title: [Photochemical degradation of chlorpyrifos in water].
abstract: In this paper, the effects of different light sources, temperature, pH, and water quality on the photochemical degradation of clilorpyrifos in water were examined under natural and simulated solar irradiation. The results showed that the photochemical degradation of chlorpyrifos in water followed the first order reaction, and its half-life was 0.62, 6.92, 19.74 and 22.50 h under high pressure mercury lamp (HPML), xenon lamp (XL), ultraviolet lamp (UV), and sunlight (SL) irradiation, respectively. Temperature had a significant effect on the degradation rate of chlorpyrifos, which was increased with increasing temperature and reached the maximum at 35 degrees C. The degradation rate of chlorpyrifos was stable both in acid and in neutral buffer solution, but enhanced in alkaline buffer solution. Water quality also had a significant effect, with a decreasing degradation rate of chlorpyrifos in the sequence of distilled water > tap water > river water > lake wate > paddy water.
authors.affiliation: Key Laboratory of Anhui Agro-Food Safety, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China. wxwahau@ahau.edu.cn
authors.forename: Xiangwei
authors.initials: X
authors.lastname: Wu
authors.forename: Rimao
authors.initials: R
authors.lastname: Hua
authors.forename: Feng
authors.initials: F
authors.lastname: Tang
authors.forename: Xuede
authors.initials: X
authors.lastname: Li
authors.forename: Haiqun
authors.initials: H
authors.lastname: Cao
authors.forename: Yongde
authors.initials: Y
authors.lastname: Yue
mesh_terms: D001673:Biodegradation, Environmental; D004390:Chlorpyrifos / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007306:Insecticides / Q000737:chemistry*; D008027:Light; D010777:Photochemistry; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D007306:Insecticides; D014874:Water Pollutants, Chemical; D004390:Chlorpyrifos