中文摘要：

Based on the investigation data of Jiaozhou Bay waters in 1981, current situation and horizontal distribution of Cr content in bottom waters of Jiaozhou Bay mouth were studied. Results showed that in bottom waters of Jiaozhou Bay center, Cr content changed from 0. 50 to 3.78 mQ/L in April. In August, Cr content changed from 0.14 to 1.42 ng/L in bottom waters of Jiaozhou Bay mouth. It showed that Cr content corresponded with national class-one seawater quality standard (50.00 mQ/L) at different times and spaces, and Cr content was far less than 5.00 Therefore, under the effect of vertical water body, water quality was clean in bottom waters of Jiaozhou Bay, which was not polluted by Cr. In bottom waters of Jiaozhou Bay center in April and bottom waters of Jiaozhou Bay mouth in August, Cr transported by the river came to the bottom layer from surface layer by passing through water body in temporal-spatial change process. Under the effects of gravity and water flow, Cr continuously and quickly sank to the sea bottom. It verified the sedimentation process of Cr content.