黄河入海口沉积物中有机氯农药的垂直分布特征

DA Chunnian1,LIU guijian2,LlU Houqi 2,WU Yang1,YUAN Zijiao2

采用GC-MS内标法和^(210)Pb同位素定年法探讨了黄河入海口沉积柱中有机氯农药的含量和垂直分布特征,建立了有机氯农药的沉积污染历史记录,为黄河入海口生态系统的保护提供基础数据.研究结果表明:ΣHCHs(六六六)和ΣDDTs(滴滴涕)的质量分数范围分别是0.001~14.85ng·g^(-1)和0.04~1.07ng·g^(-1).HCHs含量从1925年开始一直增加,在1961年出现峰值,随后逐渐下降,在1988年再次出现峰值.研究表明HCHs在1961年的峰值与60年代中国开始大量使用HCHs相关,在1988年的峰值与中国使用林丹的历史时间吻合.DDTs含量从1925年到50年代早期略有增加,到60年代早期急剧增加,在沉积柱的表层DDTs含量经过几次波动后大幅度减少.DDTs含量的第一峰值发生在1964年,另一个高峰值在1990年,分析表明DDTs的历史使用量影响着沉积柱中DDTs的残留量.对比中国其他区域,黄河入海口沉积物中HCHs的垂直平均含量接近太湖,略低于珠江口,但高于泉州湾和三亚湾,DDTs的垂直平均含量比珠江口、大亚湾、泉州湾、三亚湾都低.

GC-MS internal standard and ^(210)Pb isotopic dating methods were used to discuss the content andvertical distribution characteristics of organochlorine pesticides in the sediment core from the Yellow River Estuary.The historical records of the pollution of organicchlorine pesticides were established to provide basic data for the protection of the ecological system of the Yellow River Estuary.The results show that the mass froutions ofΣDDTs andΣHCHs in the sediment core are 0.001~14.85ng·g^(-1) and 0.04~1.07ng·g^(-1),respectively.Contents had been increasing since 1925,peaking in 1961,and then decreased gradually.The first peak of the content of HCHs in the sediment core came in the early 1960 s.This peak is associated with the history of HCHs in 1960 sin China.The second peak of the content of HCHs in the sediment core occurred in 1988,and is associated with the history of lindane in 1988 in China.The content of DDTs increased slightly from 1925 to 1950s,and sharply in the early 1960 s,and the content of DDTs in the surface of the sedimentary column decreased significantly after several fluctuations.The first peak of the DDTs content in the sediment core occurred in 1964,and the second peak of DDTs in the sediment core is in 1990.The amount of DDTs used over time affected the residue in the sediment core.Compared with the other estuarine and coastal regions in Chinese rivers,the vertical average content of HCHs in the sediments of the Yellow River Estuary is close to that of Taihu,which is slightly lower than that of the Pearl River Estuary,but higher than that of the Quanzhou Bay and the Gulf of Sanya.The vertical average content of DDTs is lower than that of the Pearl River Estuary,Quanzhou,Dayawan Bay and Sanya Bay.