血吸虫病疫区水生生物体内氯苯化合物的污染特征与潜在风险

采用GC/MS技术对典型血吸虫病疫区不同水期采集的1种软体生物和5种鱼体肌肉进行分析.实验发现3类二氯苯和六氯苯(HCB)为优势污染物.ΣCBs在软体生物肌肉中几何均值(以脂肪质量计,下同)为11 947 ng·g-1;在鱼体肌肉中范围为1 851~8 159 ng·g-1,鱼体ΣCBs最高浓度出现在鲶鱼体内,最低浓度出现在鲫鱼体内;实验结果与国内外相关文献报道值比较,显示该区域软体生物体内HCB含量与其他区域相当;鱼体肌肉中HCB含量则处于较高污染水平.癌症风险评价结果表明因软体生物和鱼类摄入HCB而带来的风险分别为1.49×10-7和3.73~21.1×10-7,说明研究区域水生生物中因HCB污染引起的癌症风险处于可接受水平.

Distribution Characteristics and Potential Risk of CBs in Aquatic Organisms from Typical Epidemic Areas of Schistosomiasis Prevalence

Eleven mollusca samples and 32 fish samples were collected from typical epidemic areas of schistosomiasis prevalence.The contents of 12 CB congeners in aquatic organism samples were measured using the GC/MS technique.The results indicated that 1,3-DIC, 1,4-DIC, 1,2-DIC and HCB were the most predominant CB congeners in the samples from the studying area.The geometric average of CBs in muscle of mollusca was 11947 ng·g^-1 lipid weight.The summarized concentration of CBs in fish muscle ranged from 1851 to 8159 ng·g^-1 lipid weight.The highest concentration of CBs sum was detected in the catfish, while the lowest one was found in the crucian carp.The concentrations of CBs in fish samples were much higher than those reported in other countries, while in mollusca samples were at the same level.The estimated cumulative cancerigenic risks for the local residents consumed the aquatic organisms from the studying area were 1.49×10^-7and 3.73-21.1×10^-7, respectively for mollusca and fish, both of which were acceptable.