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Li Z, Liu W, Rahaman MH, Chen Z, Yan J, Zhai J. Polystyrene microplastics accumulation in lab-scale vertical flow constructed wetlands: impacts and fate. JOURNAL OF HAZARDOUS MATERIALS 2024; 461:132576. [PMID: 37738848 DOI: 10.1016/j.jhazmat.2023.132576] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 08/29/2023] [Accepted: 09/16/2023] [Indexed: 09/24/2023]
Abstract
Microplastics (MPs) are ubiquitous pollutants that significantly threaten organisms and ecosystems. Constructed wetlands (CWs), a nature-based treatment technology, can effectively remove MPs from wastewater. However, the responses of CWs when exposed to MPs remain unclear. In this study, lab-scale vertical flow constructed wetlands (VFCWs) were installed for receiving polystyrene (PS) MPs at concentrations of 100 μg/L and 1000 μg/L. The results showed that exposure to PS-MPs has no effects on COD and TP removal in VFCWs, but TN removal decreased by 3.69-5.37 %. Further investigation revealed that PS-MPs significantly impacted microbial communities and metabolic functions. The abundances of predominant nitrifiers (Nitrospira and Nitrosomonas) and denitrifiers (Nakamurella, Bradyrhizobium, and Bacillus) in VFCWs were significantly reduced, aligning with the responses of key enzymes. The presence of PS-MPs also decreased nitrogen removal by plant uptake, leading to decreased plant biomass and chlorophyll by 39.32-48.75 % and 5.92-32.19 %, respectively. Notably, > 90 % removal rates were observed for PS-MPs within VFCWs. In addition to PS-MPs interception by VFCWs substrate, the increase of released benzenes indicated that the PS-MPs biodegradation occurred. Such insights are vital for developing sustainable solutions to mitigate MPs' adverse effects on ecosystems.
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Affiliation(s)
- Zhenchen Li
- College of Environment and Ecology, Chongqing University, Chongqing 400045, China
| | - Wenbo Liu
- Institute for Smart City of Chongqing University in Liyang, Chongqing University, Jiangsu 213300, China
| | - Md Hasibur Rahaman
- Institute for Smart City of Chongqing University in Liyang, Chongqing University, Jiangsu 213300, China
| | - Zhongbing Chen
- Department of Applied Ecology, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcka 129, Praha-Suchdol 16500, Czech Republic
| | - Jixia Yan
- College of Environment and Ecology, Chongqing University, Chongqing 400045, China
| | - Jun Zhai
- College of Environment and Ecology, Chongqing University, Chongqing 400045, China; Institute for Smart City of Chongqing University in Liyang, Chongqing University, Jiangsu 213300, China.
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Prossner KM, Harvey E, Unger MA. Exploring PAH kinetics in wild vs. transplanted triploid and diploid oysters at a contaminated field site using immunological techniques. ENVIRONMENTAL MONITORING AND ASSESSMENT 2023; 195:1462. [PMID: 37955762 PMCID: PMC10643322 DOI: 10.1007/s10661-023-12064-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Accepted: 10/28/2023] [Indexed: 11/14/2023]
Abstract
Crassostrea virginica is a well-established bivalve species for biomonitoring persistent organic pollutants such as polycyclic aromatic hydrocarbons (PAH) in aquatic environments. Differing biomonitoring methods employing either wild oysters inhabiting sites of interest or naïve cultured oysters deployed to sites for extended periods can be used for site evaluations. However, important differences in total contaminant concentrations accumulated have been observed between the wild and transplanted groups. Furthermore, although rearing cultured triploid oysters is widely popular in commercial farming, the difference in contaminant bioaccumulation potential between triploid and diploid cultured oysters is vastly understudied, particularly for organic contaminants such as PAH. This study explores differences in PAH kinetics between transplanted triploid and diploid cultured oysters and wild oysters at a PAH-impacted site during a 6-week field exposure study using novel immunological techniques: antibody-based biosensor technology and immunofluorescence visualization. Conventional chemical analysis of oyster tissue was also conducted for comparison. While differences were observed in the oyster interstitial fluid between the wild and transplanted oysters throughout the study, whole tissue analysis revealed differing trends at each time point. Our findings suggest that insufficient equilibration time may contribute to the differences observed between groups. Furthermore, when combined with visual evidence via immunofluorescence, internal partitioning of contaminants may be an important determinant for total concentrations measured. A better understanding of the differences observed between wild and transplanted oyster groups is necessary for improved biomonitoring. Our study highlights the value in employing novel immunological techniques to explore possible mechanisms driving these differences.
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Affiliation(s)
- Kristen M Prossner
- Virginia Institute of Marine Science, William & Mary, P.O. Box 1346, Gloucester Point, VA, 23062, USA
| | - Ellen Harvey
- Virginia Institute of Marine Science, William & Mary, P.O. Box 1346, Gloucester Point, VA, 23062, USA
| | - Michael A Unger
- Virginia Institute of Marine Science, William & Mary, P.O. Box 1346, Gloucester Point, VA, 23062, USA.
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Distribution and source assignments of polycyclic aromatic and aliphatic hydrocarbons in sediments and biota of the Lafayette River, VA. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:47527-47543. [PMID: 36740615 DOI: 10.1007/s11356-023-25563-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Accepted: 01/22/2023] [Indexed: 02/07/2023]
Abstract
The Lafayette River comprises a tidal sub-estuary constrained by an urban watershed that is bounded by residential areas at its upper reaches and port activity at its mouth. We determined the concentrations and distributions of polycyclic aromatic hydrocarbons (PAHs) and aliphatic n-alkanes across 19 sites from headwaters to river mouth in surface sediments (0-2 cm). Potential atmospheric sources were investigated through the analysis of wet and dry deposition samples and intact coals from a major export terminal nearby. The potential consequences for human consumption were examined through analysis of native oyster (Crassostrea virginica) and blue crab tissues (Callinectes sapidus). A suite of up to 66 parent and alkyl-substituted PAHs were detected in Lafayette sediments with total concentrations ranging from 0.75 to 39.00 µg g-1 dry wt. Concentrations of aliphatic n-alkanes (n-C16 - n-C31) ranged from 4.94 to 40.83 μg g-1 dry wt. Source assignment using diagnostic ratios and multivariate source analysis suggests multiple sources contribute to the hydrocarbon signature in this metropolitan system with automotive and atmospheric transport of coal dust as the major contributors. Oyster tissues showed similar trends as PAHs observed in sediments indicating similar sources to water column particles which ultimately accumulate in sediments with crabs showing altered distributions as a consequence of metabolism.
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Prossner KM, Small HJ, Carnegie RB, Unger MA. Immunofluorescence Visualization of Polycyclic Aromatic Hydrocarbon Mixtures in the Eastern Oyster Crassostrea virginica. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2023; 42:475-480. [PMID: 36511524 PMCID: PMC10107493 DOI: 10.1002/etc.5539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 09/10/2022] [Accepted: 12/08/2022] [Indexed: 06/17/2023]
Abstract
Bivalve mollusks including oysters have low metabolic potential and are therefore susceptible to accumulating high levels of lipophilic organic contaminants such as polycyclic aromatic hydrocarbons (PAHs). Human exposure to PAHs via consumption of this important commercial shellfish can be a serious public health concern in areas where high PAH contamination exists. Previous PAH immunohistochemical studies have been limited to laboratory-based exposures focusing on one or a few individual PAH compounds. To date, such studies have yet to explore PAH accumulation in oysters, known to have some of the highest levels of PAHs across different food products. Using a monoclonal antibody selective for a range of three- to five-ring PAHs, we present a method to detect and localize complex mixtures of PAHs in oyster tissues via fluorescent immunohistochemistry. Observed immunofluorescence intensity followed a similar trend as measured levels of PAHs in oyster interstitial fluid from PAH-contaminated sites and oysters exposed to the water accommodated fraction of crude oil. This method will be valuable in understanding internal partitioning mechanisms of PAH-exposed oysters and will have important applications in studies on PAH distribution in the tissues of additional organisms for environmental, medical, or veterinary purposes. Environ Toxicol Chem 2023;42:475-480. © 2022 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC.
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Affiliation(s)
- Kristen M. Prossner
- Virginia Institute of Marine ScienceWilliam & MaryGloucester PointVirginiaUSA
| | - Hamish J. Small
- Virginia Institute of Marine ScienceWilliam & MaryGloucester PointVirginiaUSA
| | - Ryan B. Carnegie
- Virginia Institute of Marine ScienceWilliam & MaryGloucester PointVirginiaUSA
| | - Michael A. Unger
- Virginia Institute of Marine ScienceWilliam & MaryGloucester PointVirginiaUSA
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Prossner KM, Vadas GG, Harvey E, Unger MA. A novel antibody-based biosensor method for the rapid measurement of PAH contamination in oysters. ENVIRONMENTAL TECHNOLOGY & INNOVATION 2022; 28:102567. [PMID: 36204483 PMCID: PMC9531917 DOI: 10.1016/j.eti.2022.102567] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Conventional PAH analytical methods are time-consuming and expensive, limiting their utility in time sensitive events (i.e. oil spills and floods) or for widespread environmental monitoring. Unreliable and inefficient screening methods intended to prioritize samples for more extensive analyses exacerbate the issue. Antibody-based biosensor technology was implemented as a quantitative screening method to measure total PAH concentration in adult oysters (Crassostrea virginica) - a well-known bioindicator species with ecological and commercial significance. Individual oysters were analyzed throughout the historically polluted Elizabeth River watershed (Virginia, USA). Significant positive association was observed between biosensor and GC-MS measurements that persisted when the method was calibrated for different regulatory subsets of PAHs. Mapping of PAH concentrations in oysters throughout the watershed demonstrates the utility of this technology for environmental monitoring. Through a novel extension of equilibrium partitioning, biosensor technology shows promise as a cost-effective analysis to rapidly predict whole animal exposure to better assess human health risk as well as improve monitoring efforts.
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Woodland RJ, Harris L, Reilly E, Fireman A, Schott E, Heyes A. Food web restructuring across an urban estuarine gradient. AMBIO 2022; 51:888-900. [PMID: 34374954 PMCID: PMC8847660 DOI: 10.1007/s13280-021-01610-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 06/05/2021] [Accepted: 07/20/2021] [Indexed: 06/13/2023]
Abstract
Food webs in urban estuaries support valuable ecosystem services that are subject to a wide range of stressors that can degrade the structure of trophic networks. Multiple trophic pathways stabilize food webs by providing complementary diet resources for consumers but the consequences of urbanization on estuarine food webs are relatively unknown. In estuarine creeks across an urban-to-suburban gradient, we demonstrate trophic decoupling of benthic and pelagic pathways, trophic niche contraction, and increasing human health risk arising with the same factors that are associated with ecological degradation. This suggests an urban estuarine paradox-human activities often create larger volumes of deep water habitat, yet human activities also render much of this area unproductive with measurable opportunity costs to food webs. Our findings emphasize the shared consequences of environmental degradation for the ecological integrity of urban estuaries and the health of urban communities that rely on estuaries for sustenance.
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Affiliation(s)
- Ryan J. Woodland
- Chesapeake Biological Laboratory, University of Maryland Center for Environmental Science, 146 Williams St, PO Box 38, Solomons, MD 20688 USA
| | - Lora Harris
- Chesapeake Biological Laboratory, University of Maryland Center for Environmental Science, 146 Williams St, PO Box 38, Solomons, MD 20688 USA
| | - Erin Reilly
- Chesapeake Biological Laboratory, University of Maryland Center for Environmental Science, 146 Williams St, PO Box 38, Solomons, MD 20688 USA
- James River Association, 211 Rocketts Way, Suite 200, Richmond, VA 23231 USA
| | - Alexandra Fireman
- Chesapeake Biological Laboratory, University of Maryland Center for Environmental Science, 146 Williams St, PO Box 38, Solomons, MD 20688 USA
- Department of Biology and Archie Carr Center for Sea Turtle Research, University of Florida, PO Box 118525, Gainesville, FL 32605 USA
| | - Eric Schott
- Institute of Marine & Environmental Technology, University of Maryland Center for Environmental Science, 701 E. Pratt St, Baltimore, MD 21202 USA
| | - Andrew Heyes
- Chesapeake Biological Laboratory, University of Maryland Center for Environmental Science, 146 Williams St, PO Box 38, Solomons, MD 20688 USA
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Camargo K, Vogelbein MA, Horney JA, Dellapenna TM, Knap AH, Sericano JL, Wade TL, McDonald TJ, Chiu WA, Unger MA. Biosensor applications in contaminated estuaries: Implications for disaster research response. ENVIRONMENTAL RESEARCH 2022; 204:111893. [PMID: 34419473 PMCID: PMC8639622 DOI: 10.1016/j.envres.2021.111893] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 08/10/2021] [Accepted: 08/12/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND Given the time and monetary costs associated with traditional analytical chemistry, there remains a need to rapidly characterize environmental samples for priority analysis, especially within disaster research response (DR2). As PAHs are both ubiquitous and occur as complex mixtures at many National Priority List sites, these compounds are of interest for post-disaster exposures. OBJECTIVE This study tests the field application of the KinExA Inline Biosensor in Galveston Bay and the Houston Ship Channel (GB/HSC) and in the Elizabeth River, characterizing the PAH profiles of these region's soils and sediments. To our knowledge, this is the first application of the biosensor to include soils. METHODS The biosensor enables calculation of total free PAHs in porewater (C free), which is confirmed through gas chromatography-mass spectrometry (GC-MS) analysis. To determine potential risk of the collected soils the United States Environmental Protection (USEPA) Agency's Regional Screening Level (RSL) Calculator is used along with the USEPA Region 4 Ecological Screening Values (R4-ESV) and Refined Screening Values (R4-RSV). RESULTS Based on GC-MS results, all samples had PAH-related hazard indices below 1, indicating low noncarcinogenic risks, but some samples exceeded screening levels for PAH-associated cancer risks. Combining biosensor-based C free with Total Organic Carbon yields predictions highly correlated (r > 0.5) both with total PAH concentrations as well as with hazard indices and cancer risks. Additionally, several individual parent PAH concentrations in both the GB/HSC and Elizabeth River sediments exceeded the R4- ESV and R4-RSV values, indicating a need for follow-up sediment studies. CONCLUSIONS The resulting data support the utility of the biosensor for future DR2 efforts to characterize PAH contamination, enabling preliminary PAH exposure risk screening to aid in prioritization of environmental sample analysis.
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Affiliation(s)
- Krisa Camargo
- Department of Veterinary Integrative Biosciences - Interdisciplinary Faculty of Toxicology (IFT), Texas A&M University, College Station, TX, 77843, USA; Texas A&M University Geochemical and Environmental Research Group, College Station, TX, 77845, USA
| | - Mary Ann Vogelbein
- Department of Aquatic Health Sciences, Virginia Institute of Marine Science, William & Mary, Gloucester Point, VA, 23062, USA
| | - Jennifer A Horney
- Epidemiology Program, University of Delaware, Newark, DE, 19716, USA
| | - Timothy M Dellapenna
- Department of Marine and Coastal Environmental Science, Texas A&M University Galveston, Galveston, TX, 77554, USA
| | - Anthony H Knap
- Department of Veterinary Integrative Biosciences - Interdisciplinary Faculty of Toxicology (IFT), Texas A&M University, College Station, TX, 77843, USA; Texas A&M University Geochemical and Environmental Research Group, College Station, TX, 77845, USA
| | - Jose L Sericano
- Department of Veterinary Integrative Biosciences - Interdisciplinary Faculty of Toxicology (IFT), Texas A&M University, College Station, TX, 77843, USA; Texas A&M University Geochemical and Environmental Research Group, College Station, TX, 77845, USA
| | - Terry L Wade
- Department of Veterinary Integrative Biosciences - Interdisciplinary Faculty of Toxicology (IFT), Texas A&M University, College Station, TX, 77843, USA; Texas A&M University Geochemical and Environmental Research Group, College Station, TX, 77845, USA
| | - Thomas J McDonald
- Department of Veterinary Integrative Biosciences - Interdisciplinary Faculty of Toxicology (IFT), Texas A&M University, College Station, TX, 77843, USA; School of Public Health, Texas A&M University, College Station, TX, 77843, USA
| | - Weihsueh A Chiu
- Department of Veterinary Integrative Biosciences - Interdisciplinary Faculty of Toxicology (IFT), Texas A&M University, College Station, TX, 77843, USA
| | - Michael A Unger
- Department of Aquatic Health Sciences, Virginia Institute of Marine Science, William & Mary, Gloucester Point, VA, 23062, USA.
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Su J, Hao H, Lv X, Jin X, Yang Q. Properties and mechanism of hexavalent chromium removal by FeS@ graphite carbon nitride nanocomposites. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.124751] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Kaya D, Sowers KR, Demirtepe H, Stiell B, Baker JE, Imamoglu I, Kjellerup BV. Assessment of PCB contamination, the potential for in situ microbial dechlorination and natural attenuation in an urban watershed at the East Coast of the United States. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 683:154-165. [PMID: 31129325 DOI: 10.1016/j.scitotenv.2019.05.193] [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: 03/03/2019] [Revised: 05/07/2019] [Accepted: 05/14/2019] [Indexed: 06/09/2023]
Abstract
Sediment contamination is a major environmental issue in many urban watersheds and coastal areas due to the potential toxic effects of contaminants on biota and human health. Characterizing and delineating areas of sediment contamination and toxicity are important goals of coastal resource management in terms of ecological and economical perspectives. Core and surficial sediment samples were collected from an industrialized urban watershed at the East Coast of the United Stated and analyzed to evaluate the PCB contamination profile and toxicity resulting from dioxin-like PCBs as well as reductive dechlorination potential of indigenous PCB halorespiring bacteria through dechlorination activity assays. To support the experimental results an anaerobic dechlorination model was applied to identify microbial dechlorination pathways. The total PCB concentration in core samples ranged from 3.9 to 225.6 ng/g·dry weight (dw) decreasing with depth compared to 353.2 to 1213.7 ng/g·dw in surficial samples. The results of this study indicated an increase in PCB contamination over the last century as the industrial activity intensified. The toxicity resulting from dioxin-like PCBs was reduced up to 94% in core samples via 21 pathways resulting from the dechlorination model. Dechlorination rates in surficial sediment were between 1.8 and 13.2 · 10-3 mol% PCB116/day, while lower rates occurred in the core sediment samples. Dechlorination was achieved mainly through meta followed by para dechlorination. However, the rarer ortho dechlorination was also observed. Detection of indigenous PCB dechlorinating bacteria in the sediments and reduction of toxicity indicated potential for natural attenuation when point and nonpoint source PCBs in the urban watershed are controlled and PCB loading reduced.
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Affiliation(s)
- Devrim Kaya
- University of Maryland College Park, Department of Civil and Environmental Engineering, 1146 Glenn L. Martin Hall, College Park, MD 20742, USA
| | - Kevin R Sowers
- University of Maryland Baltimore County, Institute of Marine & Environmental Technology, 701 E. Pratt Street, Baltimore, MD 21202, USA
| | - Hale Demirtepe
- Middle East Technical University, Department of Environmental Engineering, Ankara, Turkey
| | | | - Joel E Baker
- University of Washington Tacoma, The Center for Urban Waters, 1900 Commerce Street, Tacoma, WA 98402-3100, USA
| | - Ipek Imamoglu
- Middle East Technical University, Department of Environmental Engineering, Ankara, Turkey
| | - Birthe V Kjellerup
- University of Maryland College Park, Department of Civil and Environmental Engineering, 1146 Glenn L. Martin Hall, College Park, MD 20742, USA.
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Hartzell SE, Unger MA, Vadas GG, Yonkos LT. Evaluating porewater polycyclic aromatic hydrocarbon-related toxicity at a contaminated sediment site using a spiked field-sediment approach. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2018; 37:893-902. [PMID: 29091334 PMCID: PMC7950998 DOI: 10.1002/etc.4023] [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: 07/12/2017] [Revised: 08/16/2017] [Accepted: 10/29/2017] [Indexed: 05/14/2023]
Abstract
Although the complexity of contaminant mixtures in sediments can confound the identification of causative agents of adverse biological response, understanding the contaminant(s) of primary concern at impacted sites is critical to sound environmental management and remediation. In the present study, a stock mixture of 18 polycyclic aromatic hydrocarbon (PAH) compounds was prepared to reflect the variety and relative proportions of PAHs measured in surface sediment samples collected from discrete areas of a historically contaminated industrial estuary. This site-specific PAH stock mixture was spiked into nontoxic in-system and out-of-system field-collected reference sediments in dilution series spanning the range of previously measured total PAH concentrations from the region. Spiked sediments were evaluated in 10-d Leptocheirus plumulosus tests to determine whether toxicity in laboratory-created PAH concentrations was similar to the toxicity found in field-collected samples with equivalent PAH concentrations. The results show that toxicity of contaminated sediments was not explained by PAH exposure, while indicating that toxicity in spiked in-system (fine grain, high total organic carbon [TOC]) and out-of-system (course grain, low TOC) sediments was better explained by porewater PAH concentrations, measured using an antibody-based biosensor that quantified 3- to 5-ring PAHs, than total sediment PAH concentrations. The study demonstrates the application of site-specific spiking experiments to evaluate sediment toxicity at sites with complex mixtures of multiple contaminant classes and the utility of the PAH biosensor for rapid sediment-independent porewater PAH analysis. Environ Toxicol Chem 2018;37:893-902. © 2017 SETAC.
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Affiliation(s)
- Sharon E. Hartzell
- Environmental Science and Technology Department, University of Maryland, College Park, Maryland, USA
| | - Michael A. Unger
- Virginia Institute of Marine Science, College of William & Mary, Gloucester Point, Virginia, USA
| | - George G. Vadas
- Virginia Institute of Marine Science, College of William & Mary, Gloucester Point, Virginia, USA
| | - Lance T. Yonkos
- Environmental Science and Technology Department, University of Maryland, College Park, Maryland, USA
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