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环境化学  2015 

无机离子对芘与天然溶解性有机质结合系数的影响

Keywords: 溶解性有机质,离子强度,荧光淬灭,结合常数,多环芳烃

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Abstract:

从天津市北塘河口沉积物提取了天然溶解性有机质(dissolvedorganicmatter,DOM),利用荧光淬灭法测定了芘与所得DOM的结合系数KDOM,并研究了不同离子强度及离子类型对KDOM的影响.结果表明,DOM对芘的KDOM为1.27×105L·kg-1,远高于固态有机质的吸附能力,说明DOM对多环芳烃等憎水性有机污染物在水环境中的归趋具有不可忽视的影响.随着阳离子浓度的增加,芘的KDOM呈现先降低,再升高,然后稳定在某一值的复杂变化趋势.不同阳离子对芘的KDOM具有不同的影响,而所研究阴离子对KDOM影响不大.

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