Photodegradation of Atrazine in the Presence of Humic Acid originated from different soils

摘要

@@ 1 Introduction Public concern about the ubiquitous presence of emerging persistent toxic substances (PTS) in water has increased, mainly because a large number of herbicides have been detected in this environmental compartment (1-3). Photochemical transformation is one of the main degradation pathways for PTS in natural waters. Therefore, direct and indirect photochemical reactions may contribute to the transformation of these compounds in sunlit surface waters. Humic acid (HA) which is the major components of dissolved organic matter (DOM), are widely distributed in nature. Numerous studies have demonstrated that HA plays an important role in photochemical degradation of PTS because it is one of the most important natural sunlight-absorbing components (4,5). In this paper, atrazine is served as probe pollutant since it is one of the most widely used herbicide throughout the world.