水溶性有机质对土壤中污染物环境行为影响的研究进展

水溶性有机质(DOM)作为有机配位体,含有羧基、羟基、羰基和甲氧基等活性功能团,可以通过与土壤中的污染物发生离子交换、吸附、络合、螯合、凝絮、氧化还原等一系列反应,进而影响它们在土壤中的形态、迁移转化和最终归宿。本文概述了DOM在土壤中的吸附,系统总结了近年来国内外关于水溶性有机质对土壤中污染物影响的研究进展,阐述了水溶性有机质能提高重金属的溶解度及其对重金属、农药、PAHs吸附解吸、迁移等环境行为所起的作用,最后指出今后应该进一步研究的问题。

Advances in Research on the Influence of Environmental Behaviors of Pollutants in Soils Caused by Water Dissolvable Organic Matter

As organic ligands,the water dissolvable organic matters(DOM) contain many active functional groups such as carboxyl,hydroxyl,carbonyl,and methoxyl.They could affect the form,migration,transformation and sedimentation of pollutants in soils through a series of interactions,such as ion exchange,absorption,ligation,chelating,pectisation,oxidation-reduction and so on,between pollutants in soils and them.This paper has briefly described the absorption of DOM in soils,systematically summarized advances in research on the influence of pollutions in soils caused by DOM in recent years,pointed out that DOM could improve the solubility of heavy metals,and could affect the environmental behaviors,such as absorption-desorption and migration,of heavy metals,pesticide and PAHs in soils,and finally raised some questions that should be further studied.