title: Dissipation behavior of hexaconazole and kresoxim-methyl residues in ginseng and soil under field conditions.
abstract: The dissipation and terminal residues of a fungicide suspension (5% hexaconazole, 25% kresoxim-methyl) in ginseng and soil were investigated by high-performance liquid chromatography coupled with tandem mass spectrometry (HPLC-MS/MS). At fortified levels of 0.01, 0.02, and 0.20 mg kg(-1), the recoveries of hexaconazole and kresoxim-methyl were in the range of 80.6∼94.8% and 82.4∼98.8% with relative standard deviation of 3.42-9.12% and 3.19-8.58%, respectively. The half-lives were 7.09-10.73 days in root, 6.80-7.95 days in stem, 5.31-8.49 days in leaf, and 6.30-7.97 days in soil. The terminal residues were all below the maximum residue limits (MRLs) of EU and South Korea. Risk assessment results indicated that the risk of hexaconazole and kresoxim-methyl use in ginseng at dosage of 60-90 g a.i. ha(-1) was negligible to humans. This work would help the government to establish the MRL and provide guidance on the proper and safe use of hexaconazole and kresoxim-methyl in ginseng.
authors.affiliation: College of Agronomy, Jilin Agricultural University, Changchun, 130118, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Chang
authors.initials: C
authors.lastname: Liu
authors.forename: Jie
authors.initials: J
authors.lastname: Gao
authors.forename: Chunwei
authors.initials: C
authors.lastname: Wang
authors.forename: Lili
authors.initials: L
authors.lastname: Cui
authors.forename: Aijun
authors.initials: A
authors.lastname: Li
mesh_terms: D002851:Chromatography, High Pressure Liquid; D004784:Environmental Monitoring; D005659:Fungicides, Industrial / Q000032:analysis*; D006207:Half-Life; D008689:Methacrylates / Q000032:analysis; D005894:Panax / Q000737:chemistry*; D010573:Pesticide Residues / Q000032:analysis*; D010648:Phenylacetates / Q000032:analysis*; D018515:Plant Leaves / Q000737:chemistry; D018517:Plant Roots / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry; D056910:Republic of Korea; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis; D000073739:Strobilurins; D053719:Tandem Mass Spectrometry; D014230:Triazoles / Q000032:analysis*
chemical_list: D005659:Fungicides, Industrial; D008689:Methacrylates; D010573:Pesticide Residues; D010648:Phenylacetates; D012987:Soil; D012989:Soil Pollutants; D000073739:Strobilurins; D014230:Triazoles; C469328:kresoxim-methyl; C409722:hexaconazole