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Based on the investigation data on Cd in waters in Jiaozhou Bay in April, July and Octber 1985, we analyzed the contents, pollution levels, and distributions of Cd. Results showed that Cd contents in Jiaozhou Bay in 1985 were 0.03-0.44 μg L -1 , and were much lower than guide line of Cd in Grade I (1.00 μg L -1 ) of National Sea Water Quality Standard (GB 3097-1997), indicated that the pollution level of Cd in this bay in 1985 was very low. Steam flow was the only source of Cd, whose source strength was 021-0.41 μg L -1 . The horizontal distributions of Cd revealed the effects of tide and marine current of leading Cd contents in waters being homogeneous; particularly in case of Cd contents were low in waters. Furthermore, we proposed 'homogeneous law of substances in waters'.

Homogeneity of Cd contents in Jiaozhou Bay waters