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This paper analyzed the seasonal variation, horizontal distribution, vertical distribution and variation range of Chromium (Cr) in the bay mouth of Jiaozhou Bay based on investigation data in 1983. Results showed that Cr contents in different seasons in both surface and bottom waters were in order of spring < summer < autumn. The input of Cr from stream flow discharge in determined the change of the variation of Cr content in both surface and bottom waters. From May, September and October, as time passed by, Cr contents and horizontal distributions in bottom waters were tending to be consistent with that in surface waters. Moreover, there was always a big high Cr content region in bottom waters in the bay mouth in different seasons.

Vertical distribution and settling pool of Chromium in the bay mouth of Jiaozhou Bay