title: Photolysis of nonylphenol ethoxylates: the determination of the degradation kinetics and the intermediate products.
abstract: The photolysis of nonylphenol ethoxylates with an average oligomers length of ten ethoxylate units (NPEO(10)) in aqueous solution under UV, as well as the influence of humic acid (HA) on the photolysis was studied. A 125W high-pressure mercury lamp was employed as the light source. The intermediate products from the photolysis were determined by LC-MS. The results indicated that NPEO(10) underwent direct photolysis upon exposed to UV. The degradation pathway was complex. Besides the generally proposed degradation pathway of ethylene oxide (EO) side chains shortening, the oxidation of alkyl chain and EO chain led to intermediates having both a carboxylated (as well as carbonylated) ethoxylate and alkyl chain of varying lengths. The hydrogenation of benzene ring was also detected. The kinetics data showed that the first order reaction kinetics could be well used to describe the kinetics of NPEO(10) degradation. In the presence of dissolved organic matter by HA addition, the performance of NPEO(10) photodegradation was reduced. The photolysis rate decreased with increased HA concentration.
authors.affiliation: School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, Guangdong, PR China.
authors.forename: Ling
authors.initials: L
authors.lastname: Chen
authors.forename: Hai-Yun
authors.initials: HY
authors.lastname: Zhou
authors.forename: Qin-Ying
authors.initials: QY
authors.lastname: Deng
mesh_terms: D004785:Environmental Pollutants / Q000737:chemistry; D005026:Ethylene Glycols / Q000737:chemistry* / Q000528:radiation effects*; D006812:Humic Substances; D007700:Kinetics; D010782:Photolysis / Q000187:drug effects; D014466:Ultraviolet Rays
chemical_list: D004785:Environmental Pollutants; D005026:Ethylene Glycols; D006812:Humic Substances; C021754:terics