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| Assessment of the fate of pesticide non-point source pollution in environmental multimedia of the Yangtze River basin |
| Received:April 02, 2022 |
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| KeyWord:carbofuran;non-point source pollution;environmental multimedia;fugacity model;Yangtze River basin |
| Author Name | Affiliation | E-mail | | YAN Xiaoman | School of Environment, Beijing Normal University, Beijing 100875, China | | | JIAO Cong | School of Environment, Beijing Normal University, Beijing 100875, China | | | CHEN Lei | School of Environment, Beijing Normal University, Beijing 100875, China | chenlei1982bnu@bnu.edu.cn | | ZHANG Qianqian | School of Environment, South China Normal University, Guangzhou 510006, China | | | QI Shasha | CNOOC Research Institute, Beijing 100028, China | | | SHEN Zhenyao | School of Environment, Beijing Normal University, Beijing 100875, China | |
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| Abstract: |
| To study the spatiotemporal distribution of typical pesticide non-point sources in the Yangtze River basin, a multi-medium environmental trend model for large-scale, multi-region, and long-term pesticide non-point source pollution was developed based on fugacity theory. This model was used to quantify the legacy, concentration, and transmission flux of carbofuran in four environmental medias, namely, water, soil, air, and sediment, in the Yangtze River basin from 1991 to 2020. The results showed that the legacy of carbofuran first increased and then decreased, peaking in 2010（1 647 t）. The surface water and soil phases were the main sources of carbofuran, with concentrations ranging from 0.278-135 ng·L-1 and 0.052 2-16.7 ng·g-1, respectively. The middle and lower reaches of the Yangtze River basin are hotspot regions, especially the Ganjiang River basin. Approximately 5.40% of pesticides applied each year remained in the environment, and the main removal method was degradation, followed by advection into the sea（approximately 109 t·a-1 in 2017）. The results implied that the accumulation and transport of pesticide non-point source pollution on a large spatiotemporal scale cannot be ignored. The simulation results of the modified method were more reasonable and provided important data reference and technical support for the scientific control of pesticide non-point source pollution in the Yangtze River basin. |
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