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

Asha Lal, Guanhuat Tan, Meekin Chai

Research output: Contribution to journalArticle

16 Citations (Scopus)


A new extraction and cleanup procedure with gas chromatography was developed for the sensitive determination of acephate, dimethoate, malathion, diazinon, quinalphos, chlorpyrifos, profenofos, α-endosulfan, β-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. 2008

Original languageEnglish
Pages (from-to)231-236
Number of pages6
JournalAnalytical Sciences
Issue number2
Publication statusPublished - Feb 2008


All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

Cite this