Pb pollution from land-based sources in adjacent region of Jiaozhou Bay

Based on investigation dada on lead (Pb) in July, August and October 1984 in Jiaozhou Bay waters, we analyzed the content, pollution level and distribution of Pb, and defined the major sources of Pb. Results showed that Pb contents in 1984 in surface waters were 0.72-36.00 μg L -1 and were meeting Grade I to Grade IV in National Sea Water Quality Standard (GB 3097-1997). We found that river flow and overland runoff were the major sources of Pb. The Pb pollution level in river flow was light and moderate polluted, while in ovrland runoff was heavy polluted. In generatlly, land-based sources in adjacent region were the major sources of Pb in Jiaozhou Bay in 1984, and the source-control/reduction of Pb was necessary.