title: Dissipation kinetics and residues of florasulam and tribenuron-methyl in wheat ecosystem.
abstract: The dissipation kinetics and residual levels of florasulam and tribenuron-methyl in wheat field ecosystem were determined using a quick, easy, cheap, efficient, rugged and safe method (QuEChERS) with rapid resolution liquid chromatography tandem mass spectrometry (RRLC-MS/MS). The average recoveries of florasulam and tribenuron-methyl at three spiking levels in wheat plant, soil, wheat straw and wheat grain ranged from 72.8% to 99.2% with relative standard deviations (RSDs) were less than 10.1% and 82.5% to 103.8% with RSDs were less than 9.4%, respectively. The limits of quantification (LOQs) of florasulam and tribenuron-methyl for wheat plant, wheat straw, wheat grain and soil were 0.01, 0.01, 0.005, 0.005 mg kg(-1), respectively. The field trials results showed that the half-lives of florasulam were 2.76-10.83 d. Half-lives for tribenuron-methyl were found to be 1.27-5.37 d. The terminal residues in wheat grain were much lower than maximum residue limits (MRLs) set by China (0.01 mg kg(-1) for florasulam and 0.05 mg kg(-1) for tribenuron-methyl), which considered to be safe for human beings. These results will contribute to establishing the scientific basis of the dosage of florasulam and tribenuron-methyl for use in wheat field ecosystems.
authors.affiliation: Lab of Pesticide Residues and Environmental Toxicology, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, PR China.
authors.forename: Bizhang
authors.initials: B
authors.lastname: Dong
authors.affiliation: Lab of Pesticide Residues and Environmental Toxicology, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Qian
authors.affiliation: Lab of Pesticide Residues and Environmental Toxicology, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing 100083, PR China. Electronic address: jyhu@ustb.edu.cn.
authors.forename: Jiye
authors.initials: J
authors.lastname: Hu
mesh_terms: D001190:Arylsulfonates / Q000032:analysis*; D002681:China; D002853:Chromatography, Liquid; D017753:Ecosystem; D004784:Environmental Monitoring; D006207:Half-Life; D007700:Kinetics; D010573:Pesticide Residues / Q000032:analysis*; D011743:Pyrimidines / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D013449:Sulfonamides / Q000032:analysis*; D053719:Tandem Mass Spectrometry / Q000379:methods; D014908:Triticum / Q000737:chemistry*
chemical_list: D001190:Arylsulfonates; D010573:Pesticide Residues; D011743:Pyrimidines; D012989:Soil Pollutants; D013449:Sulfonamides; C413390:florasulam; C050296:metsulfuron methyl
keywords: Dissipation; Florasulam; Residue; Soil; Tribenuron-methyl; Wheat