Screening method for pesticides in air by gas chromatography/tandem mass spectrometry

Abstract

A multiresidue method for determining more than 70 pesticides in air has been validated using a single injection with gas chromatography/tandem mass spectrometry (GC/MS/MS). The method validation considered both stages of sampling and analysis. The sampling method, based on active sampling using sorption in sorbent cartidges, was validated by generating standard atmospheres. Performance parameters of the method were evaluated, with a reduction in the limits of quantification by injecting a higher volume of sample extract, and increase of selectivity by the use of MS/MS detection mode. The method was based on solid-phase extraction, which permits a degree of automation. The best adsorbents were found to be Chromosorb 106 and Tenax TA. The retention capacity of these sampling sorbents allows up to 1440 L of air to be sampled without any breakthrough for most of the compounds. Data were generated for assessing the potential exposure of bystanders. The application of the method to the analysis of the air in urban locations near agricultural areas showed that pesticides were present in most of the samples.

Determination of Tetraconazole and Diniconazole Fungicide Residues in Tomatoes and Green Beans by Capillary Gas Chromatography

“…14,22) 3) It is speciˆc for the two compounds, and thus gave the best recovery rate for both, while other methods 6,8,10,11,16,19,28,32,33) used for multipesticide screening are nonspeciˆc for the studied compounds. 4) GC-ECD is comparatively economical, and more available than GC-MS-MS 7,9,10,24,28) or GC-MS. 19,23)…”

“…Estimation of the residual amounts of tetraconazole and diniconazole is largely dependent on GC methods using NPD, 11) FPD, 11,25) ECD, 12,14,25) FTD, 22) TSD, 25) GC-MS, 19,23) or GC/MS/MS, 10,24) although better precision and sensitivity values are obtained with the LP-GC/MS/MS approach (lowpressure tandem mass gas chromatography). 7 9,28) HPLC methods are used to a lesser extent, 4,12,16,26,27) LC/MS is used for both fungicides, 33) and LC/MS/ MS (liquid chromatography tandem mass spectrometry) is also used.…”

Comparison of Gas Chromatography-Mass Spectrometry and Gas Chromatography-Tandem Mass Spectrometry with Electron Ionization and Negative-Ion Chemical Ionization for Analyses of Pesticides at Trace Levels in Atmospheric Samples

“…SRM analyses, particularly when coupled to GC systems, are still emerging and less applications than SIM analysis. The majority of available SRM analyses use electron ionization (Arrebola et al 2003; Haib et al 2003; González et al 2004; Martinez Vidal et al 2004; Garrido Frenich et al 2005; Leandro et al 2005; Yague et al 2005; Ballesteros et al 2006; Fernández Moreno et al 2006; Garrido Frenich et al 2006; Goncalves et al 2006; Garrido Frenich et al 2007; Guardia-Rubio et al 2007). …”

Enrichment/separation of cadmium(II) and lead(II) in environmental samples by solid phase extraction

“…It is a cross-linked polystyrene resin. It has been used on the gas chromatographic analysis of various organic compounds as stationary phase [35][36][37][38][39].…”