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This paper analyzed the seasonal-temporal variation of Cd in bottom waters in Jiaozhou Bay during 1979-1983. Results showed that for seasonal variation, Cd contents in bottom waters in spring and summer were relatively low and were confirmed to Grade I, while in autumn were relatively high and the highest values of Cd contents were confirmed to Grade II. For temporal variation, the highest values of Cd contents in bottom waters in 1979-1982 were confirmed to Grade I, while in 1983 were Grade II. This indicated that the input of Cd to the bay was different in different seasons, and the time lag of pollution treatment to the development industry could cause environment pollution and ecological damage.

Seasonal-temporal changes of Cd in bottom waters in Jiaozhou Bay