Occurrence, spatial distribution, source, and ecological risk assessment of organochlorine pesticides in Dongting Lake, China
| Autor: | Shaoyong Lu, Zhaozhao Li, Li Linlin, Qi He, Fengmei Cao, Pan Qin |
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| Rok vydání: | 2020 |
| Předmět: |
China
Geologic Sediments Heptachlor Health Toxicology and Mutagenesis 010501 environmental sciences 01 natural sciences Risk Assessment chemistry.chemical_compound Rivers Tributary Hydrocarbons Chlorinated Environmental Chemistry Humans Water cycle Pesticides 0105 earth and related environmental sciences Hydrology geography geography.geographical_feature_category Sediment General Medicine Pollution Lakes chemistry Benthic zone Environmental science Water quality Surface runoff Surface water Water Pollutants Chemical Environmental Monitoring |
| Zdroj: | Environmental science and pollution research international. 28(24) |
| ISSN: | 1614-7499 |
| Popis: | The occurrence, distribution, sources, and ecological risks of organochlorine pesticides in Dongting Lake of China were investigated. The average concentrations of organochlorine pesticides (OCPs) in 22 surface water samples and 14 sediment samples were 90.07 ng/L and 80.65 ng/g dw, respectively. Sixteen types of OCPs, dominated by HCHs, DDTs and heptachlor, were detected in the Dongting Lake. The relationships of OCP residues between Dongting Lake and its tributary rivers have been discussed and the hydraulic connections with the Yangtze River and the Three Gorges Dam (TGD) were also considered. Results showed that the shortage of runoff, earlier dry season, and reduction of sediment deposition extremely deteriorated the hydraulic conditions, magnified the water cycle, and restrained the self-purification of OCPs. The ∑OCPs in surface water were concentrated in the inlets of Yangtze River, Lishui River, Zishui River, Yuanshui River, and Xiangjiang River. Moreover, the ∑OCPs in the outlet of the Yangtze River also maintained a high level, indicating that OCPs posed adverse effects on the Yangtze River. Risk assessments of OCPs in the surface water of Dongting Lake were estimated according to available water quality guidelines and health risk assessment models. The results indicated that OCPs in the surface water of Dongting Lake were safe for aquatic organisms and human health. In addition, sediment quality guidelines (SQGs) were also applied to evaluate the potential ecotoxicological risks of OCPs in sediments. The results presented that contaminants of γ-HCH; o,p′-DDD; and dieldrin in sediment had adverse effects on benthic organisms, indicating that fundamental solutions should be proposed to control OCP contamination in Dongting Lake. |
| Databáze: | OpenAIRE |
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