Aggregation and divergent process of As in the bay mouth of Jiaozhou Bay

This paper analyzed the content and distribution of Arsenic (As) in bottom waters in the bay mouth of Jiaozhou Bay in May, September and October 1983.Results showed As contents ranged from 0.15-2.30μg L -1 in bottom waters in the whole year, and were more lower than Class I for As (20.00 μg L -1 ) in National Standard of China for Seawater Quality (GB3097-1997).Jiaozhou Bay was very slightly contaminated by As in 1983 by means of vertical water's effect.In according to the horizontal distributions of As in the bay mouth, there was a high value region in May (1.74 μg L -1 ) in the bay mouth, while in September and October were low value regions (0.15-0.44 μg L -1 ).There were both aggreation and divergent processes of As in the bay mouth, whose preconditions were both concave submarine landform and high flow rate, and whose decisive conditions were high contents of low contents of As in surface waters, respectively.