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论文类型：期刊论文

发表时间：2008-06-01

发表刊物：CHEMOSPHERE

收录刊物：SCIE、EI、PubMed

卷号：72

期号：6

页面范围：925-931

ISSN号：0045-6535

关键字：humic acids fraction; size exclusion chromatography; iron; atrazine; photodegradation

摘要：Relationship between the photoinductive activity and the properties of humic acids (HA) fractions were investigated with and without Fe(III). Three fractions were separated based on the molecular weight (M-w) and were obtained following the order of N-w: F-A > F-B > F-C. Compared to F-A and F-B, photodegradation of atrazine under simulated sunlight was much faster in solution containing F-C, whose structure was dominated inated by greater aromaticity, more oxygen groups and fluorophores. The interaction of HA fractions and Fe(III) was studied using fluorescence spectrometry and F-C had the largest quenching constant. The capacity of electron transfer, estimated from the amount of photoformed Fe(II), was also highest for F-C. Thus, the Fe(III)-F-C complex was efficient in phototransformation of atrazine in nearly neutral aqueous solutions. These results suggest that the aromaticity and oxygen groups content of HA exert great influence on the binding ability of metals and on the fate of pollutants in natural waters. (C) 2008 Elsevier Ltd. All rights reserved.