International Joint Research Center for Persistent Toxic Substances, Zhejiang University of Technology, Hangzhou, China.
J Environ Sci Health B. 2011;46(2):105-11. doi: 10.1080/03601234.2011.534967.
Residual levels and enantiomeric signatures of hexachlorocyclohexanes (HCHs) and dichlorodiphenyltrichloroethanes (DDTs) in surface sediments from Xiangshan Bay, East China Sea were investigated. The concentrations of ∑HCHs (sums of α-, β-, γ-, and δ-HCH) and ∑DDTs (sums of p, p'-DDT, p, p'-DDD,p, p'-DDE, o, p'-DDT, and o, p'-DDD) ranged from 0.14 to 0.67 ng g⁻¹ and 0.61 to 22.38 ng g⁻¹, respectively. A slight potential health risk to the organism was then indicated for the residual levels of DDTs according to the ERL/ERM guidelines. Moreover, the predominant β-HCH implied that the technical HCH contamination was mainly due to the historical usage. But the high ratio of DDT/∑DDTs depicted a cocktail input pattern of fresh and weathered DDTs. The enantiomeric fractions (EFs) of α-HCH, o, p'-DDT, and o, p'-DDD were also determined. The degradation of α-HCH was enantioselective in all sediments samples, resulting in an enrichment of (-)-enantiomers. However, the racemic residues of o, p'-DDT and o, p'-DDD were observed in all sediments samples.
本研究调查了东海象山湾表层沉积物中六六六（HCHs）和滴滴涕（DDTs）的残留水平和对映体特征。∑HCHs（α-、β-、γ-和 δ-HCH 的总和）和∑DDTs（p, p'-DDT、p, p'-DDD、p, p'-DDE、o, p'-DDT 和 o, p'-DDD 的总和）的浓度范围分别为 0.14 至 0.67ng/g 和 0.61 至 22.38ng/g。根据 ERL/ERM 指南，DDTs 的残留水平表明对生物体存在轻微的潜在健康风险。此外，β-HCH 的优势表明技术 HCH 污染主要是由于历史用途造成的。但是，DDT/∑DDTs 的高比值描绘了新鲜和风化 DDT 的混合输入模式。还确定了 α-HCH、o, p'-DDT 和 o, p'-DDD 的对映体分数（EFs）。所有沉积物样品中 α-HCH 的降解均具有对映选择性，导致（-）-对映体富集。然而，所有沉积物样品中均观察到 o, p'-DDT 和 o, p'-DDD 的外消旋残留物。
