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Based on investigation data on Cu in bottom waters in Jiaozhou Bay in July and October 1984, we analyzed the content, pollution source and sedimentation process of Cu. Results showed that Cu contents in bottom waters were in July and October 1984 were 0.13-2.97 μg L -1 and 0.40-0.61 μg L -1 , respectively, and were meeting Grade I in National Sea Water Quality Standard (GB 3097-1997). There were high sedimentation regions in different positions due to different pollution sources. The major Cu source was stream flow in July, and the high sedimentation rate region was in the bay mouth; while marine current was the major Cu source in October, and the high sedimentation rate region was in the outside of the bay mouth. In generally, due to the different Cu sources and by means of vertical water's effect, there were different high sedimentation rate regions of Cu in Jiaozhou Bay.

Different sources and high sedimentation rate regions of Cu in Jiaozhou Bay