期刊
WATER RESEARCH
卷 47, 期 17, 页码 6558-6565出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2013.08.029
关键词
Terbutaline; Photodegradation; DOM; Singlet oxygen; Hydroxyl radical
资金
- Office of Basic Energy Sciences, U.S. Department of Energy
- National Natural Science Foundation of China [21107016, 21377030]
- Ministry of Science and Technology of China [2012YQ220113-4]
- Science & Technology Commission of Shanghai Municipality [12PJ1400800]
- program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
In this study, varied nature organic matter isolates were employed to investigate the indirect photo transformation of terbutaline, which is a major feed additive medicine to increase the proportion of lean meat in the livestock. In the indirect photolysis of terbutaline under solar simulated irradiation, O-1(2) plays an important role among the center dot OH and (DOM)-D-3*. The reaction rate constant of O-1(2) was determined as (7.1 +/- 0.3) x 10(6) M-1 s(-1) at pH 7.0, while the reaction rate constant of center dot OH was (6.87 +/- 0.43) x 10(9) M-1 s(-1). The contribution of singlet oxygen to the indirect photolysis of terbutaline (19-44%) was higher than that of the hydroxyl radical (1-7%). The pseudo first order rate constants for the photodegradation of terbutaline increase with increasing pH, which indicates that pH mainly affects the reaction rate of the singlet oxygen with the phenolic part of the terbutaline. The Quinone was identified as the main photosensitized product through LC-MS/MS analysis. It is also proposed that the degradation pathway of terbutaline involves reaction between the phenolic part of terbutaline and singlet oxygen. This finding strongly suggests that singlet oxygen was important factor for the photodegradation of terbutaline in natural waters. (C) 2013 Elsevier Ltd. All rights reserved.
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