Photodegradation of Dissolved Organic Matterand Its Impact on the Biologic Processes

doi:10.7517/j.issn.1674-0475.2004.04.298

Abstract

Abstract: Dissolved organic matter (DOM) plays an important role on regulating the chemical,biological and physical characteristics of marine and freshwater ecosystems.Photodegradation 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 inorganic carbon (DIC))that represent direct photochemical mineralization of the DOM,other photoproducts are low molecular weight organic molecules,amino acids and carbon disulphide and carbonyl sulphide,which have a great impact on the biological processes.

Key words: photochemistry, dissolved organic matter, biological processes

CLC Number:

WANG Xue-jun, LOU Tao. Photodegradation of Dissolved Organic Matterand Its Impact on the Biologic Processes[J]. Imaging Science and Photochemistry, 2004, 22(4): 298-305.

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