Comparative Study of Chemical Oxygen Demand and Total Organic Carbon in Omura Bay

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  • 大村湾海水における過ﾏﾝｶﾞﾝ酸ｶﾘｳﾑ消費量と全有機炭素の比較検討

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Abstract

The organic pollutant levels in Omura Bay were evaluated by measuring chemical oxygen demand(COD)and total organic carbon(TOC). We investigated these factors in Omura Bay from May 2008 to May 2010, in order to clarify the relationship between them. Samples were collected from four depths(0, 2, 6, and 10 m)at five sites. The COD values ranged from 0.68 to 3.94 mg/L with a mean value of 1.95 mg/L, while the TOC values ranged from 0.811 to 2.170 mg/L with a mean value of 1.345 mg/L. Although half of the samples showed high COD values(>2.0 mg/L), most of the samples showed low TOC values(<2.0 mg/L). The samples from the upper layer showed higher COD and TOC values than the samples from the middle or bottom layers. A significant positive correlation between the COD and TOC values was obtained(0.604); furthermore, a strong correlation between these parameters was observed for the samples obtained from the inner bay. These results suggest that measuring TOC may be useful for estimating the degree of pollution in enclosed coastal sea areas.

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