Chemical and optical phototransformation of dissolved organic matter

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• 作者：Steven Loiselle^a ; ^b ; ^{loiselle@unisi.it} ; Davide Vione^c ; ^d ; Claudio Minero^c ; Valter Maurino^c ; Antonio Tognazzi^a ; ^b ; Arduino M. Dattilo^a ; ^b ; Claudio Rossi^a ; ^b ; Luca Bracchini^a ; ^b
• 关键词：Photochemistry ; Photogenerated transients ; Direct and sensitized photolysis ; Absorption spectral slope ; Photobleaching
• 刊名：Water Research
• 出版年：2012
• 期刊代码：57_00431354
• 类别：civ
• 出版时间：15 June, 2012
• 卷：46
• 期：10
• 页码：3197-3207
• 文件大小：917 K

摘要

Dissolved organic matter represents the main reservoir of organic carbon in most aquatic ecosystems. In the present study, we determined the optical changes and the quantum yields of transient species formation for chromophoric dissolved organic matter (CDOM) samples undergoing photodegradation. The results show that the triplet states ³CDOM^{鈭?/sup> are potentially key players in CDOM photodegradation and that such transformations are strongly influenced by small differences in CDOM sources and sinks. In contrast, OH radicals are very unlikely to play a key role in phototransformation. These results represent an important first step in combining optical and transient species analyses to understand photodegradation processes of dissolved organic matter.}