宍道湖西部における水環境の水底泥による評価

Abstract

Water environment of closed water area was influenced by eluting nutrient salt and hydrogen sulfide of clay in the bottom. Those chemical elements were made through organic matter was decomposed. Samples of clay were taken from the bottom in the west part of Lake Sinji, and the ratio of ignition loss, “ILα°C”, was measured by each 100°C from 300°C to 600°C. It was known that intactness organic matter was burned in low temperature. By using the characteristic of organic matter, ratio of intactness organic matter could be estimated by IL300°C/IL600°C. It was suggested that decomposition condition of organic matter and reduced state of clay in the bottom could be estimated by the distribution of ignition loss and IL300°C/IL600°C.