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Optimization and Evaluation of Low-pressure Gas Chromatography–mass Spectrometry for the Fast Analysis of Multiple Pesticide Residues in a Food Commodity by Kateřina Maštovská; Steven J Lehotay; Jana Hajšlová is a Chemistry article available to read on EtoBox.

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A fast method of analysis for 20 representative pesticides was developed using low-pressure gas chromatography-mass spectrometry (LP-GC-MS). No special techniques for injection or detection with a common quadrupole GC-MS instrument were required to use this approach. The LP-GC-MS approach used an analytical column of 10 m30.53 mm I.D., 1 mm film thickness coupled with a 3 m30.15 mm I.D. restriction capillary at the inlet end. Thus, the conditions at the injector were similar to conventional GC methods, but sub-atmospheric pressure conditions occurred throughout the analytical column (MS provided the vacuum source). Optimal LP-GC-MS conditions were determined which achieved the fastest separation with the highest signal / noise ratio in MS detection (selected ion monitoring mode). Due to faster flow-rate, thicker film, and low pressure in the analytical column, this distinctive approach provided several benefits in the analysis of the representative pesticides versus a conventional GC-MS method, which included: (i) threefold gain in the speed of chromatographic analysis; (ii) substantially increased injection volume capacity in toluene; (iii) heightened peaks with 2 s peak widths fo

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Author

Kateřina Maštovská; Steven J Lehotay; Jana Hajšlová

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1873-3778)

Published

2001

Language

EN

Field

Chemistry (Physical Sciences)