Based on investigation dada on Cadmium (Cd) in bottom waters in Jiaozhou Bay in 1982, this paper analyzed the vertical distribution and seasonal variation of Cd. Results showed that The contents of Cd ranged from 0.13-0.53 μg.L-1, which were meeting Grade I (1.00 μg.L-1) in National Sea Water Quality Standard (GB 3097-1997). Cd contents in different seasons were in order of autumn > spring > summer. By means of vertical sedimentation, Cd contents in surface waters were closed to in bottom waters in different seasons. The distribution trends in surface and bottom waters were same in wet season, while were inverse in dry season.
This paper analyzed the vertical distribution and seasonal variations of Zn in waters of Jiaozhou Bay, Shandong Province, eastern China. Results showed that the Zn contents in Jiaozhou Bay waters were highest in spring and then decreasing from summer to autumn. There was an accumulation process of Zn in land surface in winter, and the ice and snow thaw as well as in increasing of rainfall runoff in spring leading to the increasing of the input of Zn to the bay. By processes of sedimentation and diffusion, Zn was continually depositing to the sea bottoms, and was decreasing from the pollution sources. Finally, we conclude that the Zn contents in the bay waters were mainly determined by the accumulation of Zn in land surface in winter, and the migration of Zn in bay waters were mainly determined by vertical sedimentation and water exchange.
This paper analyzed the input and transfer processes of Cu in waters of Jiaozhou Bay, Shandong Province, eastern China. Results showed that the input of Cu was stream flow discharge and atmospheric deposition; while the major transfer processes of Cu was vertical sedimentation and horizontal diffusion. For seasonal variations, the Cu contents in Jiaozhou Bay were higher in wet season than in dry season. For spatial variation, the Cu contents were higher in surface water than in bottom waters, and were decreasing from the pollution sources to the around areas.
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