瀬戸内海における石油廃水の漁場に及ぼす影響に関する研究-II : 海底上の廃油の分布

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The present work deals with the pollution of sea bottom by wastes from oil factories, as indicated by ether-extractable substances, ignition loss, COD and sulfide in the bottom mud. The distributions of ignition loss and ether-extractable substances are shown in Figs. 1 and 2, and the relation between their values presented in Fig. 3. The marked correlations between them were observed it the regions of Osaka and Shimotsu, both of which have semiclosed geographical features. The appearance of visible spots or odour of oily waste was observed on the mud which contained ether-extractable substances more than 4mg/g, and located within the limits of l km from the out-fall of oily waste. The distributions of sulfide and COD are shown in Figs. 4 and 5. The relations between ether-extractable substances and sulfide or COD in the mud are given in Figs. 6 and 7, res-pectively. Both sulfide amounts and COD values increased with increment of ether-extractable substances. This tendency observed in the Shimotsu area, where oily wastes are mainly discharaged, may indicate that the oil pollution brings about the increases of sulfide amounts and COD values in the mud.