Effects of Dissolved Organic Matter(DOM) on Environmental Behavior of Organic Pollutants and Its Significance for Environment

Dissolved organic matter(DOM) is a very active component in terrestrial and aquatic ecosystems,which plays an important role for exchange of materials between pedosphere and spheres concerned.It affects the toxicity,migration,transformation and biodegradability of organic pollutants.This article reviews its sources,compositions,characteristics,especially its effects on environmental behavior of organic matter.DOM intensifies or inhibits the absorption/desorption,bioavailability of organic matter in soils through hydrogen bond,charge transfer,Van der Waals forces,ligand exchange,hydrophobic partition,covalent bonding,chelation etc.It suggests that the combination of DOM and organic matter has duality.The effects of different constituent and molecular weight on environmental behavior of organic matters are different.