Historical deposition behaviors of organochlorine pesticides (OCPs) in the sediments of a shallow eutrophic lake in Eastern China: Roles of the sources and sedimentological conditions |
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| Institution: | 1. Institute of Hydrobiology, Chinese Academy of Sciences, 430072, People''s Republic of China;2. University of Chinese Academy of Sciences, 100039, People''s Republic of China;3. School of Environmental Studies, China University of Geosciences, Wuhan, 430074, People''s Republic of China;1. State Key Laboratory of Biogeology and Environmental Geology, School of Environmental Studies, China University of Geosciences, Wuhan 430074, China;2. Dipartimento di Scienze della Terra, dell''Ambiente e delle Risorse, Università degli Studi di Napoli “Federico II”, Via Mezzocannone 8, 80134, Naples, Italy;3. School of Environmental Science and Engineering, Hubei Polytechnic University, Huangshi 435003, China;4. Lancaster Environment Centre, Lancaster University, Lancaster, Lancashire LA1 4YQ, UK;5. Fujian Institute of Geological Survey, Fuzhou 350013, China;1. Sustainable Development Study Centre, Government College University, Lahore 54000, Pakistan;2. College of Earth and Environmental Sciences, University of the Punjab, Lahore (54590), Pakistan;3. Department of Environmental Sciences, Government College Women University, Sialkot (51310), Pakistan;4. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China |
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| Abstract: | Organochlorine pesticides (OCPs) were quantified in sediments from Lake Chaohu, a shallow eutrophic lake in Eastern China, to investigate their historical deposition behaviors and to reconstruct their use history. The OCP concentrations ranged from 2.17 to 18.61 ng g?1 in the surface sediments in the lake region and from .28 to 86.27 ng g?1 in the inflowing river. The highest values of the aforementioned variables were attributed to urban-industrial pollution sources in the west lake region and decreased with distance from the river inlets. Historically, OCP contamination displayed three stages in Lake Chaohu: an initial increase before the 1930s, a sharp increase until the 1980s, and a decrease due the implementation of policies banning their use in the 1980s. During the second stage, the OCP concentrations increased rapidly from .69, .58, 1.95 and .02 ng g?1 in the C4, C5, C6 and C10 samples in the 1930s to 8.68, 61.89, 24.14 and 3.53 ng g?1, respectively, in the early 1980s. This temporal trend of OCP concentrations corresponded with historically intense anthropogenic activities, indicating that contamination by OCPs was accompanied by industrialization and civilization prior to their prohibition. In addition, dichlorodiphenyltrichloroethane (DDT) contamination was derived from the historical use of technical DDTs, whereas hexachlorocyclohexane (BHC) contamination was attributed to the historical use of technical BHCs with Lindane and new inputs of illegal DDTs. Strong positive relationships between the OCP concentrations and the total organic carbon (TOC) concentrations, sediment grain sizes (<4 μm), nutrient contents and heavy metal contents indicated that the sedimentary conditions and human activities affected the depositional characteristics of the OCPs. The DDT residues and their metabolites, particularly those in the inlet rivers, should be of concern because they result in an ecotoxicological risk in the catchment of Lake Chaohu. |
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| Keywords: | Organochlorine pesticides (OCPs) Historical records Sedimentological condition Anthropogenic activities |
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