The temporal distribution of organochlorine pesticides (OCPs) was examined in the 210Pb dated sediment core from the Beibu Gulf, South China Sea. The total OCPs concentrations were in the range of 0.93–26.6 ng g−1 dry weight. Dichlorodiphenyltrichloroethanes (DDTs) (0.17–24.8 ng g−1), Hexachlorocyclohexanes (HCHs) (0.04–0.51 ng g−1), Chlordane related compounds (CHLs) (0.22–1.72 ng g−1) and endosulfan (n.d.–0.91 ng g−1) were the predominant compounds. Similar to most Chinese coastal areas, the levels of DDTs in the Beibu Gulf became elevated since the early 1990s, especially since 2000 despite the ban in 1983 in China. This suggests that the concentrations of DDTs were controlled by several processes, such as land reclamation and soil runoff. The isomer ratios of (p,p′-DDE + p,p′-DDD)/p,p′-DDT, p,p′-DDT/DDTs along with construction land expansion indicated that economic activities, land reclamation, soil runoff and the use of DDT-containing antifouling paints might be responsible for the input of DDT. The ratios of α-HCH/γ-HCH (and γ-HCH/HCHs) and trans-chlordane/cis-chlordane (TC/CC) indicated fresh inputs of lindane and chlordane, respectively. In addition, CC was found to be degraded faster than TC under anaerobic conditions in sediments from the Beibu Gulf.
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This work was financial supported by Guangxi Natural Science Foundation (2010GXNSFE013006), NSFC (41273139, 41073104), Major Program of Ministry of Education of China (210161) and Innovation Project of Guangxi Graduate Education (YCSZ2013015).
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Li, P., Wang, Y., Huang, W. et al. Sixty-Year Sedimentary Record of DDTs, HCHs, CHLs and Endosulfan from Emerging Development Gulfs: A Case Study in the Beibu Gulf, South China Sea. Bull Environ Contam Toxicol 92, 23–29 (2014). https://doi.org/10.1007/s00128-013-1130-4
- Sediment core
- Beibu Gulf