Effect of short-chain organic acids and pH on the behaviors of pyrene in soil-water system
Effect of short-chain organic acids and pH on the behaviors of pyrene in soil-water system
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DOI：
10.1016/j.chemosphere.2010.09.012
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发表时间：
2010-12-01
期刊：
影响因子：
8.8
通讯作者：
Li, Gongchen
中科院分区：
文献类型：
--
作者：
An, Chunjiang;Huang, Guohe;Li, Gongchen
研究了5种短链有机酸（SCOAs）对芘在土壤-水体系中吸附行为的影响，考察了有机酸的种类、数量、pH值、土壤溶解性有机质等因素对吸附行为的影响。结果表明，SCOAs对芘的吸附有抑制作用，对芘的解吸有促进作用。柠檬酸>草酸>酒石酸>乳酸>乙酸。芘吸附性能的下降幅度随SCOA浓度的增加而增大，但在高浓度下下降幅度变小。在有机酸的存在下，芘的吸附能力随着pH值的增加而降低。然而，有一个轻微的增加，芘的吸附与草酸，酒石酸和柠檬酸的pH值高于8。有溶解性有机质和无溶解性有机质的土壤对芘的截留能力差异显著。SCOAs的存在也有利于减少芘在无溶解性有机质土壤上的吸附。该研究结果对土壤和地下水中持久性有机污染物的修复具有重要意义。(C)2010爱思唯尔有限公司版权所有
The effects of five short-chain organic acids (SCOAs) on the behaviors of pyrene in soil-water system were investigated The influences of the quantity and species of organic acids, pH, and soil dissolved organic matter were considered The results showed the presence of SCOAs inhibited the adsorption and promoted the desorption of pyrene in the following order: citric acid > oxalic acid > tartaric acid > lactic acid > acetic acid. The decreased extents of pyrene adsorption performance enhanced with increasing SCOA concentrations, while the decreasing rate became less pronounced at high SCOA concentrations. In the presence of organic acids, the adsorption ability of pyrene decreased with increasing pH. However, there was a slight increase of pyrene adsorption with the addition of oxalic acid, tartaric acid and citric acid above pH 8. The capacity for pyrene retention differentiated significantly between the soils with and without dissolved organic matter. The presence of SCOAs was also favorable for the decrease of pyrene adsorption on soil without dissolved organic matter. The results of this study have important implications for the remediation of persistent organic pollutants in soil and groundwater. (C) 2010 Elsevier Ltd All rights reserved