weakly hydrophobic fipronil and organophosphates. Of six candidate polymeric thin films, polyurethane film (PU) was identified to be the best at enriching the test compounds. The inclusion of stable isotope labeled analogs as performance reference compounds (PRCs) further allowed the use of PU film for pyrethroids under non-equilibrium conditions. The PU sampler was tested in a large aquarium with circulatory water flow, and also deployed at multiple sites in surface streams in southern California. The concentrations of pesticides derived from the PU sampler ranged from 0.5 to 18.5 ng/L, which were generally lower than the total chemical concentration measured by grab samples, suggesting that suspended particles and dissolved organic matter in water rendered them less available. The influence of suspended particles and dissolved organic matter on bioavailability was more pronounced for pyrethroids than for fipronils. The results show that the developed PU film sampler, when coupled with PRCs, may be used for rapid and sensitive in-situ monitoring of a wide range of insecticides in surface water.
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Affiliation(s)
- Chunyang Liao
- Department of Environmental Sciences, University of California, Riverside, CA 92521, United States; State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
| | - Jaben Richards
- Department of Environmental Sciences, University of California, Riverside, CA 92521, United States
| | - Allison R Taylor
- Department of Environmental Sciences, University of California, Riverside, CA 92521, United States
| | - Jay Gan
- Department of Environmental Sciences, University of California, Riverside, CA 92521, United States
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18
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Böhm L, Düring RA, Bruckert HJ, Schlechtriem C. Can solid-phase microextraction replace solvent extraction for water analysis in fish bioconcentration studies with highly hydrophobic organic chemicals? ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2017; 36:2887-2894. [PMID: 28488290 DOI: 10.1002/etc.3854] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2017] [Revised: 05/02/2017] [Accepted: 05/08/2017] [Indexed: 06/07/2023]
Abstract
With the aim to refine water analysis in fish bioconcentration studies, automated solid-phase microextraction (SPME) was used as an alternative approach to conventional solvent extraction (liquid-liquid extraction [LLE]) for the extraction of 3 hydrophobic organic chemicals (HOCs; log KOW 5.5-7.8) from flow-through studies with rainbow trout (Oncorhynchus mykiss). The results showed that total concentrations extracted by SPME combined with internal standards and LLE are equal. The results further verify the possibility of simultaneous extraction of total and freely dissolved HOC concentrations by SPME. Freely dissolved concentrations allow the assessment of sorption and bioavailability of HOCs in bioconcentration studies and their potential impact on resulting bioconcentration factors (BCFs). Reduction in freely dissolved water concentrations can result in an underestimation of BCFs if they are calculated based on total water concentrations. For polychlorinated biphenyl (PCB) 153, a significant increase in BCF value was observed when freely dissolved concentrations were taken into account. However, log BCF values calculated based on freely dissolved concentrations did not correlate linearly with log KOW values above 5 to 6. This pointed to further influences besides a reduction in freely dissolved water concentrations by sorption to organic matter. The results can aid in assessment of the factors that influence bioconcentration systems and also give important information regarding the possible replacement of LLE by SPME for water analysis of highly HOCs in fish bioconcentration studies. Environ Toxicol Chem 2017;36:2887-2894. © 2017 The Authors. Environmental Toxicology and Chemistry Published by Wiley Periodicals, Inc. on behalf of SETAC.
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Affiliation(s)
- Leonard Böhm
- Institute of Soil Science and Soil Conservation, Research Center for BioSystems, Land Use and Nutrition (iFZ), Justus Liebig University Giessen, Giessen, Germany
| | - Rolf-Alexander Düring
- Institute of Soil Science and Soil Conservation, Research Center for BioSystems, Land Use and Nutrition (iFZ), Justus Liebig University Giessen, Giessen, Germany
| | - Hans-Jörg Bruckert
- Fraunhofer Institute for Molecular Biology and Applied Ecology (IME), Schmallenberg, Germany
| | - Christian Schlechtriem
- Fraunhofer Institute for Molecular Biology and Applied Ecology (IME), Schmallenberg, Germany
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19
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Zhang Y, Huang G, An C, Xin X, Liu X, Raman M, Yao Y, Wang W, Doble M. Transport of anionic azo dyes from aqueous solution to gemini surfactant-modified wheat bran: Synchrotron infrared, molecular interaction and adsorption studies. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 595:723-732. [PMID: 28407589 DOI: 10.1016/j.scitotenv.2017.04.031] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Revised: 04/04/2017] [Accepted: 04/05/2017] [Indexed: 06/07/2023]
Abstract
From the view of economic efficiency and technology sustainability, biomass adsorbent has a high potential for pollution control. In the present study, the performance of gemini 12-2-12 surfactant-modified wheat bran (MWB) for the removal of anionic azo dyes from aqueous solution was investigated. A new insight was gained into the modification mechanism through synchrotron-assisted infrared analysis and molecular interaction simulation. The equilibrium and kinetic studies for the adsorption of Acid Red 18 (AR-18), Acid Orange 7 (AO-7) and Acid Black 1 (AB-1) on MWB were conducted. The Langmuir model well fit the adsorption isotherm data. The adsorption kinetics could be described by the pseudo-second-order and intra-particle diffusion models. The results of thermodynamic studies indicated the adsorption of AR-18 and AB-1 onto MWB was endothermic and spontaneous, while the adsorption of AO-7 was exothermic. The optimum pH for the adsorption of anionic azo dyes on MWB was 3. The adsorbed amount of anionic azo dyes onto MWB decreased when NaCl concentration increased from 0 to 0.4molL-1. The potential of modified wheat bran as a suitable adsorbent for the removal of dyes from wastewater was presented in this study. The results can help understand the migration patterns of organic pollutants at wheat bran-water interface.
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Affiliation(s)
- Yan Zhang
- MOE Key Laboratory of Resources and Environmental Systems Optimization, Institute for Energy, Environment and Sustainability Research, UR-NCEPU, North China Electric Power University, Beijing 102206, China; Institute for Energy, Environment and Sustainable Communities, University of Regina, Regina S4S 0A2, Canada
| | - Guohe Huang
- MOE Key Laboratory of Resources and Environmental Systems Optimization, Institute for Energy, Environment and Sustainability Research, UR-NCEPU, North China Electric Power University, Beijing 102206, China.
| | - Chunjiang An
- Institute for Energy, Environment and Sustainable Communities, University of Regina, Regina S4S 0A2, Canada
| | - Xiaying Xin
- Institute for Energy, Environment and Sustainable Communities, University of Regina, Regina S4S 0A2, Canada
| | - Xia Liu
- Canadian Light Source, Saskatoon, S7N 2V3, Canada
| | - Maya Raman
- Bioengineering and Drug Design Lab, Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences, Indian Institute of Technology-Madras, Chennai 600 036, India
| | - Yao Yao
- Institute for Energy, Environment and Sustainable Communities, University of Regina, Regina S4S 0A2, Canada
| | - Wenxia Wang
- MOE Key Laboratory of Resources and Environmental Systems Optimization, Institute for Energy, Environment and Sustainability Research, UR-NCEPU, North China Electric Power University, Beijing 102206, China
| | - Mukesh Doble
- Bioengineering and Drug Design Lab, Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences, Indian Institute of Technology-Madras, Chennai 600 036, India
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20
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Cheng G, Sun M, Lu J, Ge X, Zhang H, Xu X, Lou L, Lin Q. Role of biochar in biodegradation of nonylphenol in sediment: Increasing microbial activity versus decreasing bioavailability. Sci Rep 2017; 7:4726. [PMID: 28680053 PMCID: PMC5498626 DOI: 10.1038/s41598-017-04787-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Accepted: 05/19/2017] [Indexed: 12/16/2022] Open
Abstract
The observed strong sorption of hydrophobic organic contaminants (HOCs) to biochar presents potential implications for HOCs bioavailability and bioaccessibility in sediments, while biochar could impact sediment microbial ecology. However, the comprehensive study on the effects of biochar on HOC biodegradation coupled with bioavailability and microbial ecology are rarely documented. In this paper, the effects of biochar on the biodegradation of nonylphenol (NP) were investigated using 3 different NP concentrations (20, 50 and 500 mg/Kg) in sediments amended with different percentage of rice straw biochar (RC). Results showed that the influence of RC on NP biodegradation varied with different NP concentrations. At low NP concentrations, RC suppressed NP biodegradation by reducing NP bioavailability, while at high NP concentrations, moderate RC addition promoted biodegradation by reducing toxicity of NP to microbes. The effects of NP on microbial community structures were significant (P < 0.01), but those of RC were not significant (P > 0.05). The RC affected microorganisms through altering NP toxicity, microbial quantity and activity, but not microbial community structures. This study indicated that there could be an optimal biochar percentage in biochar-sediment systems at different HOC concentrations, which strengthened HOC biodegradation process and accelerated biodegradation rate, forming adsorption-biodegradation coupled bioremediation.
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Affiliation(s)
- Guanghuan Cheng
- Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control (AEMPC), School of Environmental Science and Engineering, Nanjing University of Information Science &Technology, Nanjing, 210044, People's Republic of China.,Department of Environmental Engineering, Zhejiang University, Hangzhou, 310029, People's Republic of China
| | - Mingyang Sun
- Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control (AEMPC), School of Environmental Science and Engineering, Nanjing University of Information Science &Technology, Nanjing, 210044, People's Republic of China
| | - Jingrang Lu
- Office of Research and Development, U.S. Environmental Protection Agency, Cincinnati, OH, 45220, USA
| | - Xinlei Ge
- Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control (AEMPC), School of Environmental Science and Engineering, Nanjing University of Information Science &Technology, Nanjing, 210044, People's Republic of China
| | - Huihui Zhang
- Department of Environmental Engineering, Zhejiang University, Hangzhou, 310029, People's Republic of China
| | - Xinhua Xu
- Department of Environmental Engineering, Zhejiang University, Hangzhou, 310029, People's Republic of China
| | - Liping Lou
- Department of Environmental Engineering, Zhejiang University, Hangzhou, 310029, People's Republic of China.
| | - Qi Lin
- Department of Environmental Engineering, Zhejiang University, Hangzhou, 310029, People's Republic of China
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21
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Xue J, Liao C, Wang J, Cryder Z, Xu T, Liu F, Gan J. Development of passive samplers for in situ measurement of pyrethroid insecticides in surface water. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2017; 224:516-523. [PMID: 28259582 DOI: 10.1016/j.envpol.2017.02.034] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2016] [Revised: 02/15/2017] [Accepted: 02/16/2017] [Indexed: 05/15/2023]
Abstract
Pyrethroid insecticides are widely used in urban environments, and their occurrence has been recently associated with aquatic toxicity in urban surface streams. Synthetic pyrethroids are strongly hydrophobic compounds, highlighting the importance of the freely dissolved concentration (Cfree), rather than the total chemical concentration, for better prediction of potential effects in aquatic ecosystems. The goal of this study was to develop a simple, robust and field-applicable passive sampling methodology that may be used for in situ monitoring of trace levels of pyrethroids in surface water. Among a range of polymer films, polyethylene film (PE) was found to be the most efficient at absorbing pyrethroids from water. To circumvent the long equilibrium time, 13C-permethrin and bifenthrin-d5 were preloaded on the PE sampler as performance reference compounds (PRC). Desorption of isotope-labeled PRCs was found to be isotropic to the absorption of target analytes. The optimized method was first tested in large circulating tanks simulating various environmental conditions. The derived Cfree values were consistently smaller than the total aqueous concentration in salt water or water containing humic acids. The PE samplers were further deployed at multiple field sites for 7 d in Southern California and analysis demonstrated good monitoring reproducibility and sensitivity under ambient environmental conditions. The developed passive sampler approach is ideal for application for in situ sampling under field conditions, and the use of PRCs allows sampling with short and flexible time intervals.
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Affiliation(s)
- Jiaying Xue
- Department of Environmental Science, University of California, Riverside, CA 92521, USA; College of Resource and Environment, Anhui Agricultural University, Key Laboratory of Agri-food Safety of Anhui Province, Hefei 230036, China; Department of Applied Chemistry, College of Science, China Agricultural University, Beijing 100192, China
| | - Chunyang Liao
- Department of Environmental Science, University of California, Riverside, CA 92521, USA
| | - Jie Wang
- Department of Environmental Science, University of California, Riverside, CA 92521, USA
| | - Zachary Cryder
- Department of Environmental Science, University of California, Riverside, CA 92521, USA
| | - Tianbo Xu
- Bayer CropScience, 2 T. W. Alexander Drive, Research Triangle Park, NC 27709, USA
| | - Fengmao Liu
- Department of Applied Chemistry, College of Science, China Agricultural University, Beijing 100192, China
| | - Jay Gan
- Department of Environmental Science, University of California, Riverside, CA 92521, USA.
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22
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Henry HF, Suk WA. Sustainable exposure prevention through innovative detection and remediation technologies from the NIEHS Superfund Research Program. REVIEWS ON ENVIRONMENTAL HEALTH 2017; 32:35-44. [PMID: 28212109 PMCID: PMC7291821 DOI: 10.1515/reveh-2016-0037] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2016] [Accepted: 10/27/2016] [Indexed: 05/31/2023]
Abstract
Innovative devices and tools for exposure assessment and remediation play an integral role in preventing exposure to hazardous substances. New solutions for detecting and remediating organic, inorganic, and mixtures of contaminants can improve public health as a means of primary prevention. Using a public health prevention model, detection and remediation technologies contribute to primary prevention as tools to identify areas of high risk (e.g. contamination hotspots), to recognize hazards (bioassay tests), and to prevent exposure through contaminant cleanups. Primary prevention success is ultimately governed by the widespread acceptance of the prevention tool. And, in like fashion, detection and remediation technologies must convey technical and sustainability advantages to be adopted for use. Hence, sustainability - economic, environmental, and societal - drives innovation in detection and remediation technology. The National Institute of Health (NIH) National Institute of Environmental Health Sciences (NIEHS) Superfund Research Program (SRP) is mandated to advance innovative detection, remediation, and toxicity screening technology development through grants to universities and small businesses. SRP recognizes the importance of fast, accurate, robust, and advanced detection technologies that allow for portable real-time, on-site characterization, monitoring, and assessment of contaminant concentration and/or toxicity. Advances in non-targeted screening, biological-based assays, passive sampling devices (PSDs), sophisticated modeling approaches, and precision-based analytical tools are making it easier to quickly identify hazardous "hotspots" and, therefore, prevent exposures. Innovation in sustainable remediation uses a variety of approaches: in situ remediation; harnessing the natural catalytic properties of biological processes (such as bioremediation and phytotechnologies); and application of novel materials science (such as nanotechnology, advanced membranes, new carbon materials, and materials reuse). Collectively, the investment in new technologies shows promise to reduce the amount and toxicity of hazardous substances in the environment. This manuscript highlights SRP funded innovative devices and tools for exposure assessment and remediation of organic, inorganic, and mixtures of contaminants with a particular focus on sustainable technologies.
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Joyce AS, Portis LM, Parks AN, Burgess RM. Evaluating the Relationship between Equilibrium Passive Sampler Uptake and Aquatic Organism Bioaccumulation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:11437-11451. [PMID: 27680295 DOI: 10.1021/acs.est.6b03273] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
This Critcal Review evaluates passive sampler uptake of hydrophobic organic contaminants (HOCs) in water column and interstitial water exposures as a surrogate for organism bioaccumulation. Fifty-seven studies were found where both passive sampler uptake and organism bioaccumulation were measured and 19 of these investigations provided direct comparisons relating passive sampler uptake and organism bioaccumulation. Polymers compared included low-density polyethylene (LDPE), polyoxymethylene (POM), and polydimethylsiloxane (PDMS), and organisms ranged from polychaetes and oligochaetes to bivalves, aquatic insects, and gastropods. Regression equations correlating bioaccumulation (CL) and passive sampler uptake (CPS) were used to assess the strength of observed relationships. Passive sampling based concentrations resulted in log-log predictive relationships, most of which were within one to 2 orders of magnitude of measured bioaccumulation. Mean coefficients of determination (r2) for LDPE, PDMS, and POM were 0.68, 0.76, and 0.58, respectively. For the available raw, untransformed data, the mean ratio of CL and CPS was 10.8 ± 18.4 (n = 609). Using passive sampling as a surrogate for organism bioaccumulation is viable when biomonitoring organisms are not available. Passive sampling based estimates of bioaccumulation provide useful information for making informed decisions about the bioavailability of HOCs.
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Affiliation(s)
- Abigail S Joyce
- U.S. Environmental Protection Agency , ORD/NHEERL Atlantic Ecology Division Narragansett, Rhode Island 02882, United States
| | - Lisa M Portis
- Physical Therapy Department University of Rhode Island Kington, Rhode Island 02881, United States
| | - Ashley N Parks
- U.S. Environmental Protection Agency , ORD/NHEERL Atlantic Ecology Division Narragansett, Rhode Island 02882, United States
| | - Robert M Burgess
- U.S. Environmental Protection Agency , ORD/NHEERL Atlantic Ecology Division Narragansett, Rhode Island 02882, United States
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Alam MN, Pawliszyn J. Numerical Simulation and Experimental Validation of Calibrant-Loaded Extraction Phase Standardization Approach. Anal Chem 2016; 88:8632-9. [DOI: 10.1021/acs.analchem.6b01802] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Md. Nazmul Alam
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Janusz Pawliszyn
- Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
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Crampon M, Bodilis J, Le Derf F, Portet-Koltalo F. Alternative techniques to HPCD to evaluate the bioaccessible fraction of soil-associated PAHs and correlation to biodegradation efficiency. JOURNAL OF HAZARDOUS MATERIALS 2016; 314:220-229. [PMID: 27136727 DOI: 10.1016/j.jhazmat.2016.04.059] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Revised: 04/19/2016] [Accepted: 04/23/2016] [Indexed: 06/05/2023]
Abstract
The total amount of polycyclic aromatic hydrocarbons (PAHs) in soils, given by exhaustive chemical extractions, does not relate directly to environmental risk, since only a fraction may be accessible to soil organisms. The rapid PAH desorbing fraction (Frap), which is weakly and reversibly sorbed to soils, is called the bioaccessible fraction, and can be estimated by non-exhaustive aqueous extractions. In order to better estimate Frap, different mild-extractants were tested, such as various cyclodextrins, surfactants and butanol. Their extractability performances were correlated to the Kd partition coefficients of seven PAHs obtained through sorption isotherms from five soils, but also to the PAHs molecular size and to the amounts of organic matter and of some clays (smectites and kaolinites). If hydroxypropyl-β-cyclodextrin was actually a good extractant to assess PAH accessibility, the polymer of carboxymethyl-β-cyclodextrin (pCMCD) was better (with a lower cost) to estimate the rapid mass transfer between soil particles and the soil solution, depending also on soil ageing. But Frap, estimated through pCMCD extractions, did not reflect the biodegradation of the PAHs after three months in soil microcosms. The chemical method underestimated the dissipation of 3-4 ring PAHs and overestimated that of 5-6 ring PAHs. So biodegradation was not only limited by PAHs mass-transfer, but also by biological factors, favoring the access of microorganisms to residual strongly sorbed fractions of 3-4 ring PAHs, and inhibiting the degradation of accessible but highly toxic 5-6 ring PAHs.
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Affiliation(s)
- M Crampon
- COBRA UMR CNRS 6014, Université de Rouen, 55 rue saint Germain, 27000 Evreux, France; Laboratoire de Microbiologie Signaux et Microenvironnement, EA 4312, Université de Rouen, 76821 Mont Saint Aignan, France.
| | - J Bodilis
- Laboratoire de Microbiologie Signaux et Microenvironnement, EA 4312, Université de Rouen, 76821 Mont Saint Aignan, France.
| | - F Le Derf
- COBRA UMR CNRS 6014, Université de Rouen, 55 rue saint Germain, 27000 Evreux, France.
| | - F Portet-Koltalo
- COBRA UMR CNRS 6014, Université de Rouen, 55 rue saint Germain, 27000 Evreux, France.
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Böhm L, Schlechtriem C, Düring RA. Sorption of Highly Hydrophobic Organic Chemicals to Organic Matter Relevant for Fish Bioconcentration Studies. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:8316-8323. [PMID: 27362743 DOI: 10.1021/acs.est.6b01778] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
With regard to a potential underestimation of bioconcentration factors (BCF) in flow-through fish tests, sorption of 11 highly hydrophobic organic chemicals (HOCs) (log KOW 5.5-7.8) from different substance classes was systematically investigated for the first time in the presence of fish feed (FF) and filter residues (FR), the organic matter (OM) most relevant for fish bioconcentration studies. Sorption was investigated in batch-equilibrium experiments by solid-phase microextraction (SPME) resulting in partitioning coefficients of solid-water (Kd), total organic carbon-water (KTOC), and dissolved organic carbon-water (KDOC). Results prove a high affinity of HOCs for FF and FR supporting a significant impact on BCF studies and differing from sorption to Aldrich-humic acid (AHA) utilized as reference sorbent. Sorption is influenced by interactions between HOCs and OM characteristics. For FF, KDOC values were higher than KTOC values. Results help to assess the relevance of interaction of HOCs from different substance classes with OM relevant for BCF studies.
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Affiliation(s)
- Leonard Böhm
- Institute of Soil Science and Soil Conservation, Research Centre for BioSystems, Land Use and Nutrition (iFZ), Justus Liebig University Giessen , Heinrich-Buff-Ring 26-32, 35392 Giessen, Germany
| | - Christian Schlechtriem
- Fraunhofer Institute for Molecular Biology and Applied Ecology (IME) , Auf dem Aberg 1, 57392 Schmallenberg, Germany
| | - Rolf-Alexander Düring
- Institute of Soil Science and Soil Conservation, Research Centre for BioSystems, Land Use and Nutrition (iFZ), Justus Liebig University Giessen , Heinrich-Buff-Ring 26-32, 35392 Giessen, Germany
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Bao LJ, Wu X, Jia F, Zeng EY, Gan J. Isotopic exchange on solid-phase micro extraction fiber in sediment under stagnant conditions: Implications for field application of performance reference compound calibration. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2016; 35:1978-1985. [PMID: 26678218 DOI: 10.1002/etc.3345] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2015] [Revised: 11/22/2015] [Accepted: 12/14/2015] [Indexed: 06/05/2023]
Abstract
An overlooked issue for field application of in situ performance reference compound (PRC) calibration methods is the validity of the assumption that both the sorption of a target compound and desorption of its corresponding PRC follow the first-order kinetics with the same rate constants under stagnant conditions. In the present study, disposable polydimethylsiloxane fibers of 2 sizes (7 and 35 µm) impregnated with 8 (13) C-labeled or deuterated PRCs were statically deployed into different marine sediments, from which the kinetics for sorption of the target compounds and desorption of the PRCs were characterized. Nonsymmetrical profiles were observed for exchange of the target analytes and their corresponding PRCs in sediment under stagnant conditions. The hysteretic desorption of PRCs in the kinetic regime may be ascribed to the low chemical potential between the fiber and sediment porewater, which reflects the inability of water molecules to rapidly diffuse through sediment to solvate the PRCs in the aqueous layer around the fiber surface. A moderate correlation (r = 0.77 and r = 0.57, p < 0.05 for both regressions) between the PRC-calibrated equilibrium concentrations of 1,1-dichloro-2,2-bis-(chlorophenyl) ethylene (p,p'-DDE) and polychlorinated biphenyl (PCB)-153 and the lipid normalized levels in worms (Neanthes arenaceodentata) was obtained in co-exposure tests under simulating field conditions, probably resulting from slightly overestimated bioavailability because of the hysteretic desorption of PRCs and toxic effects. Environ Toxicol Chem 2016;35:1978-1985. © 2015 SETAC.
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Affiliation(s)
- Lian-Jun Bao
- State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China
- Department of Environmental Science, University of California, Riverside, California, USA
| | - Xiaoqin Wu
- Department of Environmental Science, University of California, Riverside, California, USA
| | - Fang Jia
- Department of Environmental Science, University of California, Riverside, California, USA
| | - Eddy Y Zeng
- State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China
- School of Environment, Guangzhou Key Laboratory of Environmental Exposure and Health, and Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou, China
| | - Jay Gan
- Department of Environmental Science, University of California, Riverside, California, USA
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Xu J, Huang S, Jiang R, Cui S, Luan T, Chen G, Qiu J, Cao C, Zhu F, Ouyang G. Evaluation of the availability of bound analyte for passive sampling in the presence of mobile binding matrix. Anal Chim Acta 2016; 917:19-26. [DOI: 10.1016/j.aca.2016.02.039] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2016] [Revised: 02/25/2016] [Accepted: 02/26/2016] [Indexed: 11/28/2022]
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Behzadi M, Mirzaei M. Poly(o-anisidine)/graphene oxide nanosheets composite as a coating for the headspace solid-phase microextraction of benzene, toluene, ethylbenzene and xylenes. J Chromatogr A 2016; 1443:35-42. [PMID: 27033984 DOI: 10.1016/j.chroma.2016.03.039] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2015] [Revised: 03/09/2016] [Accepted: 03/13/2016] [Indexed: 01/09/2023]
Abstract
A poly(o-anisidine)/graphene oxide nanosheets (PoA/GONSs) coating is fabricated by a simple and efficient electrochemical deposition method on steel wire. The incorporation of PoA and GONSs allows preparing a nanocomposite that can successfully integrate the advantages of both. Then, the prepared fiber is applied to the headspace solid-phase microextraction (HS-SPME) and gas chromatographic analysis of benzene, toluene, ethylbenzene and xylenes. In order to obtain an adherent, stable and efficient fiber to extract target analytes, experimental parameters related to the coating process such as deposition potential, deposition time, concentration of the monomer and concentration of GONSs were studied. The prepared composite fiber were characterized by Fourier transform infrared spectroscopy, powder X-ray diffraction and scanning electron microscopy. The effect of various parameters on the efficiency of HS-SPME process consisting of desorption temperature and time, extraction temperature and time and ionic strength were also optimized. Under the optimal conditions, the method was linear for orders of magnitude with correlation coefficients varying from 0.9888 to 0.9993. Intra- and inter-day precisions of the method were determined from mixed aqueous solutions containing 5.0 ng mL(-1) of each BTEX. The intra-day precisions varied from 3.1% for toluene to 5.7% for ethylbenzene, while the inter-day precisions varied from 4.9% for o-xylene to 7.3% for m,p-xylene. Limits of detection were in the range 0.01-0.06 ng mL(-1). The proposed method was applied to monitor BTEX compounds in some water samples and the accuracies found through spiking river water samples showed high recoveries between 92.0 and 101.2%.
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Affiliation(s)
- Mansoureh Behzadi
- Department of Chemistry, Shahid Bahonar University of Kerman, P.O. Box 76169-133, Kerman, Iran.
| | - Mohammad Mirzaei
- Department of Chemistry, Shahid Bahonar University of Kerman, P.O. Box 76169-133, Kerman, Iran; Department of Environment, Graduate University of Advanced Technology, P.O. Box 763113-3131, Kerman, Iran.
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Wang H, Liu Y, Wei S, Yao S, Zhang J, Huang H. Selective extraction and determination of fluoroquinolones in bovine milk samples with montmorillonite magnetic molecularly imprinted polymers and capillary electrophoresis. Anal Bioanal Chem 2015; 408:589-98. [PMID: 26542835 DOI: 10.1007/s00216-015-9140-1] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Revised: 10/08/2015] [Accepted: 10/21/2015] [Indexed: 02/06/2023]
Abstract
A sensitive and selective method for separating fluoroquinolones (FQs) from bovine milk samples was successfully developed using montmorillonite magnetic molecularly imprinted polymers (MMMIPs) as adsorbents. MMMIPs were prepared using montmorillonite as carrier, fleroxacin (FLE) as template molecule, and Fe3O4 magnetite as magnetic component. MMMIPs possessed high adsorption capacity of 46.3 mg g(-1) for FLE. A rapid and convenient magnetic solid-phase extraction procedure coupled with capillary electrophoresis was established with MMMIPs as adsorbents for simultaneous and selective extraction of four FQs in bovine milk samples. Limits of detection ranged between 12.9 and 18.8 μg L(-1), and the RSDs were between 1.8% and 8.6%. The proposed method was successfully applied to spike bovine milk samples with recoveries of 92.7%-108.6%.
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Affiliation(s)
- Hongwu Wang
- School of Chemistry & Chemical Engineering, Zhaoqing University, Zhaoqing, 526061, China.
| | - Yanqing Liu
- School of Chemistry & Chemical Engineering, Zhaoqing University, Zhaoqing, 526061, China
| | - Shoulian Wei
- School of Chemistry & Chemical Engineering, Zhaoqing University, Zhaoqing, 526061, China.
| | - Su Yao
- School of Chemistry & Chemical Engineering, Zhaoqing University, Zhaoqing, 526061, China
| | - Jiali Zhang
- Department of Chemistry, East China Jiaotong University, Nanchang, 330013, China
| | - Huichang Huang
- School of Chemistry & Chemical Engineering, Zhaoqing University, Zhaoqing, 526061, China
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Lai Y, Xia X, Dong J, Lin W, Mou X, Zhao P, Jiang X, Li Z, Tong Y, Zhao Y. Equilibrium State of PAHs in Bottom Sediment-Water-Suspended Sediment System of a Large River Considering Freely Dissolved Concentrations. JOURNAL OF ENVIRONMENTAL QUALITY 2015; 44:823-832. [PMID: 26024262 DOI: 10.2134/jeq2014.09.0381] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In natural waters, the equilibrium state of hydrophobic organic compounds among bottom sediment (BS), suspended sediment (SPS), and water is fundamental to infer their transfer flux and aqueous bioavailability. However, this type of information remains scarce and fragmented. This study systematically evaluated the equilibrium state of polycyclic aromatic hydrocarbons (PAHs) in the Yangtze River. Total and freely dissolved concentrations of the 16 priority PAHs in pore water and overlying water (including surface and near-bottom) of the Yangtze middle reaches were investigated, as were the concentrations of attached PAHs in SPS and BS. Results showed that concentrations of total/freely dissolved PAHs, dissolved organic carbon (DOC), and SPS in surface water were not statistically different from those in near-bottom water, and the DOC-water distribution coefficients of PAHs in pore water were not statistically different from overlying water. However, significant disequilibrium was found at the sediment-water interface; concentrations of total/freely dissolved PAHs in pore water were 1 to 2 orders of magnitude higher than those in overlying water. This study offers a complete analysis of the potential disequilibrium of PAHs in BS-water-SPS system of large rivers and suggests that distribution of hydrophobic organic compounds between BS and overlying water is essential in controlling their equilibrium state in the BS-water-SPS system of natural waters.
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Apell JN, Gschwend PM. Validating the use of performance reference compounds in passive samplers to assess porewater concentrations in sediment beds. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:10301-7. [PMID: 25093866 DOI: 10.1021/es502694g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Hydrophobic organic compounds (HOCs) like polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) tend to accumulate in sediment beds when they are released into aquatic environments. Due to this buildup of HOCs in the sediment, the highest water concentrations are often in the pore water. Passive samplers can be used in the field (i.e., in situ) to measure freely dissolved porewater concentrations if target contaminants diffusing through the sediment and into the sampler exhibit the same diffusive retardation factors as performance reference compounds (PRCs) that are diffusing out of the sampler and into the sediment. To test this assumption, polyethylene (PE) passive samplers were placed in an organic- and black- carbon-rich sediment bed in the laboratory with samplers removed every 30 days for 4 months. The concentrations of target contaminants in the PE at each time point, corrected using measures of the losses of PRCs, were in good agreement with separately measured equilibrium concentrations in a well-mixed system. Concentrations in the PE passive samplers, normalized by their polyethylene-water partition coefficients, were also in good agreement with directly measured porewater concentrations. Finally, PE-deduced porewater concentrations were compared with the traditional equilibrium partitioning models and showed that considering sorption to only organic carbon substantially overestimated porewater concentrations. However, predictions improved greatly if sorption to black carbon was also considered.
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Affiliation(s)
- Jennifer N Apell
- R. M. Parsons Laboratory, Department of Civil and Environmental Engineering Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
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