Dissipation rates and final residues of kresoxim-methyl in strawberry and soil

Bull Environ Contam Toxicol. 2013 Feb;90(2):264-7. doi: 10.1007/s00128-012-0952-9. Epub 2013 Jan 1.

Abstract

In order to study the dissipation rates and final residues of kresoxim-methyl in strawberry and soil, two independent filed trials were performed in Beijing China. The application rates are set at 195 g of active gradient per hectare. A simple analytical method has been developed for the determination of kresoxim-methyl in strawberry and soil. Kresoxim-methyl residues were extracted with acetonitrile from strawberry and soil samples which is determined by gas chromatography coupled with mass spectrometry detection (GC-MSD). The recoveries of kresoxim-methyl in strawberry and soil were observed from 78.9 % to 104.5 % at fortification levels of 0.01-0.5 mg/kg with relative standard deviations of 4.3 %-7.3 %. The reported limits of detection were 0.05 and 0.01 mg/kg for strawberry and soil, respectively. The results showed that kresoxim-methyl dissipation in strawberry could be described as first-order equation with the half-life time of 6.24 and 6.91 days. 14 days later, the dissipation rate is 84.9 % and 83.3 %, respectively. The final residues of kresoxim-methly in the strawberry were in the range of 2.7-4.8 mg/kg at pre-harvest intervals of 1, 3, 5, 7 days which is below the Japan maximum residue limits (MRLs) standards (5 mg/kg in strawberry).

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Fragaria / metabolism*
  • Fungicides, Industrial / pharmacokinetics*
  • Gas Chromatography-Mass Spectrometry
  • Half-Life
  • Limit of Detection
  • Methacrylates / pharmacokinetics
  • Phenylacetates / pharmacokinetics*
  • Reproducibility of Results
  • Soil Pollutants / pharmacokinetics*
  • Strobilurins

Substances

  • Fungicides, Industrial
  • Methacrylates
  • Phenylacetates
  • Soil Pollutants
  • Strobilurins
  • kresoxim-methyl