光化学降解溶解有机物及其对生物过程的影响

溶解有机物对控制海洋和淡水水生系统的化学、生物和物理特性有重要的影响.光化学降解溶解有机物改变了生态体系的溶解有机碳、有机物的分子量及光学特性,并且产生复杂的反应性氧化合物、二氧化碳、一氧化碳、小分子量的有机酸、氨基酸、二硫化碳等,对生物过程有重要的影响.本文简要综述了光化学降解溶解有机物的过程机理及其对生物过程的影响.

Photodegradation of Dissolved Organic Matter and Its Impact on the Biologic Processes

Dissolved organic matter (DOM) plays an important role on regulating the chemical, biological and physical characteristics of marine and freshwater ecosystems. Pho todegradation of DOM results in reduction of dissolved organic carbon (DOC), average molecular weights,changes in water optical properties and in the production of complex mixture of reactive oxygen species and carbon photoproducts. The photoproducts mainly are inorganic compounds(e. G. Carbon monoxide, carbon dioxide and other dissolved inor ganic carbon (DIC))that represent direct photochemical mineralization of the DOM, other photoproducts are low molecular weight organic molecules, amino acids and carbon disul phide and carbonyl sulphide, which have a great impact on the biological processes.