Ecological studies on bacteria in the sea and lake waters polluted with organic substances part 4 determination of bacterial degradable organic matter in aquatic environments

Ishida, Y.; Uchida, A.; Kadota, H.

Nippon Suisan Gakkaishi 43(7): 885-892


ISSN/ISBN: 0021-5392
Accession: 005210828

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Dissolved organic matter in sea waters polluted with organic matter to various extents was fractionated by ultrafiltration. The fraction of dissolved organic matter containing substances of MW < 10,000 was easily utilized by bacteria when the water temperature was relatively high. The amounts of organic matter degradable by bacteria in lake water were estimated in water samples by measuring the changes in organic matter concentrations attributable to the bacterial growth during in situ incubation. Even in the case of polluted environments, the ratio of the amount of dissolved organic matter utilizable by bacteria to the total amount of dissolved organic matter was not very high. In polluted environments the fraction of utilizable dissolved organic matter is apparently more quickly consumed by bacteria than in unpolluted environments. On the basis of the data obtained, an equation for estimating the utilization rate (.alpha.) of dissolved organic matter by bacteria was proposed. Applying this equation, the utilization rates of dissolved organic matter by bacteria in lake water was estimated with various water samples.