NCI Method Indispensable for GC/MS Measurements of Pesticides

Introduction

Electron Ionization (EI) Method GC/MS ionizes compounds and measures their mass numbers. Ionization methods include EI (Electron Ionization) and CI (Chemical Ionization). Typically, the EI method is employed. The EI method produces ions by colliding thermal electrons emitted from a filament with sample gas molecules. This method provides high stability in ionization and the obtained mass spectra show good reproducibility. The EI method provides good results for quantitative analysis as well. Quantitation with GC/MS, in which only ions specific to the compounds are measured, is highly selective analysis method without the affection of interfering components. This Application News introduces an example of analyzing a pesticide on vegetable (tetradifon), with EI method of GC/MS.

August 26, 2004 GMT