The Trace Input of Cyanide to Jiaozhou Bay

This paper analyzed the content, pollution level, pollution source and input of cyanide in Jiaozhou Bay 1983. Results showed that cyanide contents in surface waters were 0.02-0.46 μg L -1 , which were much lower than the guide line of cyanide in Grade I (5.00 μg L -1 ) of National Sea Water Quality Standard (GB 3097-1997), indicating that this bay was very slight polluted by cyanide in 1983. In according to the spatial distribution of cyanide, we found that river flow and marine terminals were the major sources, whose input strengths were 0.14-0.46 μg L -1 and 0.42 μg L -1 , respectively. Cyanide in Jiaozhou Bay was mainly generated by human activities, and source-management was essential to environmental controls in Jiaozhou Bay.