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Organochlorine pesticides in sediments of Laizhou Bay and its adjacent rivers, North China |
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| Authors: | Zhong Guangcai Tang Jianhui Zhao Zhen Pan Xiaohui Chen Yingjun Li Jun Zhang Gan |
| Institution: | a Key Laboratory of Coastal Zone Environmental Processes, Yantai Institute of Coastal Zone Research, CAS, Yantai 264003, China b State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640, China c Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
| Abstract: | Organochlorine pesticides (HCHs, DDTs and HCB) have been investigated in sediments of Laizhou Bay and its adjacent rivers. The average concentrations of HCHs, DDTs and HCBs are 0.09 ng/g dw, 0.59 and 0.05 for marine sediments and 0.55, 8.6 and 1.1 for riverine sediments, respectively. Laizhou Bay is less contaminated by HCHs and DDTs in comparison with other coastal regions around the world, including the other two biggest bays in Bohai Sea. Fresh input of lindane and dicofol-type DDT were found in several riverine sites. Relatively strong TOC-dependence of HCB distribution in the entire studied area suggested no point source existed and/or water-sediment equilibrium achieved. No significant difference of α/γ-HCH ratios have been observed between marine and riverine sediments. However, o,p′-DDT/p,p′-DDT ratios varied largely between the two regions. |
| Keywords: | Bohai Sea Laizhou Bay Organochlorine pesticides DDTs Sediments |
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