溶解性有機物組成による河川水の評価

概要

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In order to clarify the mechanism of water pollution in a river, the River Ohtsu and the River Shinkawa were chosen and the changes of concentrations and components of the dissolved organic substances were investigated.Water was sampled once a week from June 1984 to August 1987. Each water sample was filtered through a 0.45 μm membrane filter and used for the determination of the concentrations of dissolved organic substances.The concentration ranges of dissolved TOC in samples collected from the River Ohtsu and the River Shinkawa during the experimental term were 8.6-16.6mg·l-1 and 5.7-8.3mg·l-1, respectively. In the summer season, the dissolved TOC in the River Ohtsu was composed of proteins, 14-18% ; carbohydrates, 16-19% ; volatile organic acids, 2-6% ; anion surfactants, 5-9% ; humic acids, 4-6% ; lignin, 2-4% and urea, 1-2%.The concentration ratios of each component in the samples from the River Ohtsu, which catches the wastewater from its urbanized catchment area, were very similar to those of the municipal wastewater. In case of the River Ohtsu, therefore, the contamination by wastewater from its catchment area is thought to be a major cause of the pollution. On the other hand, as one of the cause of the pollution of the River Shinkawa, the influx of the organic substances from the domestic wastewater may contribute greatly.