Validation of a headspace solid-phase microextraction procedure with gas chromatography-electron capture detection of pesticide residues in fruits and vegetables

Mee Kin Chai, Guan Huat Tan

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Abstract

Headspace solid-phase microextraction (HS-SPME) was evaluated for the determination of pesticide residues in fruits and vegetables by gas chromatography with an electron capture detector (GC-ECD). The fibre used was coated with polydimethylsiloxane (100 μm thickness) and the analytical conditions employed have been developed and optimised in a previous work [Chai, M. K., Tan, G. H., & Asha, L. (2008). Optimisation of headspace solid-phase microextraction for the determination of pesticide residues in vegetables and fruits. Analytical Sciences, 24 (2), 273-276]. The results show that the HS-SPME procedure gave a better linear range, accuracy, precision, detection and quantification limits and is adequate for analysing pesticide residues in fruits and vegetables. The average recoveries obtained for each pesticide ranged between 71% and 98% at three fortification levels with the relative standard deviation of less than 5%. Repeatability (0.3-3.7%) and intermediate precision (0.8-2.5%) were shown to be satisfactory. The limits of detection (0.01-1 μg L-1) and the limits of quantification (0.05-5 μg L-1) of these pesticides were much lower than the maximum residue levels (MRL), allowed for fruits and vegetables in Malaysia.

Original languageEnglish
Pages (from-to)561-567
Number of pages7
JournalFood Chemistry
Volume117
Issue number3
DOIs
Publication statusPublished - 01 Dec 2009

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All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Food Science

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