Cea Mara, Seaman J C, Jara Alejandra A, Fuentes Bárbara, Mora M L, Diez M C
Department of Chemical Engineering, University of La Frontera, PO Box 54-D, Temuco, Chile.
Chemosphere. 2007 Apr;67(7):1354-60. doi: 10.1016/j.chemosphere.2006.10.080. Epub 2007 Jan 10.
The adsorption of 2,4-dichlorophenol (2,4-DCP) and pentachlorophenol (PCP) by a variable-charge soil from southern Chile was studied in a series of batch equilibration experiments. 2,4-DCP and PCP adsorption behavior was evaluated as a function of pH (pH values of 4.5, 6.0 and 7.5) in a 0.1M KCl (25 degrees C) background solution for soil material collected at three different depths (0-20 cm, 20-40 cm, and 40-60 cm). 2,4-DCP and PCP adsorption decreased with increasing soil pH, suggesting that the undissociated species were adsorbed more readily and that electrostatic repulsion may inhibit partitioning as pH increases. The PCP adsorption was greater than observed for 2,4-DCP and decreased with soil depth. Multiple regression analysis between K(d) and various soil properties indicated that the soil organic carbon content is a strong indicator of chlorophenol adsorption, and in addition to organic carbon, the soil pH is an important property controlling adsorption behavior.
通过一系列批次平衡实验，研究了智利南部可变电荷土壤对2,4 - 二氯酚（2,4 - DCP）和五氯酚（PCP）的吸附情况。在0.1M KCl（25℃）背景溶液中，针对从三个不同深度（0 - 20厘米、20 - 40厘米和40 - 60厘米）采集的土壤材料，评估了2,4 - DCP和PCP在pH值为4.5、6.0和7.5时的吸附行为。2,4 - DCP和PCP的吸附量随土壤pH值升高而降低，这表明未解离的物种更容易被吸附，并且随着pH值升高，静电排斥可能会抑制分配。PCP的吸附量大于2,4 - DCP，且随土壤深度降低。K(d)与各种土壤性质之间的多元回归分析表明，土壤有机碳含量是氯酚吸附的一个强指标，除有机碳外，土壤pH值是控制吸附行为的一个重要性质。
