CODCR–BOD INDEX COMBINATION FOR ORGANIC POLLUTION INVESTIGATION IN BRACKISH LAKE: THE CHARACTERISTIC DEGRADATION OF DOMADELIA ANJU ASMARA, MIKIYA KATO, RYUHEI OGAWA AND MITSUO TODA
The brackish lake or water bodies are result of mixing of seawater with freshwater that has an extraordinary salinity characteristic. In this case, Lake Sanaru, located in Hamamatsu City, Japan, had been the most deficient water quality around 6 years began in 2001 that was represented by CODMn value. Nevertheless, CODMn is not enough to define the characteristic degradation of Dissolved Organic Matter (DOM). In the present work, we intend to view the degradation characteristic of organic matter in brackish lake from multi-angles with combining two methods, CODCr and BOD analysis. The standard measurement method of BOD and COD refer to JIS K 0102 and JIS K 0101, respectively. Not only field sample, simple organic compounds, such as ethanol, toluene, etc. also were investigated in different temperature and light condition that is representative of diversity seasons in Japan. The concentration of [NO3-N], [PO4-3], chlorophyll-a, and salinity also were measured. The result show that BOD index is more appropriate to explain the environmental transformation, biologically. On the other hand, the oxidation rates of organic matters for BOD are measured well by combining CODCr index. The characteristic of pollution components in Lake Sanaru using the combination trends dominated from organic compounds having carbonyl group which expected to be dominated.
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