Schramm K W, Behechti A, Beck B, Kettrup A
Institute of Ecological Chemistry, GSF-National Research Center for Environment and Health, Neuherberg, Ingolstädter Landstrasse 1, Oberschleissheim, D-85764, Germany.
Ecotoxicol Environ Saf. 1998 Sep;41(1):73-6. doi: 10.1006/eesa.1998.1669.
Several chemicals covering a wide range of octanol-water partition coefficients were assayed for their bioconcentration in Daphnia magna in the presence of an aquatic humic acid. Assuming the properties of the humic acid used were similar to those known for organic matter from soils, the influence of the aquatic humic acid on physicochemical moderation of bioconcentration could not be demonstrated experimentally in a log Kow range of the chemicals between 2 and 6. Thus, the lipophilic character of the aquatic humic acid and the related effect of solubilization of the chemicals in the aqueous phase are much less than expected. This result is confirmed by determining the octanol-water partition coefficient of the aquatic humic acid. Comparing this value with log Kow values of humic acids of terrestrial origin, it can be clearly demonstrated that the lipophilicity of the aquatic humic acid is lower by a factor of 50.
对一系列具有广泛辛醇 - 水分配系数的化学物质进行了测定，以研究它们在水生腐殖酸存在下于大型溞中的生物富集情况。假设所用腐殖酸的性质与已知的土壤有机质性质相似，在化学物质的log Kow范围为2至6时，无法通过实验证明水生腐殖酸对生物富集的物理化学调节作用。因此，水生腐殖酸的亲脂特性以及化学物质在水相中的增溶相关效应远低于预期。通过测定水生腐殖酸的辛醇 - 水分配系数证实了这一结果。将该值与陆地来源腐殖酸的log Kow值进行比较，可以清楚地表明水生腐殖酸的亲脂性低50倍。
