Horizontal migration process of Pb in bottom waters in Jiaozhou Bay 1989

Abstract

This paper quantified the horizontal migration processes of Plumbum (Pb) in Jiaozhou Bay in 1989. Results showed that Pb contents in bottom waters in April and July 1989 were 8.15-10.10 μg L-1 and 3.39-7.15 μg L-1, respectively. The pollution level of Pb in bottom waters in April and July 1989 could be considered as heavy and moderate, respectively. In April 1989, Pb contents in bottom waters from the bay center to the bay mouth were decreasing from 10.10 μg L-1 to 8.15 μg L-1, indicating that the sedimentation rate was high in the bay center, yet was low in the bay mouth. In July 1989, Pb contents in bottom waters from the bay center to the bay mouth were decreasing from 7.15 μg L-1 to 3.39 μg L-1, also indicating that the sedimentation rate was high in the bay center, yet was low in the bay mouth. By means of source input and the vertical water’s effect, the sedimentation rate in the bay center was high via the rapid vertical sedimentation process. The major source of Pb were river runoff and atmosphere deposition, the sedimentation rate in the bay mouth was low due to the water exchange. By means of the vertical water’s effect and the water exchange process, Pb contents in marine bay were changing continuously.