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首页> 美国政府科技报告 >Biological Importance of Humic Material in Acidified Waters. A Summary of the Chemistry, Biology and Ecotoxicology of Aquatic Humus in Acidified Surface Waters
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Biological Importance of Humic Material in Acidified Waters. A Summary of the Chemistry, Biology and Ecotoxicology of Aquatic Humus in Acidified Surface Waters

机译：酸性水中腐殖质的生物学重要性。酸化地表水体中水生腐殖质的化学，生物学和生态毒理学综述

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Several lines of evidence suggest that the response of freshwater organisms to aquatic humus under acidified conditions is best described as a curvilinear, second order relationship. At low concentrations in acidified environments aquatic humus can bind with toxic metals, reduce membrane dysfunction caused by low pH, and in general protect, stimulate, or feed aquatic organisms to minimize the effects of acidification. At high concentrations humus itself becomes toxic. This is most likely due to increased permeability of cell membranes to lipophilic substances present in aquatic humus. An octanol/water partition coefficient has been developed and shown to be pH dependent, indicating that the hydrophobic character of humus can have biological meaning. The report is divided into two sections. First the methods and definitions of humus chemistry as they pertain to the biological importance of aquatic humus is discussed. Then the biological mechanisms of aquatic humus are presented. These sections form the basis for our main conclusions concerning the positive and negative effects of aquatic humus. (With 164 refs.). (ERA citation 14:020608)

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