Multiple sources and unique high sedimentation location of Hg in Jiaozhou Bay

This paper analyzed the contents and distributions of Hg in bottom waters Jiaozhou Bay in 1988, and tried to reveal the vertical migration processes. Results showed that Hg contents in bottom waters were 0.024-0.128 μg L^-1, and were conformed with Grade I to II, indicated that the pollution level of Pb was still slight in 1988. There were multiple Hg sources around the bay, yet was only one high sedimentation location in the center of the bay. The reason was that the terrestrial P sources discharged into the coastal waters of the bay could be transferred to the center of the bay by means of falling tide. Furthermore, Hg contents would be decreasing while passing through the bay mouth, no matter from the inner of the bay to the open waters or from the open waters to the inner of the bay. In general, there may be unique high sedimentation location of substance even if in case of multiple sources, and substance contents would be decreasing gradiently during transferring process through the bay mouth.