長崎湾の底質と有機物

概要

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Samples from 57 stations in the Nagasaki bay were analyzed for grain size distribution, ignition loss and organic matter. The results are summarized as follows; 1. In the inner bay; Nagasaki harbor, the most prevalent deposits are sandy silt and clayey silt which contain a relatively high quantity of organic matter. The silty sand and sand lie in the bottom of the outer bay. 2. The average ignition loss is 8.87% in the 56 samples, 10.98% in the harbor and 7.30% in the out of harbor. In the harbor, the highest ignition loss observed was 18.86%. There is a good correlation between the mud content and the ignition loss. 3.The average content of organic carbon, total hydrogen and total nitrogen in the samples are 2.54, 0.49 and 0.126%, pectively. Their concentration are high in the fine grained sediments of the harbor. Average C/N ratio is 18.95, ranged from 6.25 to 42.09. 4. The carbon of the organic matter is not decomposed by hydrogen peroxide is constituted from 7-67% with a 29% average of the organic carbon of the untreated samples. 5. The organic constituents in the medium grained sand were foud to be the fragments of coal, charcoal, coke and plant fiber. The materials give rise to relatively higher C/N ratio than would be expected to occur naturally in a bay.
長崎大学教育学部の論文