title: Photodegradation of organophosphorus pesticides in honey medium.
abstract: Honey can be polluted due to environmental pollution and misuse of beekeeping practices. In the present study, photodegradation experiments of organophosphorus pesticides (coumaphos, methyl parathion and fenitrothion) in honey medium were conducted using Atlas Suntest simulator CPS+ as a sunlight producer. Photodegradation experiments were conducted under three different intensities as 250W/m(2), 500W/m(2) and 750W/m(2) to evaluate the impact of sunlight intensity on removal of OPs in honey medium. Significant decreases of three OPs' concentrations were observed. Coumaphos showed the highest degradability, reaching a degradation percentage of 90 percent within 15min. After 1h irradiation, residual percentages of coumaphos were 6.62 percent for 250W/m(2), 3.48 percent for 500W/m(2) and 2.98 percent for 750W/m(2), respectively. Methyl parathion and fenitrothion also could be removed through photodegradation efficiently. After 1h irradiation, the residual percentages of methyl parathion and fenitrothion under 750W/m(2) sunlight irradiation were 26.89 percent and 16.70 percent, respectively. Intensity of sunlight showed a positive impact on removal of OPs in honey medium. The higher intensity, the lower residual percentage. Photodegradation of three OPs fitted well with pseudo-first order kinetics. Half-lives calculated from pseudo-first order kinetics were 17.61min (250W/m(2)), 16.67min (500W/m(2)) and 17.58min (750W/m(2)) for coumaphos, 57.62min (250W/m(2)), 34.13min (500W/m(2)) and 31.69min (750W/m(2)) for methyl parathion and 144.70min (250W/m(2)), 95.47min (500W/m(2)) and 22.57min (750W/m(2)) for fenitrothion, respectively. Most of the three OPs could dissipate in a short time under sunlight irradiation. Photodegradation could be accepted as an appropriate method for the removal of OPs in honey medium.
authors.affiliation: School of Civil & Environmental Engineering and National "International Cooperation Based on Environment and Energy", and Key Laboratory of "Metal and Mine Efficiently Exploiting and Safety" Ministry of Education, University of Science and Technology Beijing, 100083 Beijing, PR China.
authors.forename: Zhimin
authors.initials: Z
authors.lastname: Yuan
authors.affiliation: School of Civil & Environmental Engineering and National "International Cooperation Based on Environment and Energy", and Key Laboratory of "Metal and Mine Efficiently Exploiting and Safety" Ministry of Education, University of Science and Technology Beijing, 100083 Beijing, PR China. Electronic address: yaojun@ustb.edu.cn.
authors.forename: Jun
authors.initials: J
authors.lastname: Yao
authors.affiliation: School of Civil & Environmental Engineering and National "International Cooperation Based on Environment and Energy", and Key Laboratory of "Metal and Mine Efficiently Exploiting and Safety" Ministry of Education, University of Science and Technology Beijing, 100083 Beijing, PR China.
authors.forename: Haijun
authors.initials: H
authors.lastname: Liu
authors.affiliation: School of Civil & Environmental Engineering and National "International Cooperation Based on Environment and Energy", and Key Laboratory of "Metal and Mine Efficiently Exploiting and Safety" Ministry of Education, University of Science and Technology Beijing, 100083 Beijing, PR China.
authors.forename: Jun
authors.initials: J
authors.lastname: Han
authors.affiliation: Laboratory for Environmental Research, University of Nova Gorica, Vipavska 13, SI-5000 Nova Gorica, Slovenia.
authors.forename: Polonca
authors.initials: P
authors.lastname: Trebše
mesh_terms: D003372:Coumaphos / Q000737:chemistry*; D004785:Environmental Pollutants / Q000737:chemistry; D005240:Feasibility Studies; D005278:Fenitrothion / Q000737:chemistry*; D006722:Honey; D007306:Insecticides / Q000737:chemistry; D007700:Kinetics; D008743:Methyl Parathion / Q000737:chemistry*; D010782:Photolysis; D013472:Sunlight
chemical_list: D004785:Environmental Pollutants; D007306:Insecticides; D008743:Methyl Parathion; D003372:Coumaphos; D005278:Fenitrothion
keywords: Coumaphos; Fenitrothion; Methyl parathion; Photodegradation; Pseudo-first order kinetics; Pseudo-second order kinetics