Translating Carrier Gas Methods for Pesticide Analysis

This application note presents the use of nitrogen (N2) as an alternative carrier gas to helium (He) in gas chromatography (GC) for multi-residue pesticide analysis. The document outlines the design of the atmospheric pressure gas chromatography (APGC) system, which accommodates N2 without compromising performance. It details the necessary adjustments to GC column dimensions to maintain analysis time and chromatographic resolution. The application note describes experiments conducted using a Xevo TQ-XS Mass Spectrometer with the APGC source, demonstrating reliable detection of over 200 pesticides at low concentrations in grape matrices. The methodology includes the use of the Restek EZGC Method Translator tool for adapting GC methods from He to N2. The results indicate that by scaling the column dimensions and optimizing flow rates, N2 can effectively replace He while achieving comparable analysis times and sensitivity. The findings support the viability of N2 as a cost-effective and readily available alternative for GC applications.