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This paper analyzed the content, distribution, source and background level of Cu in Jiaozhou Bay and the open sea based on investigation data in 1985. Results showed that the Cu contents in surface waters ranged from 0.10-0.43 μg L -1 , and were meeting Grade I in Chinese Sea Water Quality Standard, indicated that Jiaozhou Bay and the open sea had not been polluted by Cu in 1985. Stream flow and marine current were the two major Cu sources, whose source strengths were 0.37-0.43 μg L -1 and 0.39 μg L -1 , respectively. The level of Cu contents in the sea waters were mainly impacted by Cu flux of the inflow streams. The background value of Cu in open sea waters was 0.39 μg L -1 , while for bay waters was 0.10-0.22 μg L -1 . We hold the opinion that Cu in sea is

Background level of Cu in Jiaozhou Bay and open sea