title: Comparison of the photoconversion of para-chlorophenol under simulated sunlight and UV irradiation in ice.
abstract: The photochemistry of para-chlorophenol (4-CP) was studied under simulated sunlight (lambda > 300 nm) and UV irradiation by using a 125 W high-pressure mercury lamp with or without a hard glass as light source in an ice matrix. The experiments were carried out in a photochemical cold chamber reactor at -14 to -12 degrees C. The photoconversion rate, photoproducts and photoconversion mechanism of 4-CP were all inspected and compared. The results show that the 4-CP photoconversion obeys the first order kinetic model and its photoconversion rate is highly affected by the initial concentration of 4-CP, light intensity and water quality. It is found that the conversion rate of 4-CP under UV irradiation is higher than that under simulated sunlight irradiation. The intermediate products of 4-CP were characterized by GC-MS, HPLC-ESI-MS and HPLC techniques and the possible photoconversion mechanism was proposed accordingly. It is concluded that the mechanism and photoproducts of 4-CP photolysis in ice are different from those in water, and the photoproducts and photoconversion pathways of 4-CP in ice varied with different light sources.
authors.affiliation: Key Laboratory of Groundwater Resources and Environment, Ministry of Education Jilin University, Changchun 130021, China.
authors.forename: Hong-Jie
authors.initials: HJ
authors.lastname: Gao
authors.forename: Chun-Li
authors.initials: CL
authors.lastname: Kang
authors.forename: Yong-Hui
authors.initials: YH
authors.lastname: Song
authors.forename: Ping
authors.initials: P
authors.lastname: Guo
authors.forename: Xing-Hua
authors.initials: XH
authors.lastname: Lang
authors.forename: Fei
authors.initials: F
authors.lastname: Peng
mesh_terms: D002733:Chlorophenols / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D008401:Gas Chromatography-Mass Spectrometry; D007053:Ice; D007700:Kinetics; D010777:Photochemistry; D021241:Spectrometry, Mass, Electrospray Ionization; D013472:Sunlight; D014466:Ultraviolet Rays
chemical_list: D002733:Chlorophenols; D007053:Ice; C029107:4-chlorophenol