title: Dissipation dynamics and final residues of cloransulam-methyl in soybean and soil.
abstract: This work is the first report on the dissipation and final residue of cloransulam-methyl on soybean plant at field conditions. A fast, simple, and reliable residue analytical method for determination of cloransulam-methyl in soybean matrices and soil was developed based on quick, easy, cheap, effective, rugged, and safe (QuEChERS) sample preparation and liquid chromatography-tandem mass spectrometry (LC-MS/MS) detection. The average recoveries of cloransulam-methyl in soybean matrices and soil ranged from 80 to 105%, with RSDs between 3-11%. The limit of detection (LOD) was 0.001 mg kg(-1) for soybean grain, plant, and soil and was 0.005 mg kg(-1) for soybean straw. This method was then used to characterize dissipation of cloransulam-methyl in soybeans and soil from three locations in China for the first time. Cloransulam-methyl dissipated quickly in soybean plant with half-lives (T1/2) of 0.21-0.56 days. The dissipation dynamic in soil was characterized using both first-order kinetics model and two-compartment model, and the half-lives were similar, ranging from 0.44 to 5.53 days at three experimental sites in 2012 and 2013. The final residue data showed a very low level of cloransulam-methyl in soil (≤0.026 mg kg(-1)), soybean grain (≤0.001 mg kg(-1)), and straw (≤0.005 mg kg(-1)) samples at harvest time. With the faster and simple analytical method on soybean and soil, rapid dissipation of cloransulam-methyl was observed at three geospatial locations in China, and the terminal residue levels were negligible, so mammalian ingestion exposure is minimal.
authors.affiliation: College of Science, China Agricultural University, Beijing, 100193, China.
authors.forename: Zihao
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: College of Science, China Agricultural University, Beijing, 100193, China.|Institute of Quality Standards and Testing Technology for Agro-Products, Xinjiang Academy of Agricultural Sciences, Xinjiang, 830091, China.
authors.forename: Minghui
authors.initials: M
authors.lastname: Li
authors.affiliation: College of Science, China Agricultural University, Beijing, 100193, China.
authors.forename: Mengyuan
authors.initials: M
authors.lastname: Feng
authors.affiliation: College of Science, China Agricultural University, Beijing, 100193, China.
authors.forename: Kechen
authors.initials: K
authors.lastname: Zhu
authors.affiliation: College of Science, China Agricultural University, Beijing, 100193, China. hanlijun2000@163.com.
authors.forename: Lijun
authors.initials: L
authors.lastname: Han
mesh_terms: D001565:Benzoates / Q000032:analysis*; D002681:China; D002853:Chromatography, Liquid; D004784:Environmental Monitoring; D006207:Half-Life; D007700:Kinetics; D010573:Pesticide Residues / Q000032:analysis*; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis*; D013025:Glycine max / Q000737:chemistry; D013449:Sulfonamides / Q000032:analysis*; D053719:Tandem Mass Spectrometry / Q000379:methods
chemical_list: D001565:Benzoates; D010573:Pesticide Residues; D012987:Soil; D012989:Soil Pollutants; D013449:Sulfonamides; C412472:cloransulam-methyl
keywords: Cloransulam-methyl; Dissipation; QuEChERS; Soil; Soybean; Two-compartment model