Multiresidue analysis of pesticides in fruits and vegetables using solid-phase extraction and gas chromatographic methods

Anal Sci. 2008 Feb;24(2):231-6. doi: 10.2116/analsci.24.231.

Abstract

A new extraction and cleanup procedure with gas chromatography was developed for the sensitive determination of acephate, dimethoate, malathion, diazinon, quinalphos, chlorpyrifos, profenofos, alpha-endosulfan, beta-endosulfan, chlorothalonil and carbaryl using 1-chloro-4-fluorobenzene as an internal standard in fruits and vegetables. Several extracting and eluting solvents for solid-phase extraction were investigated. The overall extracting solvent with a mixture of acetone:ethyl acetate:hexane (10:80:10, v/v/v) and a eluting solvent of 5% acetone in hexane used with the RPC18 cartridge gave the best recovery for all of the investigated pesticides, and minimized the interference from co-extractants. Under the optimal extraction and clean-up conditions, recoveries of 85 - 99% with RSD < 5.0% (n = 3) for most of the pesticides at the 0.02 - 0.5 mg/kg level were obtained. The limit of detection was between 0.005 - 0.01 mg/kg and the limit of quantification was 0.01 mg/kg. This analytical procedure was characterized with high accuracy and acceptable sensitivity to meet requirements for monitoring pesticides in crops.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Chromatography, Gas / instrumentation
  • Chromatography, Gas / methods
  • Food Analysis / instrumentation
  • Food Analysis / methods*
  • Food Contamination / analysis*
  • Fruit / chemistry*
  • Pesticides / analysis*
  • Reproducibility of Results
  • Sensitivity and Specificity
  • Solid Phase Extraction / instrumentation
  • Solid Phase Extraction / methods*
  • Time Factors
  • Vegetables / chemistry*

Substances

  • Pesticides