Determination of pesticide residues in peaches by using gas chromatography and mass spectrometric detection |
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Authors: | Abdul Samad Muhammad Munir Shahid Karam Ahad |
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Affiliation: | 1. National Pesticides Residues Monitoring System in Pakistan, Ecotoxicology Research Program, NARC, Islamabad, Pakistan;2. Planning and Development Division, Pakistan Agricultural research Council (PARC), Islamabad, Pakistan |
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Abstract: | ABSTRACTA multi-residue method using selected ion monitoring mode GC-MSD has been developed for the quantitative analysis of 30 widely used pesticides in fresh peaches produced in Swat Malakand, Pakistan. The planned methodology involved a sample extraction procedure using liquid-liquid partition with acetonitrile followed by a clean-up step based on solid-phase extraction (SPE). Method validation was performed in accordance with European Union guidelines. The European Union criteria (recovery 70–120%, RSD <20%) were met for majority of pesticides. For most of the pesticides, signal-to-noise ratios were good and background-corrected mass spectra often contained sufficient diagnostic to enable identity and confirmation. The limits of quantification (LOQs) were in the range 0.01–1.0 mg/kg. The above method was successfully applied to the analysis of peach samples (n = 30) from the field. Pesticide concentration in real peach samples was compared with the maximum residue levels (MRLs). Pesticide residues were detected in 73% of the peach samples. Most frequent residues were metalaxyl, α-cypermethrin, azoxystrobin, dimethoate, tebuconazol, λ-cyhalothrin and spiromesifin in peach samples. |
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Keywords: | Pesticides residues solid-phase extraction peach validation GC-MSD MRLs |
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