title: Dissipation and residue of metalaxyl and cymoxanil in pepper and soil.
abstract: A simple and accurate method of determining metalaxyl and cymoxanil in pepper and soil was developed by ultra-performance liquid chromatography-photodiode array detection. The limits of detection were 0.015 mg/kg for metalaxyl and 0.003 mg/kg for cymoxanil. The limits of quantification were 0.05 mg/kg for metalaxyl in pepper and soil as well as 0.01 mg/kg for cymoxanil in pepper and soil. Recoveries of pepper and soil were investigated at three spiking levels and ranged within 77.52 to 102.05 % for metalaxyl and 87.15 to 103.21 % for cymoxanil, with relative standard deviations below 9.30 %. For field experiments, the half-lives of metalaxyl were 3.2 to 3.9 days in pepper and 4.4 to 9.5 days in soil at the three experimental locations in China. At harvest, pepper samples were found to contain metalaxyl and cymoxanil well below the maximum residue limit MRLs of the European Union (EU) following the recommended dosage and the interval of 21 days after last application.
authors.affiliation: State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang, 550025, People's Republic of China.
authors.forename: Xiangyun
authors.initials: X
authors.lastname: Liu
authors.forename: Yan
authors.initials: Y
authors.lastname: Yang
authors.forename: Ying
authors.initials: Y
authors.lastname: Cui
authors.forename: Huijun
authors.initials: H
authors.lastname: Zhu
authors.forename: Xiong
authors.initials: X
authors.lastname: Li
authors.forename: Zhining
authors.initials: Z
authors.lastname: Li
authors.forename: Kankan
authors.initials: K
authors.lastname: Zhang
authors.forename: Deyu
authors.initials: D
authors.lastname: Hu
mesh_terms: D000081:Acetamides / Q000032:analysis / Q000737:chemistry*; D000409:Alanine / Q000031:analogs & derivatives* / Q000032:analysis / Q000737:chemistry; D002853:Chromatography, Liquid; D004784:Environmental Monitoring; D005062:European Union; D006207:Half-Life; D010573:Pesticide Residues / Q000032:analysis / Q000737:chemistry; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry*; D014675:Vegetables / Q000737:chemistry*
chemical_list: D000081:Acetamides; D010573:Pesticide Residues; D012987:Soil; D012989:Soil Pollutants; C028175:metalaxyl; C025644:2-cyano-N-((ethylamino)carbonyl)-2-(methoxyimino)acetamide; D000409:Alanine