Abstract
GC-MS internal standard and 210Pb isotopic dating methods were used to discuss the content and vertical 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 of ΣDDTs and ΣHCHs in the sediment core are 0.001~14.85 ng·g-1 and 0.04~1.07 ng·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 1960s. This peak is associated with the history of HCHs in 1960s in 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 1960s, 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.
Abstract
GC-MS internal standard and 210Pb isotopic dating methods were used to discuss the content and vertical 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 of ΣDDTs and ΣHCHs in the sediment core are 0.001~14.85 ng·g-1 and 0.04~1.07 ng·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 1960s. This peak is associated with the history of HCHs in 1960s in 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 1960s, 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.
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