title: Residues and dissipation of kresoxim methyl in apple under field condition.
abstract: The dissipation and residual levels of kresoxim methyl in apple under field condition were determined by using HPLC-DAD with QuEChERS method. At fortification levels of 0.05, 0.1, 0.5 and 1.0 mg kg(-1) in apple, it was shown that recoveries were ranged from 91.1% to 96.9% with coefficient variation of the method (CV%) for repeatability ranged from 1.27% to 4.77%. The limit of quantification (LOQ) of the method was 0.05 mg kg(-1). The dissipation rates of kresoxim methyl were described by using first-order kinetics and its half-life, as they are ranged from 4.58 to 4.77 days in apple. The terminal residues of kresoxim methyl were below the FAO/WHO maximum residue limit (MRL, 0.2 mg kg(-1)) in apple when measured 14 days after the final application, which suggested that the use of this fungicide was safe for humans. This study would help in providing the basic information for developing regulation to guard a safe use of kresoxim methyl in apple orchard and to prevent health problem from consumers.
authors.affiliation: Pesticide Residues and Environmental Pollution Department, Central Agricultural Pesticide Laboratory, Agricultural Research Center, Dokki, Giza 12618, Egypt. farag_malhat@yahoo.com
authors.forename: Farag
authors.initials: F
authors.lastname: Malhat
authors.forename: Essam
authors.initials: E
authors.lastname: Kamel
authors.forename: Ayman
authors.initials: A
authors.lastname: Saber
authors.forename: Ehab
authors.initials: E
authors.lastname: Hassan
authors.forename: Ahmed
authors.initials: A
authors.lastname: Youssef
authors.forename: Monir
authors.initials: M
authors.lastname: Almaz
authors.forename: Ayman
authors.initials: A
authors.lastname: Hassan
authors.forename: Abd El-Salam
authors.initials: Ael-S
authors.lastname: Fayz
mesh_terms: D002851:Chromatography, High Pressure Liquid; D005506:Food Contamination / Q000032:analysis; D005659:Fungicides, Industrial / Q000737:chemistry*; D006207:Half-Life; D007700:Kinetics; D027845:Malus / Q000737:chemistry*; D008689:Methacrylates / Q000737:chemistry; D010573:Pesticide Residues / Q000737:chemistry*; D010648:Phenylacetates / Q000737:chemistry*; D000073739:Strobilurins
chemical_list: D005659:Fungicides, Industrial; D008689:Methacrylates; D010573:Pesticide Residues; D010648:Phenylacetates; D000073739:Strobilurins; C469328:kresoxim-methyl