High sedimentation regions and laws of As in Jiaozhou Bay

Using investigation data on Arsenic (As) in bottom waters in Jiaozhou Bay in April and August 1981, this paper researched the contents and horizontal distributions of As in bottom waters. Results showed that As contents in April and August 1981 were 1.04-2.40 μg L -1 and 1.00-1.80 μg L -1 , respectively. The contents of As in bottom waters Jiaozhou Bay 1981 was very slight and confirmed to Class I in Sea Water Quality Standard (GB 3097-1997). High As contents regions were in the coastal waters in the east, northeast, and north of the bay. The terrestrial As sources were 2.00-2.70 μg L -1 , and resulted in relevant high sedimentation regions. In April 1981, high sedimentation region was in bottom waters in the estuary of Haibo River (2.40 μg L -1 ). In August 1981, high sedimentation region was in bottom waters in coastal waters in the northeast of the bay (1.80 μg L -1 ). We found the law of high sedimentation as different sources result in different high sedimentation regions. Furthermore, in bottom waters in the bay mouth, and at any time, substance contents are decreasing while passing through the bay mouth.