We analyzed the contents, horizontal distributions and pollution sources of Cu in Jiaozhou Bay, Shandong Province, China in 1984. Results showed that Cu contents in surface waters in July, August and October 1984 were 0.28-1.88 μg L~(-1), 1.60-4.00 μg L~(-1) and 0.11-2.00 μg L~(-1), respectively, and were confirmed with Grade I (5.00 μg L~(-1)) in Chinese Sea Water Quality Standard (GB 3097-1997). The major sources of Cu were river flow and ocean current, whose source strengths were 1.88-4.00 μg L~(-1) and 2.00 μg L~(-1), respectively. The source strengths and pollution levels of Cu in Jiaozhou Bay were very weak and low in 1984. These founding were helpful to understanding the background level of Cu in the early stage of reform and opening up, as well as the research on the existence of Cu.
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