Sedimentary organic matter and acid volatile sulfide as environmental quality indicators of Kagoshima Bay
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概要
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To estimate the mechanism of dynamic in sediment quality relative to eutrophication, we compared several parameters and characterized the sediments in Kagoshima Bay. This study analyzed sedimentary organic matter and acid volatile sulfide (AVS) as possible indicators of eutrophication. The sediment samples were collected in the months of July, 2001 and August, 2002. Organic matter and AVS concentrations of the sediments showed heterogeneous horizontal distribution and did not appreciably change over a period of one year. The ignition loss (IL) concentrations ranged from 1.1% to 13.4%, while total organic carbon (TOC) and total organic nitrogen (TON) ranged from 0.2% to 2.3% and 0.04% to 0.22%, respectively. Higher values for IL, TOC and TON were observed in various stations of the inner area and in deep basin stations of the central area of the bay. The parallel increase in TOC and TON with IL suggested that the distribution profiles of TOC and TON in the sediments should be closely associated with IL. Concentrations of AVS ranged from 0.01mg/g to 2.2mg/g of sediment (dry weight) with high values observed in the deep basin of the inner area. Vertical distribution analysis showed decreasing concentrations of IL, TOC and TON with increasing sediment depths in the inner parts of the bay. On the other hand, no marked differences among sediment depths in concentrations of these parameters were observed in the central area. These results give the clear picture of the horizontal and vertical characterization of sediment in Kagoshima Bay. These also indicated that organic matter and AVS concentrations could be used as indicators for assessing environmental quality of Kagoshima Bay.
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