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| Pollution characteristics and ecological risk assessment of organophosphorus pesticides in Huixian wetland water |
| Received:February 22, 2021 |
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| KeyWord:organophosphorus pesticides;Huixian wetland;residual characteristics;spatial-temporal variation;risk assessment |
| Author Name | Affiliation | E-mail | | ZHANG Jianwei | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | | | ZENG Shasha | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | | | LIANG Yanpeng | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China
Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin 541004, China
Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541004, China | ypliang1980@163.com | | QIN Litang | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China
Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin 541004, China | | | ZENG Honghu | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China
Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin 541004, China
Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541004, China | | | MA Chengyou | China Nonferrous Metals(Guilin) Geology and Mining Co., Ltd., Guilin 541004, China | |
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| Abstract: |
| The study aims to investigate the pollution level, temporal and spatial distribution characteristics, and ecological risks of organophosphorus pesticides(OPs) in the water of Guilin Huixian karst wetland. During three different water periods from August 2018 to January 2019, 72 water samples were collected from lakes and farmland ditches in the study area. The content of 16 OPs was analyzed using solid-phase extraction combined with ultra-high performance liquid chromatography-tandem mass spectrometry(UPLC-MS/MS). The ecological risks were assessed using risk entropy methods. The results showed that the residual concentrations of OPs in wetland lakes and farmland ditches were nd~182.590 ng·L-1 and nd~146.636 ng·L-1, respectively, while the average concentrations were 11.633 ng·L-1 and 16.813 ng·L-1, respectively. Omethoate, trichlorfon, and triazophos were the main pollutants, accounting for more than 65% of the total residual concentration. Chlorpyrifos and parathion had the highest detection rates of 55.5% and 44.5% in lakes and farmland ditches, respectively. Regarding time distribution, the OPs residues presented seasonal changes, in the order of high water period> dry period> normal water period. The average concentration in the wet period was 3.73 times and 6.74 times more than in the normal and dry periods, respectively. For spatial distribution, OPs decreased along the water flow direction. The results of the ecological risk assessment of the OPs mixture showed that 27.8% of the water samples had risk quotient(RQ) values greater than 1, indicating high risk; 44.4% had RQ values of 0.1 to 1, indicating medium risk. The high-risk points were mostly concentrated in farmland ditches with frequent agricultural activities during the wet and flat periods, while wetland lakes with less human activities were mostly low-and medium-risk, indicating that the intensity of human activities might be closely related to that of OPs pollution. Studies have shown that OPs in Huixian wetland water bodies have certain ecological risks, and the application and control of OPs should be strengthened in agricultural farming areas that produce medium and high risks. |
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