广东沿海近江牡蛎氯代烃和石油烃含量分布与变化趋势

Distributions and change tendencies of chlorinated hydrocarbons and petroleum hydrocarbons in bivalves from Guangdong coast

根据历史调查资料和近年的观测数据,比较了广东沿海近江牡蛎Crassostrearivularis体中氯代烃和石油烃含量的地理分布与时间变化。2003年牡蛎体中六六六、滴滴涕、多氯联苯平均含量(湿重)分别为0.469、3.40和45.1ng·g-1,地理分布为粤东岸段>粤西岸段>珠江口。1989年以来六六六、多氯联苯含量呈持续下降趋势,滴滴涕含量在1989—1993年呈下降趋势,但在2003年明显反弹。牡蛎体中石油烃年平均含量1989年以来有一定的波动,2003年为4.75μg·g-1(湿重,大港原油当量),地理分布为珠江口>粤东岸段>粤西岸段。

Based on historical data and recent survey data, this paper studied the geographical distributions and change tendencies of contents （ wet weight, arithmetic mean ） of chlorinated hydrocarbons and total petroleum hydrocarbons （ TPHs ） in the bivalves collected along Guangdong coast. The contents of benzene hexachlorides （BHCs）, dichloradiphenyl triehloroethanes （DDTs）, and polychlorinated biphenyls （PCBs） in the oysters （Crassostrea rivularis） were 0. 469, 3.40, and 45. lng·g^-1 respectively in 2003, in order of East Guangdong coast, West Guangdong coast, Zhujiang River estuary from high to low. The contents of BHCs and PCBs had continously decreased since 1989, and the contents of DDTs trended toi wards decrease from 1989 to 1993, but rebounded in 2003. The contents of TPHs had fluctuated since 1989, and the mean content along Guangdong coast was 4.75μg·g^-1 （ wet weight, Dagang crude oil equation ） in 2003, in order of Zhujiang River estuary, East Guangdong coast, West Guangdong coast from high to low.