Mutual Transformation between Vertical Sediment Amount and Vertical Diluted Amount

Based on the investigation data of Hg in Jiaozhou Bay in May, August and October of 1992, the horizontal loss amount, vertical diluted amount and vertical sediment amount of Hg in both surface and bottom layers were calculated and the block diagram model of Hg level and vertical change was determined by using change model of horizontal and vertical substance content that proposed by the author. The results showed that in May, August and October, the absolutely horizontal loss amount of Hg in the surface layer and bottom layer ranged from 0.004 to 0.029 μg/L, and the horizontally relative loss amount of Hg in the surface layer and bottom layer ranged from 16.00 to 72.50%. The Hg content in both the surface and bottom layer had an absolutely vertical diluted amount of 0.000-0.033 μg/L and a relatively vertical diluted amount of 0.00-82.50%. The absolutely vertical sediment amount of Hg in both the surface and bottom layer were 0.002-0.007 μg/L, and the relatively vertical sediment amount was 15.38-38.88%.The variation of horizontal loss amount revealed that in May, August and October, in the southeast of the bay or in the center of the Bay, whether the Hg content is provided by sources or not will result in relatively high horizontal loss amount of the surface layer. In May and August, there was no source of Hg in the center of the bay. No matter in the southeast of the Bay, the loss of Hg in the bottom layer was relatively low. In October, in the southeast of the bay or in the center of the Bay, there was no source of Hg content, but the loss of Hg content in the bottom layer was relatively high. The change of vertical loss amounts revealed that: in different waters, with the change of time, the vertical sediment amounts and vertical diluted amounts of Hg content in surface and bottom layer were mutually transformed.