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  • Title: [Residues of Organochlorine Pesticides (OCPs) in Water and Sediments from Nansha Mangrove Wetland].
    Author: Ding Y, Huang HF, Li H, Luo J, Zheng H, Sun Y, Yang D, Zhang Y, Qi SH.
    Journal: Huan Jing Ke Xue; 2017 Apr 08; 38(4):1431-1441. PubMed ID: 29965144.
    Abstract:
    Mangrove wetland plays an important role in coastal environment. A total of 10 surface water samples and 7 surface sediments samples were collected in March, 2015 from Nansha mangrove wetland, and 8 compounds of organochlorine pesticides (OCPs) were determined by GC-ECD to investigate residues level, source, and ecological risk of these compounds in the study region. The result showed concentrations of OCPs in water ranged from 1.89 to 90.19 ng·L-1 (mean 30.16 ng·L-1), and concentrations of OCPs in sediments varied from 3.10 to 16.02 ng·g-1 (average 8.58 ng·g-1). Compared with other estuaries and harbors around the world, concentrations of OCPs in this study stayed at a median pollution level. The mean values of distribution coefficient of HCHs and DDTs between water and sediments were 857 and 368, respectively. Sediments in some parts of the area, whose distribution coefficient was relatively high, may bring water the secondary pollution. Source analysis indicated that HCHs mainly originated from the application of Lindane, and DDTs originated from mixed sources of dicofol and technical DDT. Compared with OCPs in water, OCPs in sediments might contain more historical residual components. OCPs in water had light ecological risk, but OCPs in sediments posed a potential high risk to mangrove ecosystem.
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