title: Study on the stereoselective degradation of three triazole fungicides in sediment.
abstract: The stereoselective degradation behaviors of chiral triazole fungicides (hexaconazole, flutriafol and tebuconazole) in sediment were investigated under laboratory conditions. The enantiomers were completely separated by high-performance liquid chromatography on a cellulose tris(3-chloro-4-methylphenylcarbamate) (Lux Cellulose-2) column. The mean recoveries of hexaconazole, flutriafol and tebuconazole in sediment ranged from 86.7% to 105.9%. The methods were successfully applied for the enantioselective degradation analysis of fungicides in sediment. The results showed that the dissipation of hexaconazole, flutriafol and tebuconazole stereoisomers in sediment followed first-order kinetics (R(2)>0.95). The degradation rate of the enantiomers was different in sediment, and the (-)-enantiomer (t(1/2) was 86 days for hexaconazole, 139 for flutriafol and 136 for tebuconazole) degraded faster than the (+)-enantiomer (t(1/2) was 94 days for hexaconazole, 144 for flutriafol and 151 for tebuconazole) in native condition. The fungicides were degraded slowly, and no significant enantioselective degradation were observed under sterilized conditions. The results may hold promising implications for the environmental and ecological risk assessment of three important chiral triazole fungicides.
authors: Department of Pesticide Science, College of Plant Protection, Nanjing Agricultural University, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing 210095, PR China.
authors: Qing
authors: Q
authors: Zhang
authors: Department of Pesticide Science, College of Plant Protection, Nanjing Agricultural University, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing 210095, PR China.
authors: Liangliang
authors: L
authors: Zhou
authors: Department of Pesticide Science, College of Plant Protection, Nanjing Agricultural University, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing 210095, PR China.
authors: Yu
authors: Y
authors: Yang
authors: Department of Pesticide Science, College of Plant Protection, Nanjing Agricultural University, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing 210095, PR China.
authors: Xiude
authors: X
authors: Hua
authors: Department of Pesticide Science, College of Plant Protection, Nanjing Agricultural University, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing 210095, PR China.
authors: Haiyan
authors: H
authors: Shi
authors: Department of Pesticide Science, College of Plant Protection, Nanjing Agricultural University, State & Local Joint Engineering Research Center of Green Pesticide Invention and Application, Nanjing 210095, PR China. Electronic address: wangmha@njau.edu.cn.
authors: Minghua
authors: M
authors: Wang
mesh_terms: D001673:Biodegradation, Environmental; D002482:Cellulose / Q000031:analogs & derivatives; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004785:Environmental Pollutants / Q000378:metabolism*; D005659:Fungicides, Industrial / Q000378:metabolism*; D007700:Kinetics; D048448:Phenylcarbamates; D013237:Stereoisomerism; D014230:Triazoles / Q000378:metabolism*
chemical_list: D004785:Environmental Pollutants; D005659:Fungicides, Industrial; D048448:Phenylcarbamates; D014230:Triazoles; C538979:cellulose tris(3-chloro-4-methylphenylcarbamate); C087114:tebuconazole; C543009:flutriafol; D002482:Cellulose; C409722:hexaconazole
keywords: Flutriafol; Hexaconazole; Sediment; Stereoselective degradation; Tebuconazole