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Liu M, Lu Q, Siddique MS, Yu W. Molecular-weight dependent promotion and competition effects of natural organic matter on dissolved black carbon removal by coagulation. CHEMOSPHERE 2024; 356:141940. [PMID: 38588894 DOI: 10.1016/j.chemosphere.2024.141940] [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: 01/26/2024] [Revised: 04/03/2024] [Accepted: 04/06/2024] [Indexed: 04/10/2024]
Abstract
Dissolved black carbon (DBC) is the ubiquitous component of dissolved organic matter pools with the high reactivity for disinfection byproducts formation. However, it is unknown that the influence of molecular weight (MW) of natural organic matter (NOM) on the DBC removal from potable water sources. Therefore, it was studied that the DBC removal by coagulation in the presence of the NOM with various molecular weights. The DBC removal was promoted due to the presence of NOM and the promotion degree decreased with decreasing MW of NOM. Furthermore, the removal ratio of humic-like component increased as the MW of NOM decreased, suggesting that the competition between DBC and NOM increased with decreasing MW. The functional groups after coagulation were the same with that before coagulation as the MW of NOM varied, suggesting that the molecular structure was not the key factor of influencing the DBC removal. This study will give the deep insight into the prediction of the DBC removal ratio by coagulation based on the MW of NOM in water sources.
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Affiliation(s)
- Minmin Liu
- Key Laboratory of Drinking Water Science and Technology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
| | - Qingxuan Lu
- School of Energy and Environment, Zhongyuan University of Technology, Zhengzhou, 450007, China.
| | - Muhammad Saboor Siddique
- Institute of Environment and Ecology, Tsinghua-Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, Guangdong, China.
| | - Wenzheng Yu
- Key Laboratory of Drinking Water Science and Technology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
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2
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Cameron ES, Krishna A, Emelko MB, Müller KM. Sporadic diurnal fluctuations of cyanobacterial populations in oligotrophic temperate systems can prevent accurate characterization of change and risk in aquatic systems. WATER RESEARCH 2024; 252:121199. [PMID: 38330712 DOI: 10.1016/j.watres.2024.121199] [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: 07/12/2023] [Revised: 01/12/2024] [Accepted: 01/23/2024] [Indexed: 02/10/2024]
Abstract
Cyanobacteria increasingly threaten recreational water use and drinking water resources globally. They require dynamic monitoring to account for variability in their distribution arising from diel cycles associated with oscillatory vertical migration. While this has been discussed in marine and eutrophic freshwater contexts, reports of diurnal vertical migration of cyanobacteria in oligotrophic freshwater lakes are scant. Typical monitoring protocols do not reflect these dynamics and frequently focus only on surface water sampling approaches, and either ignore sampling time or recommend large midday timeframes (e.g., 10AM-3PM), thereby preventing accurate characterization of cyanobacterial community dynamics. To evaluate the impact of diurnal migrations and water column stratification on cyanobacterial abundance and composition, communities were characterized in a shallow well-mixed lake interconnected to a thermally stratified lake in the Turkey Lakes Watershed (Ontario, Canada) using amplicon sequencing of the 16S rRNA gene across a multi-time point sampling series in 2018 and 2022. This work showed that cyanobacteria are present in oligotrophic lakes and their community structure varies (i) diurnally, (ii) across the depth of the water column, (iii) interannually within the same lake and (iv) between different lakes that are closely interconnected within the same watershed. It underscored the need for integrating multi-timepoint, multi-depth discrete sampling guidance into lake and reservoir monitoring programs to describe cyanobacteria community dynamics and signal change to inform risk management associated with the potential for cyanotoxin production. Ignoring variability in cyanobacterial community dynamics (such as that reported herein) and reducing sample numbers can lead to a false sense of security and missed opportunities to identify and mitigate changes in trophic status and associated risks such as toxin or taste and odor production, especially in sensitive, oligotrophic systems.
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Affiliation(s)
- Ellen S Cameron
- Department of Biology, University of Waterloo, 200 University Ave. W, Waterloo, Ontario, N2L 3G1, Canada
| | - Anjali Krishna
- Department of Biology, University of Waterloo, 200 University Ave. W, Waterloo, Ontario, N2L 3G1, Canada
| | - Monica B Emelko
- Department of Civil & Environmental Engineering, University of Waterloo, 200 University Ave. W, Waterloo, Ontario, N2L 3G1, Canada
| | - Kirsten M Müller
- Department of Biology, University of Waterloo, 200 University Ave. W, Waterloo, Ontario, N2L 3G1, Canada.
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3
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Yang M, Du D, Zhu F, Wang X. Metabolomic analysis reveals the toxicity mechanisms of bisphenol A on the Microcystis aeruginosa under different phosphorus levels. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 342:123022. [PMID: 38008252 DOI: 10.1016/j.envpol.2023.123022] [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: 08/21/2023] [Revised: 11/18/2023] [Accepted: 11/20/2023] [Indexed: 11/28/2023]
Abstract
Harmful cyanobacterial blooms have been a global environmental problem. Discharge of anthropogenic pollutants and excess nutrient import into the freshwater bodies may be the biggest drivers of bloom. Bisphenol A (BPA), a typical endocrine-disrupting compound, is frequently detected in different natural waters, which was a threat to the balance of aquatic ecosystem. Yet mechanistic understanding of the bloom and microcystin generation under combined pollution conditions is still a mystery. Herein, the cellular and metabolomic responses to BPA exposure and phosphorus (P) levels in Microcystis aeruginosa were investigated throughout its growth period. The results showed that the stress response of M. aeruginosa to BPA was characterized by a decrease in growth density, an increase in P utilization, an increase in ATPase activity, a disruption of the photosynthetic system, and an increase in the production and release of microcystins (MCs). However, these effects are highly dependent on the growth stage of the cyanobacterial cell and the magnitude of the added P concentration. In addition, exposure to a high concentration (10 μM) of BPA significantly stimulated the production of 20.7% more and the release of 29.2% more MCs from M. aeruginosa cells at a low P level. The responses of reactive oxygen species (ROS), superoxide dismutase (SOD) and malondialdehyde (MDA) suggested that exposure to BPA exposure at a low P level can lead to oxidative stress in M. aeruginosa. In addition, the differentially expressed 63 metabolites showed that cell growth, energy generation and photosynthesis were mainly regulated by the metabolic network of 3-phosphoglyceric acid (3-PGA), D-glucose 6-phosphate, UDP-α-D-galactose and UDP-N-acetyl-D-galactosamine (UDP-GalNAc) metabolism. Amino acids and lipid metabolism collectively mediated MCs production and release. These findings will provide important references for the control of harmful cyanobacterial blooms under combined pollution.
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Affiliation(s)
- Meng Yang
- School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, 212013, China.
| | - Daolin Du
- School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, 212013, China.
| | - Fang Zhu
- School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, 212013, China.
| | - Xiangrong Wang
- Department of Environmental Science and Engineering, Fudan University, Shanghai, 200438, China.
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4
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Sánchez-García C, Santín C, Neris J, Sigmund G, Otero XL, Manley J, González-Rodríguez G, Belcher CM, Cerdà A, Marcotte AL, Murphy SF, Rhoades CC, Sheridan G, Strydom T, Robichaud PR, Doerr SH. Chemical characteristics of wildfire ash across the globe and their environmental and socio-economic implications. ENVIRONMENT INTERNATIONAL 2023; 178:108065. [PMID: 37562341 DOI: 10.1016/j.envint.2023.108065] [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: 01/27/2023] [Revised: 05/26/2023] [Accepted: 06/24/2023] [Indexed: 08/12/2023]
Abstract
The mobilisation of potentially harmful chemical constituents in wildfire ash can be a major consequence of wildfires, posing widespread societal risks. Knowledge of wildfire ash chemical composition is crucial to anticipate and mitigate these risks. Here we present a comprehensive dataset on the chemical characteristics of a wide range of wildfire ashes (42 types and a total of 148 samples) from wildfires across the globe and examine their potential societal and environmental implications. An extensive review of studies analysing chemical composition in ash was also performed to complement and compare our ash dataset. Most ashes in our dataset had an alkaline reaction (mean pH 8.8, ranging between 6 and 11.2). Important constituents of wildfire ash were organic carbon (mean: 204 g kg-1), calcium, aluminium, and iron (mean: 47.9, 17.9 and 17.1 g kg-1). Mean nitrogen and phosphorus ranged between 1 and 25 g kg-1, and between 0.2 and 9.9 g kg-1, respectively. The largest concentrations of metals of concern for human and ecosystem health were observed for manganese (mean: 1488 mg kg-1; three ecosystems > 1000 mg kg-1), zinc (mean: 181 mg kg-1; two ecosystems > 500 mg kg-1) and lead (mean: 66.9 mg kg-1; two ecosystems > 200 mg kg-1). Burn severity and sampling timing were key factors influencing ash chemical characteristics like pH, carbon and nitrogen concentrations. The highest readily dissolvable fractions (as a % of ash dry weight) in water were observed for sodium (18 %) and magnesium (11.4 %). Although concentrations of elements of concern were very close to, or exceeded international contamination standards in some ashes, the actual effect of ash will depend on factors like ash loads and the dilution into environmental matrices such as water, soil and sediment. Our approach can serve as an initial methodological standardisation of wildfire ash sampling and chemical analysis protocols.
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Affiliation(s)
- C Sánchez-García
- Centre for Wildfire Research, Department of Geography, Swansea University, Swansea, United Kingdom
| | - C Santín
- Centre for Wildfire Research, Department of Geography, Swansea University, Swansea, United Kingdom; Research Institute of Biodiversity (IMIB; CSIC-UniOvi-PA), Mieres, Spain
| | - J Neris
- Centre for Wildfire Research, Department of Geography, Swansea University, Swansea, United Kingdom; Universidad de La Laguna, Tenerife, Spain
| | - G Sigmund
- Environmental Technology, Wageningen University & Research, Wageningen, The Netherlands; Department of Environmental Geosciences, Centre for Microbiology and Environmental Systems Science, University of Vienna, Vienna, Austria
| | - X L Otero
- CRETUS, Departamento de Edafoloxía e Química Agrícola, Universidade de Santiago de Compostela, Campus Vida, Santiago de Compostela, Spain
| | - J Manley
- Centre for Wildfire Research, Department of Geography, Swansea University, Swansea, United Kingdom
| | | | - C M Belcher
- University of Exeter, Exeter, United Kingdom
| | - A Cerdà
- Universitat de València, Valencia, Spain
| | - A L Marcotte
- Plant Ecology and Nature Conservation, Wageningen University & Research, Wageningen, The Netherlands
| | - S F Murphy
- U.S. Geological Survey, Boulder, CO, USA
| | - C C Rhoades
- U.S. Department of Agriculture Forest Service, Rocky Mountain Research Station, Fort Collins, CO, USA
| | - G Sheridan
- The University of Melbourne, Parkville, Australia
| | - T Strydom
- South African National Parks, Skukuza, South Africa
| | - P R Robichaud
- U.S. Department of Agriculture Forest Service, Rocky Mountain Research Station, Fort Collins, CO, USA
| | - S H Doerr
- Centre for Wildfire Research, Department of Geography, Swansea University, Swansea, United Kingdom.
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5
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Correlation Analysis of the Carboxyl and Carbonyl Groups of Natural Organic Matter and the Formation Potential of Trihalomethanes and Chloral Hydrate. Molecules 2022; 27:molecules27217454. [DOI: 10.3390/molecules27217454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Revised: 10/21/2022] [Accepted: 10/26/2022] [Indexed: 11/06/2022] Open
Abstract
Natural organic matter (NOM) has always been considered the main precursor of disinfection by-products (DBPs) during the chlorine disinfection of drinking water. This research focuses on investigating the correlation between the functional group (carboxyl and carbonyl groups) content of NOM and the formation of trichloromethane (TCM) and chloral hydrate (CH). The quantitative determination of carboxyl groups, carbonyl groups, TCM, and CH were conducted during the drinking water treatment processes with different coagulant dosages and with/without pre-oxidation by KMnO4 or NaClO. The most appropriate coagulant for the removal of conventional components was polyaluminum chloride (PAC), and the dosage was 110 mg/L. Up to 43.7% and 14.5% of the carboxyl and carbonyl groups, respectively, were removed through the coagulation and sedimentation processes, which can be enhanced by increasing PAC dosage. The filtration process further increased the removal rates of these two functional groups to 59.8% and 33.5%, respectively. The formation potential of the TCM and CH decreased as the PAC dosage increased. Pre-oxidation by KMnO4 (0.8–1.0 mg/L) effectively controlled the formation of DBPs while increasing the carboxyl and carbonyl group content. Pre-oxidation by NaClO decreased the formation of TCM rather than CH, and a suitable amount (0.5–1.0 mg/L) decreased the carboxyl and carbonyl groups. It was found that there was a good linear correlation between carboxyl groups and TCM and CH. The linear fit R2 values of the carboxyl groups to TCM and CH were 0.6644 and 0.7957, respectively. The linear fit R2 values of the carbonyl groups to TCM and CH were 0.5373 and 0.7595, respectively.
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6
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Jiao Y, Zhu Y, Chen M, Wan L, Zhao Y, Gao J, Liao M, Tian X. The humic acid-like substances released from Microcystis aeruginosa contribute to defending against smaller-sized microplastics. CHEMOSPHERE 2022; 303:135034. [PMID: 35609660 DOI: 10.1016/j.chemosphere.2022.135034] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 05/17/2022] [Accepted: 05/18/2022] [Indexed: 06/15/2023]
Abstract
Microplastics (MPs) are ubiquitous in freshwater ecosystems, but knowledge of their effects on extracellular polymeric substance (EPS) produced by algae is poorly understood. The components in specific EPS fractions of Microcystis respond when exposed to MPs is also still unclear. In this study, the responses of Microcystis aeruginosa under polystyrene (PS) microplastic exposure were studied over 17 days of cultivation, using 0.1 μm and 1.0 μm sized PS at three concentration gradients (1, 10 and 100 mg/L). Results indicate that algal growth significantly increased using the 0.1 and 1.0 μm PS at a high concentration (100 mg/L) on day 17, with growth rates of 74.71% ± 0.94% and 35.87% ± 1.23%, respectively. All tested PS had a maximum inhibitory effect on the photosynthesis on day 5, but the inhibition of photosynthetic activity by 0.1 μm PS alleviated after 13 days of exposure, indicating recovery of microalgae from the toxic environment. The two PS sizes at 100 mg/L concentration triggered EPS release in the latter stage of the experiment; meanwhile, fluorescence EEM analysis showed that smaller-sized PS (0.1 μm) at various doses noticeably increased humic acid-like substances in tightly bound EPS (TB-EPS) fractions on day 17. Our findings showed that EPS release and humic acid-like substances secretion of Microcystis likely can resist MPs exposure. The results provide new insights into the toxicity mechanism of MPs on freshwater microalgae, as well as understanding the ecological risks of microplastics.
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Affiliation(s)
- Yiying Jiao
- Hubei Key Laboratory of Ecological Restoration for River-Lakes and Algal Utilization, School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan, 430068, China; Innovation Demonstration Base of Ecological Environment Geotechnical and Ecological Restoration of Rivers and Lakes, Hubei University of Technology, Wuhan, 430068, China.
| | - Yongjie Zhu
- Hubei Key Laboratory of Ecological Restoration for River-Lakes and Algal Utilization, School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan, 430068, China
| | - Mo Chen
- Hubei Key Laboratory of Regional Development and Environmental Response, Faculty of Resources and Environmental Sciences, Hubei University, Wuhan, 430062, China
| | - Liang Wan
- Hubei Key Laboratory of Ecological Restoration for River-Lakes and Algal Utilization, School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan, 430068, China; Innovation Demonstration Base of Ecological Environment Geotechnical and Ecological Restoration of Rivers and Lakes, Hubei University of Technology, Wuhan, 430068, China
| | - Yijun Zhao
- Hubei Key Laboratory of Ecological Restoration for River-Lakes and Algal Utilization, School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan, 430068, China; Innovation Demonstration Base of Ecological Environment Geotechnical and Ecological Restoration of Rivers and Lakes, Hubei University of Technology, Wuhan, 430068, China
| | - Jian Gao
- Hubei Key Laboratory of Ecological Restoration for River-Lakes and Algal Utilization, School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan, 430068, China; Innovation Demonstration Base of Ecological Environment Geotechnical and Ecological Restoration of Rivers and Lakes, Hubei University of Technology, Wuhan, 430068, China
| | - Mingjun Liao
- Hubei Key Laboratory of Ecological Restoration for River-Lakes and Algal Utilization, School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan, 430068, China; Innovation Demonstration Base of Ecological Environment Geotechnical and Ecological Restoration of Rivers and Lakes, Hubei University of Technology, Wuhan, 430068, China
| | - Xiaofang Tian
- Hubei Key Laboratory of Ecological Restoration for River-Lakes and Algal Utilization, School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan, 430068, China
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7
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Zhao J, Hu S, Zhu L, Wang W. Formation of chlorinated halobenzoquinones during chlorination of free aromatic amino acids. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 825:153904. [PMID: 35189221 DOI: 10.1016/j.scitotenv.2022.153904] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 02/11/2022] [Accepted: 02/11/2022] [Indexed: 06/14/2023]
Abstract
Chlorinated halobenzoquinones (HBQs) widely exist in drinking water as emerging disinfection byproducts (DBPs), which have attracted significant attention due to their wide occurrence and high toxicity. In this study, the formation of chlorinated HBQs from the three free aromatic amino acids, tryptophan (Trp), tyrosine (Tyr) and phenylalanine (Phe), during chlorination was investigated, the formation pathways of chlorinated HBQs were explained based on the detected intermediates and influence factors. The results revealed that four chlorinated HBQs, including 2,6-dichloro-1,4-benzoquinone (2,6-DCBQ), 2,3,5-trichloro-1,4-benzoquinone, 2,3,5,6-tetrachloro-1,4-benzoquinone and 2,6-dichloro-3-methyl-1,4-benzonquinone, were formed in chlorination of the three free aromatic amino acids, and 2,6-DCBQ was the dominant species among the formed chlorinated HBQs. Of the three free aromatic amino acids, Trp and Tyr presented relatively high yields of chlorinated HBQs than Phe. Moreover, ten intermediates were successfully detected (e.g., N,2-dichloroaniline from Trp, 2,4,6-trichlorophenol from Tyr) according to the isotope and fragment information obtained using high resolution mass spectrometry. The formation pathways of chlorinated HBQs from Trp and Tyr were proposed to include electrophilic addition, electrophilic substitution, oxidation, deacidification and dehydration reaction, and further validated using theoretical calculation. The yields of chlorinated HBQs during chlorination of the free aromatic amino acids were significantly affected by free chlorine dosage, pH and temperature.
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Affiliation(s)
- Jiaxing Zhao
- Department of Environmental Science, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou 310058, China
| | - Shaoyang Hu
- Department of Environmental Science, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou 310058, China
| | - Lizhong Zhu
- Department of Environmental Science, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou 310058, China
| | - Wei Wang
- Department of Environmental Science, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou 310058, China.
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8
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Chen H, Tsai KP, Liu Y, Tolić N, Burton SD, Chu R, Karanfil T, Chow AT. Characterization of Dissolved Organic Matter from Wildfire-induced Microcystis aeruginosa Blooms controlled by Copper Sulfate as Disinfection Byproduct Precursors Using APPI(-) and ESI(-) FT-ICR MS. WATER RESEARCH 2021; 189:116640. [PMID: 33260105 DOI: 10.1016/j.watres.2020.116640] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 11/04/2020] [Accepted: 11/12/2020] [Indexed: 06/12/2023]
Abstract
Copper-based algaecides are usually used for controlling algae bloom triggered by the elevated levels of nutrients after wildfires, resulting in the promoted reactivity of dissolved organic matter (DOM) in forming disinfectant byproducts (DBPs). To identify the best strategy for handling this source water, we employed Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) to characterize the DBPs precursors after 4-d Microcystis aeruginosa bloom cultured with black (BE) and white (WE) ash water extracts under 0, 0.5, and 1.0 mg-Cu/L. The disappeared DOM during disinfections, primarily composed of O1-14, N1O1-14 and N2O1-14, had a higher average molecular weight (MW) and double-bond equivalent (DBE), relative to DOM after incubation, regardless of disinfects and Cu2+. This result suggests assigned features with larger MW and more double bonds/rings as preferable DBP precursors. We observed a larger number of disappeared assigned features with low DBE of 1-10 in control without Cu2+ addition, possibly explaining lower DOM chlorine reactivity in forming carbonaceous and oxygenated DBPs, relative to the treatments with Cu2+ addition. We found a larger number of O1-14 and N1O1-14 with DBE=5-16 in the treatments, potentially explaining higher DOM chloramine reactivity in forming N-nitrosodimethylamine (NDMA), compared to the control. Our study suggests removing oxygen- and nitrogen-containing organic compounds with more double bonds/aromatic rings as a preferable strategy for handling source water after controlling post-fire algae blooms with copper sulfate.
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Affiliation(s)
- Huan Chen
- Biogeochemistry & Environmental Quality Research Group, Clemson University, South Carolina 29442, United States; Department of Environmental Engineering and Earth Science, Clemson University, SC 29634, United States
| | - Kuo-Pei Tsai
- Biogeochemistry & Environmental Quality Research Group, Clemson University, South Carolina 29442, United States
| | - Yina Liu
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Washington 99354, United States; Department of Oceanography, Texas A&M University, Texas 77843, United States
| | - Nikola Tolić
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Washington 99354, United States
| | - Sarah D Burton
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Washington 99354, United States
| | - Rosalie Chu
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Washington 99354, United States
| | - Tanju Karanfil
- Department of Environmental Engineering and Earth Science, Clemson University, SC 29634, United States
| | - Alex T Chow
- Biogeochemistry & Environmental Quality Research Group, Clemson University, South Carolina 29442, United States; Department of Environmental Engineering and Earth Science, Clemson University, SC 29634, United States.
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9
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Uzun H, Dahlgren RA, Olivares C, Erdem CU, Karanfil T, Chow AT. Two years of post-wildfire impacts on dissolved organic matter, nitrogen, and precursors of disinfection by-products in California stream waters. WATER RESEARCH 2020; 181:115891. [PMID: 32464419 DOI: 10.1016/j.watres.2020.115891] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 04/18/2020] [Accepted: 04/25/2020] [Indexed: 06/11/2023]
Abstract
We investigated the effects of two California wildfires (Rocky and Wragg Fires, 2015) compared to an unburned reference watershed on water quality, dissolved organic matter (DOM), and precursors of disinfection by-products (DBPs) for two years' post-fire. The two burned watersheds both experienced wildfires but differed in the proportion of burned watershed areas. Burned watersheds showed rapid water quality degradation from elevated levels of turbidity, color, and suspended solids, with greater degradation in the more extensively burned watershed. During the first year's initial flushes, concentrations of dissolved organic carbon (DOC), dissolved organic nitrogen (DON), ammonium (NH4+/NH3), and specific ultraviolet absorbance (SUVA254) were significantly higher (67 ± 40%, 418 ± 125%, 192 ± 120%, and 31 ± 17%, respectively) in the more extensively burned watershed compared to the reference watershed. These elevated values gradually declined and finally returned to levels like the reference watershed in the second year. Nitrate concentrations were near detection limits (0.01 mg-N/L) in the first year but showed a large increase in fire-impacted streams during the second rainy season, possibly due to delayed nitrification. Changes in DOM composition, especially during the initial storm events, indicated that fires can attenuate humic-like and soluble microbial by-product-like (SMP) DOM while increasing the proportion of fulvic-like, tryptophan-like, and tyrosine-like compounds. Elevated bromide (Br-) concentrations (up to 8.7 μM]) caused a shift in speciation of trihalomethanes (THMs) and haloacetic acids (HAAs) to brominated species for extended periods (up to 2 years). Wildfire also resulted in elevated concentrations of N-nitrosodimethylamine (NDMA) precursors. Such changes in THM, HAA, and NDMA precursors following wildfires pose a potential treatability challenge for drinking water treatment, but the effects are relatively short-term (≤1 year).
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Affiliation(s)
- Habibullah Uzun
- Department of Environmental Engineering, Marmara University, Istanbul, 34722, Turkey
| | - Randy A Dahlgren
- Department of Land, Air and Water Resources, University of California, Davis, California, 95616, United States
| | - Christopher Olivares
- Civil and Environmental Engineering, University of California, Berkeley, California, 94720, United States
| | - Cagri Utku Erdem
- Department of Environmental Engineering and Earth Sciences, Clemson University, Anderson, South Carolina, 29625, United States
| | - Tanju Karanfil
- Department of Environmental Engineering and Earth Sciences, Clemson University, Anderson, South Carolina, 29625, United States
| | - Alex T Chow
- Department of Environmental Engineering and Earth Sciences, Clemson University, Anderson, South Carolina, 29625, United States; Biogeochemistry & Environmental Quality Research Group, Clemson University, Georgetown, South Carolina, 29442, United States.
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10
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Chen H, Rücker AM, Su Q, Blosser GD, Liu X, Conner WH, Chow AT. Dynamics of dissolved organic matter and disinfection byproduct precursors along a low elevation gradient in woody wetlands - an implication of hydrologic impacts of climate change on source water quality. WATER RESEARCH 2020; 181:115908. [PMID: 32492591 DOI: 10.1016/j.watres.2020.115908] [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: 10/19/2019] [Revised: 04/22/2020] [Accepted: 05/02/2020] [Indexed: 06/11/2023]
Abstract
Foliar litter is an important terrestrial source of dissolved organic matter (DOM) and disinfection byproducts (DBPs) in the source water supply. Climate changes could alter precipitation patterns and hydroperiods in woody wetlands, resulting in a hydrologic shift along the low elevation gradient and change the productions of DOC and DBP precursors and their exports to source water. Here, we conducted an 80-week field decomposition study using fresh-fallen leaves along an elevation gradient, representing well-drained, relatively moist, and inundated environments, in Congaree National Park, South Carolina. The dissolved organic carbon (DOC) yield and formation potential (FP) of trihalomethanes (THMs; a dominant category of studied DBPs) were 48.9-79.7 mg-DOC/g-litter and 2.23-6.57 mg/g-litter in the freshly fallen leaf litter, respectively. The level of leachable DOM and its DBP FP decreased with time, and during the first 16 weeks of decomposition, the decomposing litter served as an important source of leachable DOM and DBP precursors. Week 28 was a turning point for DOM optical properties, with fewer tyrosine/tryptophan/soluble microbial byproduct-like compounds and more aromatic, humified, and fulvic/humic acid-like compounds. Litterfall primarily occurred from September to January, while less precipitation occurred from October to January, indicating that large amounts of DOC and DBP precursors could be leached from litterfall in February. In the first 16 weeks of field exposure study, we observed higher residual mass and lower water-extractable DOC and DTN in more inundated environments, demonstrating that the shifts of DOM composition and DBP precursors if climate reduces rainfall in the southeastern US.
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Affiliation(s)
- Huan Chen
- Baruch Institute of Coastal Ecology and Forest Science, Clemson University, Georgetown, SC, 29442, United States.
| | - Alexander Martin Rücker
- Department of Biogeochemical Processes, Max Planck Institute for Biogeochemistry, Jena, 07745, Germany
| | - Qiong Su
- Water Management & Hydrological Science, Texas A&M University, College Station, TX, 77843, United States
| | - Gavin D Blosser
- Baruch Institute of Coastal Ecology and Forest Science, Clemson University, Georgetown, SC, 29442, United States
| | - Xijun Liu
- Key Lab of Silviculture, School of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei, Anhui Province, 230061, China
| | - William H Conner
- Baruch Institute of Coastal Ecology and Forest Science, Clemson University, Georgetown, SC, 29442, United States
| | - Alex T Chow
- Baruch Institute of Coastal Ecology and Forest Science, Clemson University, Georgetown, SC, 29442, United States; Department of Environmental Engineering and Earth Science, Clemson University, South Carolina, 29634, United States
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11
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Piccardo M, Provenza F, Grazioli E, Cavallo A, Terlizzi A, Renzi M. PET microplastics toxicity on marine key species is influenced by pH, particle size and food variations. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 715:136947. [PMID: 32014774 DOI: 10.1016/j.scitotenv.2020.136947] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2019] [Revised: 01/23/2020] [Accepted: 01/24/2020] [Indexed: 06/10/2023]
Abstract
This study aims to evaluate effects induced by the exposure of key marine species to leachates and suspensions of different particle-size of PET microparticles, a plastic polymer that is actually considered safe for the environment. Leachates and suspensions of small (5-60 μm); medium (61-499 μm) and large (500-3000 μm) PET were tested on bacteria (V. fischeri; UNI EN ISO 11348-3:2009), algae (P. tricornutum; UNI EN ISO 10253:2016E), and echinoderms (P. lividus; EPA 600/R-95-136/Section 15) species both under standard (8.0) and acidified (7.5) pH conditions. Results obtained show that: i) conversely to larval stage of P. lividus, bacterial and algal tested species are not sensitive to PET pollution under all tested conditions; ii) different tested particle-sizes of PET produce effects that are not always related to their particle-size; iii) differences comparing acidified and standard pH conditions were recorded; iv) concerning echinoderms, food availability produce significant differences compared to fasting conditions; v) special attention on the possible interactions between MPs and other stressors (e.g., food and pH) is needed in order to give a better picture of natural occurring dynamics on marine ecosystems especially in the future frame of global changes.
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Affiliation(s)
- Manuela Piccardo
- Department of Life Sciences, University of Trieste, 34127 Trieste, Italy; Stazione Zoologica Anton Dohrn, 80121 Napoli, Italy
| | - Francesca Provenza
- Bioscience Research Center, via Aurelia Vecchia, 32, 58015 Orbetello, Italy
| | - Eleonora Grazioli
- Bioscience Research Center, via Aurelia Vecchia, 32, 58015 Orbetello, Italy
| | - Andrea Cavallo
- CERTEMA, Laboratorio Tecnologico di Grosseto, Borgo S. Rita, snc, Grosseto, Italy
| | - Antonio Terlizzi
- Department of Life Sciences, University of Trieste, 34127 Trieste, Italy; Stazione Zoologica Anton Dohrn, 80121 Napoli, Italy
| | - Monia Renzi
- Bioscience Research Center, via Aurelia Vecchia, 32, 58015 Orbetello, Italy.
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Lin Y, Chen A, Peng L, Luo S, Zeng Q, Shao J. Physiological characteristics and toxin production of Microcystis aeruginosa (Cyanobacterium) in response to DOM in anaerobic digestion effluent. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 685:902-910. [PMID: 31247437 DOI: 10.1016/j.scitotenv.2019.06.239] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 05/27/2019] [Accepted: 06/15/2019] [Indexed: 06/09/2023]
Abstract
The ecological implications of livestock production intensification have received sustained attention across the globe. Anaerobic digestion is the main process for livestock waste treatment. However, the ecological consequences of dissolved organic matter originating from anaerobic digestion (AD-DOM) in eutrophic water bodies remain elusive. In this study, the physiological responses of a bloom-forming cyanobacterium, Microcystis aeruginosa, to AD-DOM were investigated. Moreover, the composition of AD-DOM was identified by using thermochemolysis followed by gas chromatography-mass spectrometry (GC-MS) analysis. The growth of M. aeruginosa FACHB905 was not sensitive to low levels (0.625-1.25%, V/V) of AD-DOM but was inhibited by high levels (2.5-5%, V/V) of AD-DOM, resulting from photoinhibition damage to photosystem II (PSII). The main target of AD-DOM in PSII was the electron accepting side (ψ0) or the electron donor side (φ P0), depending on time variables. The reactive oxygen species (ROS) level showed a positive correlation with AD-DOM addition; however, it was higher than that of the control for 3.75-5% AD-DOM on the 6th day. The intracellular microcystin contents (including MC-LR and Dha7-MC-LR) decreased in response to AD-DOM addition, but extracellular microcystin increased after 6 days of exposure. In addition, GC-MS detection showed that AD-DOM is mainly composed of lignin-derived aromatic compounds, alkanes/alkene, nitrogen-containing compounds, and sterols. The results presented in this study suggested that AD-DOM released from the livestock industry may play a subtle role in affecting harmful algal blooms through level-dependent variables. In addition, the ecological consequences of microcystin released by toxin-producing species under AD-DOM stress are still worth considering.
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Affiliation(s)
- Yiqing Lin
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
| | - Anwei Chen
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
| | - Liang Peng
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
| | - Si Luo
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
| | - Qingru Zeng
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
| | - Jihai Shao
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China; Collaborative Innovation Center of Grain and Oil Crops in South China, Hunan Agricultural University, Changsha 410128, PR China.
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13
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Tsai KP, Uzun H, Chen H, Karanfil T, Chow AT. Control wildfire-induced Microcystis aeruginosa blooms by copper sulfate: Trade-offs between reducing algal organic matter and promoting disinfection byproduct formation. WATER RESEARCH 2019; 158:227-236. [PMID: 31039452 DOI: 10.1016/j.watres.2019.04.013] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 04/05/2019] [Accepted: 04/07/2019] [Indexed: 06/09/2023]
Abstract
Elevated levels of nutrients due to wildfire ash input into stream waters will likely cause algal blooms. When source water is impeded by algae and requires immediate restoration, copper algaecides are usually applied. Previous studies indicate that Cu2+ can promote reactivity of dissolved organic matter in forming disinfection byproducts (DBPs). However, it is unclear that how DBP formation is changed after the treatment of post-fire algal bloom by copper algaecide. In this study Microcystis aeruginosa was cultured in the medium containing black and white ash water extracts (BE and WE) to study DBP concentrations before and after 4-days exposures to low and high copper sulfate (0.5 and 1.0 mg-Cu/L). Dissolved organic matter (DOM) was characterized by UV-VIS absorption and fluorescence spectroscopy and chlorination/chloramination-based DBP formation potential (FP) experiments. DOM concentrations and algal population in the treatments were lower than that in control, regardless of types of water extract. N-nitrosodimethylamine FP in the treatments were 4-6 times higher than the control (0.23-0.34 vs. 0.05-0.06 μg/L), while haloacetonitrile FP revealed no significant difference (132-191 vs. 167-185 μg/L). Trade-offs between reducing algal population and promoting DBP-FP were more pronounced for the solutions containing BE than WE. Low copper concentration was as effective as high concentration in inhibiting algal growth while minimizing promotion of DBP formation. The results can serve to support risk evaluations of algal population and DBP concentration when wildfire-induced algal bloom is left untreated and treated by copper algaecides.
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Affiliation(s)
- Kuo-Pei Tsai
- Biogeochemistry & Environmental Quality Research Group, Clemson University, South Carolina, 29440, USA; Department of Agricultural Chemistry, National Taiwan University, Taipei, 10617, Taiwan
| | - Habibullah Uzun
- Department of Environmental Engineering, Marmara University, Istanbul, 34722, Turkey; Department of Environmental Engineering and Earth Sciences, Clemson University, South Carolina, 29634, USA
| | - Huan Chen
- Biogeochemistry & Environmental Quality Research Group, Clemson University, South Carolina, 29440, USA
| | - Tanju Karanfil
- Department of Environmental Engineering and Earth Sciences, Clemson University, South Carolina, 29634, USA
| | - Alex T Chow
- Biogeochemistry & Environmental Quality Research Group, Clemson University, South Carolina, 29440, USA; Department of Environmental Engineering and Earth Sciences, Clemson University, South Carolina, 29634, USA.
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Mao Y, Ai H, Chen Y, Zhang Z, Zeng P, Kang L, Li W, Gu W, He Q, Li H. Phytoplankton response to polystyrene microplastics: Perspective from an entire growth period. CHEMOSPHERE 2018; 208:59-68. [PMID: 29860145 DOI: 10.1016/j.chemosphere.2018.05.170] [Citation(s) in RCA: 335] [Impact Index Per Article: 55.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Revised: 05/22/2018] [Accepted: 05/27/2018] [Indexed: 06/08/2023]
Abstract
Microplastics are widely identified in aquatic environments, but their impacts on phytoplankton have not been extensively studied. Here, the responses of Chlorella pyrenoidosa under polystyrene (PS) microplastics exposure were studied across its whole growth period, with microplastic sizes of 0.1 and 1.0 μm and 3 concentration gradients each, which covered (10 and 50 mg/L) and exceeded (100 mg/L) its environmental concentrations, respectively. PS microplastics caused dose-dependent adverse effects on Chlorella pyrenoidosa growth from the lag to the earlier logarithmic phases, but exhibited slight difference in the maximal inhibition ratio (approximately 38%) with respect to the two microplastic sizes. In addition to the reduced photosynthetic activity of Chlorella pyrenoidosa, unclear pyrenoids, distorted thylakoids and damaged cell membrane were observed, attributing to the physical damage and oxidative stress caused by microplastics. However, from the end of the logarithmic to the stationary phase, Chlorella pyrenoidosa could reduce the adverse effects of microplastics jointly through cell wall thickening, algae homo-aggregation and algae-microplastics hetero-aggregation, hence triggering an increase of algal photosynthetic activity and its growth, and cell structures turned to normal. Our study confirmed that PS microplastics can impair but then enhance algae growth, which will be helpful in understanding the ecological risks of microplastics.
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Affiliation(s)
- Yufeng Mao
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China
| | - Hainan Ai
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China
| | - Yi Chen
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China
| | - Zhenyu Zhang
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China; School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Peng Zeng
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China
| | - Li Kang
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China
| | - Wei Li
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China
| | - Weikang Gu
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China
| | - Qiang He
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China.
| | - Hong Li
- Key Laboratory of Eco-Environment of Three Gorges Region, Ministry of Education, Chongqing University, Chongqing 400044, China.
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15
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Rahman A, El Hayek E, Blake JM, Bixby RJ, Ali AM, Spilde M, Otieno AA, Miltenberger K, Ridgeway C, Artyushkova K, Atudorei V, Cerrato JM. Metal Reactivity in Laboratory Burned Wood from a Watershed Affected by Wildfires. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:8115-8123. [PMID: 30020776 DOI: 10.1021/acs.est.8b00530] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We investigated interfacial processes affecting metal mobility by wood ash under laboratory-controlled conditions using aqueous chemistry, microscopy, and spectroscopy. The Valles Caldera National Preserve in New Mexico experiences catastrophic wildfires of devastating effects. Wood samples of Ponderosa Pine, Colorado Blue Spruce, and Quaking Aspen collected from this site were exposed to temperatures of 60, 350, and 550 °C. The 350 °C Pine ash had the highest content of Cu (4997 ± 262 mg kg-1), Cr (543 ± 124 mg kg-1), and labile dissolved organic carbon (DOC, 11.3 ± 0.28 mg L-1). Sorption experiments were conducted by reacting 350 °C Pine, Spruce, and Aspen ashes separately with 10 μM Cu(II) and Cr(VI) solutions. Up to a 94% decrease in Cu(II) concentration was observed in solution while Cr(VI) concentration showed a limited decrease (up to 13%) after 180 min of reaction. X-ray photoelectron spectroscopy (XPS) analyses detected increased association of Cu(II) on the near surface region of the reacted 350 °C Pine ash from the sorption experiments compared to the unreacted ash. The results suggest that dissolution and sorption processes should be considered to better understand the potential effects of metals transported by wood ash on water quality that have important implications for postfire recovery and response strategies.
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Affiliation(s)
- Asifur Rahman
- Department of Civil Engineering, MSC01 1070 , University of New Mexico , Albuquerque , New Mexico 87131 , United States
| | - Eliane El Hayek
- Department of Chemistry, MSC03 2060 , University of New Mexico , Albuquerque , New Mexico 87131 , United States
| | - Johanna M Blake
- U.S. Geological Survey , 6700 Edith Blvd. NE , Albuquerque , New Mexico 87113 , United States
| | - Rebecca J Bixby
- Department of Biology and Museum of Southwestern Biology, MSC03 2020 , University of New Mexico , Albuquerque , New Mexico 87131 , United States
| | - Abdul-Mehdi Ali
- Department of Earth and Planetary Sciences, MSC03 2040 , University of New Mexico , Albuquerque , New Mexico 87131 , United States
| | - Michael Spilde
- Department of Earth and Planetary Sciences, MSC03 2040 , University of New Mexico , Albuquerque , New Mexico 87131 , United States
| | - Amanda A Otieno
- Water Resources Program, MSC05 3110 , University of New Mexico , Albuquerque , New Mexico 87131 , United States
| | - Keely Miltenberger
- Department of Earth and Planetary Sciences, MSC03 2040 , University of New Mexico , Albuquerque , New Mexico 87131 , United States
| | - Cyrena Ridgeway
- Department of Civil Engineering , New Mexico State University , Las Cruces , New Mexico 88001 , United States
| | - Kateryna Artyushkova
- Department of Chemical and Biological Engineering, MSC01 1120 , University of New Mexico , Albuquerque , New Mexico 87131 , United States
| | - Viorel Atudorei
- Department of Earth and Planetary Sciences, MSC03 2040 , University of New Mexico , Albuquerque , New Mexico 87131 , United States
| | - José M Cerrato
- Department of Civil Engineering, MSC01 1070 , University of New Mexico , Albuquerque , New Mexico 87131 , United States
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