Multi-residues Analysis of Pesticides using Gas Chromatography Mass Spectrometry: 1- Leafy Vegetables
Al-Dossari, 2M.T. Selim, 'M.H. EL-Saeid and 2I.M. . 2011
The aim of this study is to monitor the pesticide residues in leafy vegetable and to develop the efficient Liquid Chromatography for the extraction and GC/MS for the analysis of investigated
86 pesticides in leafy vegetables. More than 550 samples of leafy vegetables have been collected from Riyadh, Al-Tamer vegetables market, one of the three major fruit and vegetable markets in Riyadh, Saudi Arabia during two years, i.e., 2007-2008. A multi-residue analysis method was developed and described for simultaneously determination of 86 pesticides commonly used in crops, usmg a broad range of physico-chemical properties in leafy vegetables related to Organophosphorous, Organochlorines, Pyrethroids and Carbamates which commonly used in agriculture commodities. Good sensitivity and selectivity of the method were obtained with the limits of quantification 0.0001 mg kg-1 in almost of all. The method was satisfactorily applied to routine analysis as a complement to traditional GC-MS method and the limit of detection was generally 10-20 times lesser than the Maximum Residue Levels (MRLs) established by Codex Alimentarius Commission. Pesticide residues were detected in 24.69% of the tested samples (140 samples from the total of 567 samples). Meanwhile, the detected pesticides concentration had been exceeded the MRL in 18.34% of the total tested samples under this investigation.
The aim of this study is to monitor the pesticide residues in leafy vegetable and to develop the efficient Liquid Chromatography for the extraction and GC/MS for the analysis of …