DDTs和HCHs在珠江口南部海域管角螺的组织分布及生物转化  

Distribution and biotransformation of DDTs and HCHs in Hemifusus tuba from the southern Pearl River Estuary

作　　者：田磊[1,2] 张大文[1] 黄小平[1] 

机构地区：[1]中国科学院南海海洋研究所热带海洋环境动力学重点实验室,广州510301 [2]中国科学院研究生院,北京100049

出　　处：《生态学杂志》2011年第1期12-17,共6页Chinese Journal of Ecology

基　　金：中国科学院知识创新工程重要方向性项目(KZCXZ-YW-Q07);908专项(GD908-01-03;GD908-02-02);国家自然科学基金项目(41076069;40776086)资助

摘　　要：通过测定珠江口海域典型腹足类管角螺(Hemifusus tuba)各组织器官中DDTs和HCHs的含量,研究了管角螺体内DDTs和HCHs的组织分布和生物转化规律。结果表明:管角螺肠中DDTs和HCHs含量远高于其他器官,表明其肠壁对有机氯农药有一定的屏蔽作用;性腺中检出较高浓度的DDTs和HCHs,表明性腺是DDTs和HCHs重要的累积器官;各组织器官中的(DDE+DDD)/p,p′-DDT比值(3.20～7.53)均高于沉积物(1.23),说明管角螺具有较强的降解DDT能力;腮中这一比值高于其他各器官,表明腮可能是管角螺排泄DDTs的潜在器官;β-HCH是HCHs各器官中的主要存在形式(63.88%～88.99%),表明生物体可以高效地将α-HCH降解为β-HCH;管角螺肌肉组织中DDTs和HCHs的含量虽未超过WHO规定的食用安全标准,但有机氯农药沿食物链放大对人类健康的潜在危害需重点关注。Based on the measurements of DDTs and HCHs concentrations in various tissues of Hemifusus tuba from the southern Pearl River Estuary, the distribution and biotransformation of the two organoehlorine pesticides （OCPs） in this marine gastropod were examined. The DDTs and HCHs concentrations in H. tuba intestine were much higher than those in other tissues, suggesting that the intestinal wall of H. tuba was an important barrier to DDTs and HCHs. The higher DDTs and HCHs concentrations in H. tuba gonad suggested that the gonad was an important site for the accumulation of DDTs and HCHs. The （DDE＋DDD）/p,p＇-DDT ratio in various H. tuba tissues （3.20-7.53） was much higher than that in sediment （ 1.23）, indicating that H. tuba had stronger capability to metabolize DDT. The highest （DDE＋DDD）/p,p＇-DDT ratio was found in gill, suggesting that gill could play an important role in excreting the DDT metabolites （DDD and DDE） in H. tuba. Among the HCHs in all H. tuba tissues, β-HCH was the most persistent HCH isomer （63.88% -88.99% ）, implying that H. tuba was able to efficiently degrade α-HCH to β-HCH. Though the DDTs and HCHs concentrations in H. tuba muscles did not exceed the tolerable daily intake standard proposed by the WHO, more attention should be paid to the potential risks of OCPs biomagnification along food chain to human health.

关 键 词：有机氯农药 海洋腹足类 累积 生物转化 珠江口南部海域 

分 类 号：X592[环境科学与工程—环境工程]