Effects of aquatic humus on accumulation and acute toxicity of some organic micropollutants.

Accumulation experiments in a natural humic water revealed significantly lower bioconcentration of dehydroabietic acid and benzo(a)pyrene into Daphnia magna when compared with a standardized soft freshwater. For pentachlorophenol no such effect could be observed. Depending on the chemical involved, the natural humic water might affect the acute lethal toxicity of aquatic contaminants to this organism.