Marine organic pollution history in the Changjiang Estuary and Zhejiang coastal area--HCHs and DDTs stratigraphical records.
The variations of concentrations of hexachloro-cyclohexane (HCHs), dichloro diphenyl trichloroethane (DDTs) in surface sediments from the Changjiang Estuary and Zhejiang coastal area suggests that although there is a substantial decrease of these persistent trace compounds since the last two decades, they still presented in recent surface sediments. Their concentration levels in suspended matter are still quite high. In dated sedimentary cores, the DDTs and HCHs concentration peaks appeared in 1960s to 1980s, which approximately corresponded to their production and usage history.
Chen
Jian-fang
JF
Key Laboratory of Submarine Geosciences, Second Institute of Oceanography, State Oceanic Administration, Hangzhou, China. jfchen@mail.hz.zj.cn
Xia
Xiao-ming
XM
Ye
Xin-rong
XR
Jin
Hai-yan
HY
D002681:China; D003634:DDT / Q000032:analysis* / Q000266:history; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D001556:Hexachlorocyclohexane / Q000032:analysis* / Q000266:history; D049673:History, 20th Century; D007306:Insecticides / Q000032:analysis* / Q000266:history; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000266:history; D014876:Water Pollution / Q000266:history*
D007306:Insecticides; D014874:Water Pollutants, Chemical; D001556:Hexachlorocyclohexane; D003634:DDT