花鸟岛贻贝养殖区六六六、滴滴涕和多氯联苯的赋存及健康风险评价

为了探究长江口贻贝养殖区不同介质（水体、土壤与贻贝）中传统持久性有机污染物（POPs）的浓度、组成、介质间分布特征，使用气相质谱联用仪（GC-MS/MS）对水体、土壤和贻贝样品中的六六六（HCHs）、滴滴涕（DDTs）和多氯联苯（PCBs）含量进行测定分析。研究表明：传统POPs在样品中广泛检出，HCHs、DDTs和PCBs在贻贝中含量分别为10.8~49.1、169~900和10.4~34.4 ng/g（脂重），在水体中0.22~1.76、0.07~0.29 ng/L和9.45~51.8 pg/L，在土壤中0.18~10.4、2.62~69.6和0.40~0.69 ng/g (干质量)。DDTs是贻贝中主要的污染化合物。养殖区水体和土壤中目标化合物组成反映其受到污染排放残留影响，贻贝中高氯联苯和滴滴涕降解产物占主导地位，符合生物积累特征。土壤中HCHs、DDTs和PCBs存在很多显著正相关，贻贝同样，这反应了污染物可能存在相似的来源，在主成分分析中可以看出贻贝组织与非生物介质间的关系。健康风险评价表明，人群摄食长江口贻贝几乎不会引起接触风险和致癌风险。本研究可为了解贻贝养殖区传统POPs在介质中的归趋，及人群食用贻贝提供依据。

Occurrence and health risk assessment of HCHs、DDTs and PCBs in the mussel mariculture area of Huaniao Island

Hexachlorobenzene (HCHs), dichlorodiphenyltrichloroethane(DDTs) and poly-chlorinated biphenyls (PCBs) were determined in water, soil and mussel samples using GC-MS/MS, in order to investigate the concentrations, composition and distribution characteristics of legacy persistent organic pollutants (POPs) in different medium in the mussel mariculture area of the Yangtze estuary. The results showed that legacy POPs were widely detected in the samples, and the concentrations of HCHs, DDTs and PCBs ranged from 10.8 to 49.1 , 169 to 900 and 10.4 to 34.4 ng/g(lipid weight) in mussel, 0.22 to 1.76, 0.07 to 0.29 ng/L and 9.45~51.8 pg/L in water, and 0.18 to 10.4, 2.62 to 69.6和0.40 to 0.69 ng/g(dry weight) in soil, respectively. DDTs were the main pollution compounds in mussel. The composition of target compounds in water and soil samples from the mariculture area reflected their exposure to residual pollutant emissions, with a dominance of highly chlorinated PCBs and DDT degradation products in mussels, which was associated with bioaccumulation characteristics. There were many significant positive correlations between HCHs, DDTs and PCBs in soils, as well as in mussels, reflecting the possible existence of similar sources of contaminants. The relationship between mussel tissues and non-biological medium can be seen in the principal component analysis. Health risk assessment showed that population ingestion of local mussels posed little risk of exposure and carcinogenic potential. This study can provide a basis for understanding the fate of legacy POPs among the different medium in the mussel mariculture area and the risk of mussel consumption by the population.