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Effect of pH on binding of pyrene to hydrophobic fractions of dissolved organic matter (DOM) isolated from lake water

《中国地球化学学报:英文版》2016年 第3期 | Yi Mei Yingchen Bai Liying Wang   State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550081 China State Environmental Protection Key Laboratory for LakePollution Control Research Center of Lake Environment Chinese Research Academy of Environmental Sciences Beijing 100012 China
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摘 要:In order to better understand the compositional and structural complexity of dissolved organic matter(DOM) macromolecules and provide mechanistic information on the binding of hydrophobic organic contaminants(HOCs) to DOM, we fractionated large amounts of lake water into three hydrophobic DOM-fractions. The variation of the partitioning coef?cients(KDOC) of pyrene at different p H levels was examined by ?orescence quenching titration. Results show that, relative to the more polar acidic DOM-fractions, the hydrophobic neutral fraction exhibits a higher sorption ability to pyrene. Generally, the sorption of pyrene to the three hydrophobic fractions is strongly pH-dependent. The KDOC values of pyrene generally increase with decreasing p H levels, which is especially obvious in the sorption of pyrene to the fulvic acid fractions, suggesting that the binding is controlled by hydrophobic interactions. The mechanisms underlying the binding of pyrene to the hydrophobic fractions were also discussed. Our data are bene?cial to further understanding the binding of HOCs to DOM and how it has been affected,which may result in more accurate predictions of KDOC.
【分 类】【环境科学、安全科学】 > 环境污染及其防治 > 土壤污染及其防治【工业技术】 > 化学工业 > 一般性问题 > 化工厂 > 工业用水、水的处理 > 水的处理
【关键词】 疏水性有机污染物 溶解有机物 DOM 酸组分 pH值 分离 湖水 绑定
【出 处】 《中国地球化学学报:英文版》2016年 第3期 288-293页 共6页
【收 录】 中文科技期刊数据库

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