期刊
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
卷 18, 期 21, 页码 -出版社
MDPI
DOI: 10.3390/ijerph182111589
关键词
illegal use; non-point source pollution; agricultural use; veterinary use; Three Gorges
资金
- National Key Research and Development Program [2019YFC1805502]
- National Natural Science Foundation of China [41907327, 42007178]
- Natural Science Foundation of Hubei [2019CFB372, 2020CFB463]
- State Key Laboratory of Organic Geochemistry [SKLOG202008]
- Guangxi Key Science and Technology Innovation Base on Karst Dynamics [202002]
- China Geological Survey [DD20190824]
- Fundamental Research Funds for the Central Universities [CUG 190644, CUGL180817]
- Hubei Provincial Engineering Research Center of Systematic Water Pollution Control [20190814]
- Hubei Key Laboratory of Environmental Water Science in the Yangtze River Basin
Excessive reclamation and improper agrochemical use in karst areas can lead to serious non-point source pollution, contaminating groundwater. The study investigated organochlorine pesticides (OCPs) in karst soils near the Three Gorges Dam in China, showing illegal uses of OCPs and bioaccumulation effects through the food chain. Composition analysis and principal component analysis were used to identify sources and spatial distributions of OCPs.
Excessive reclamation and improper use of agrochemicals in karst areas leads to serious non-point source pollution, which is of great concern and needs to be controlled, since contaminants can easily pollute groundwater due to the thin patchy soil and developed karst structures. The occurrences of organochlorine pesticides (OCPs) in karst soil were investigated by analyzing 25 OCPs in the karst soils near the Three Gorges Dam, China. The total concentrations of OCPs ranged 161-43,100 (6410 & PLUSMN; 9620) pg/g, with the most abundant compounds being p,p & PRIME;-DDT and mirex. The concentration differences between the orchard and vegetable field and between upstream and downstream presented the influences of land-use type and water transport on the OCP spatial distributions. Composition analysis indicated the possible fresh inputs of lindane, technical DDT, aldrin, endrin, mirex, and methoxychlor. Their illegal uses implied an insufficient agrochemical management system in undeveloped karst areas. Principal component analysis with multiple linear regression analysis characterized the dominant sources from current agricultural use and current veterinary use in the study area. OCPs in the soils might not pose significant cancer risk for the residents, but they need to be controlled due to their illegal uses and bioaccumulation effect via the food chain.
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