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水溶性有机物对土壤吸附-解吸菲的影响 预览 被引量:24

Effect of Dissolved Organic Matter on Phenanthrene Sorption-Desorption in Soil System
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摘要 以Tween-80为对照,有机物料猪粪(pig manure,PM)、绿肥(green manure,GM)和污泥(sewage sludge,SS)为水溶性有机物(dissolved organic matter,DOM)的提取原料,菲(Phe)为多环芳烃(PAHs)的代表,采用序批试验研究了不同来源DOM对土壤吸附与解吸Phe的影响.结果表明,供试DOM均能明显降低Phe在土壤上的吸附.在DOM试验浓度范围内(0-300mg·L^-1).土壤对Phe的吸附量与DOM浓度之间呈极显著负直线相关关系(rPM=-0.9888,rSS=-0.9826,rTween-80=-0.9743,rGM=-0.9905).菲的吸附等温线可用Freundlich方程定量描述.供试3种DOM抑制土壤吸附Phe和促进土壤吸附Phe的解吸的强弱顺序为:猪粪DOM〉污泥DOM〉绿肥DOM.本研究结果表明,农业土壤中水溶性有机物能明显活化土壤中的PAHs,增强其在土壤中的移动性. Batch experiments were conducted to investigate effect of dissolved organic matter (DOM) on the adsorption and desorption behavior of Phernanthrene (Phe) in a soil-water system. It was found that three natural DOM derived from pig manure (PM), sewage sludge (SS), green manure (GM) and a kind of surfactant Tween-80 can reduced sorption of Phenanthrene significantly onto the tested soil. Within the selected concentration of the Phenanthrene and DOM in this study, the sorption quantity has a negative-linear eorrelativity with the concentration of DOM ( rPM = - 0. 988 8, rSS = - 0. 982 6, rTween-80 = - 0. 974 3, rGM = - 0. 990 5). The inhibition of Phenanthrene sorption caused by DOM of PM origin was more significant than that of SS origin and GM origin for the same soil. Phenanthrene sorption isotherm could be described well by the Freundlich equation. It implied that DOM can affect the environmental behaviors of Phenanthrene in soil.
作者 吴文铸 占新华 周立祥 WU Wen-zhu, ZHAN Xin-hua, ZHOU Li-xiang (College of Resource and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China)
出处 《环境科学》 CAS CSCD 北大核心 2007年第2期 267-271,共5页 Chinese Journal of Environmental Science
基金 国家自然科学基金项目(20377024,40571073)
关键词 水溶性有机物 吸附 解吸 土壤 Phe DOM sorption desorption soil
作者简介 吴文铸(1983-),男,硕士研究生,主要研究方向为环境污染化学,E-mail:kingwwz@sohu.com 通讯联系人,E-mail:lxzhou@njau.edu.cn
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