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Thirty-five surface sediment samples collected from Beibu Gulf and its tributary rivers, China were analyzed for DDTs, HCHs and chlordanes. Total concentrations of DDTs, HCHs and chlordanes in sediments ranged from 0.59 to 126ngg −1 , ND to 2.65ngg −1 and 0.27 to 3.41ngg −1 based on dry weight (dw), respectively. Concentrations of DDTs were higher than those...
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