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环境化学  2015 

DOI:10.7524/j.issn.0254-6108.2014.02.019

Keywords: 水溶性有机质,土壤,有机污染物,吸附

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Abstract:

在自然环境中,水溶性有机质(DOM)会对土壤吸附有机污染物产生影响.基于已有的成果,本文综合分析了DOM的有关因素对土壤吸附有机污染物的影响.研究表明,不同来源的DOM的亲疏水组分比例不同;随着腐解时间的增长,亲水组分减小,疏水组分增加.外源DOM的极性与亲疏水组分所含官能团的种类和数量、分子量均会影响有机污染物的吸附;DOM的临界值浓度与土壤有机质含量负相关.当DOM浓度大于临界值时抑制吸附,反之促进吸附.DOM具有酸碱缓冲作用,影响土壤溶液的pH,进而影响对有机污染物的吸附.由于土壤内源DOM对有机污染物具有增溶作用,会抑制土壤吸附有机污染物.论文最后对今后的相关研究方向提出了建议.

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