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  • Title: Enhanced sensitivity in the analysis of trace organochlorine compounds by negative-ion mass spectrometry with ammonia as reagent gas.
    Author: Chaler R, Vilanova R, Santiago-Silva M, Fernandez P, Grimalt JO.
    Journal: J Chromatogr A; 1998 Oct 09; 823(1-2):73-9. PubMed ID: 9818394.
    Abstract:
    A comparison of the performances of ammonia and methane as reagent gases for the analysis of trace organochlorine compounds by gas chromatography coupled to negative-ion chemical ionization mass spectrometry is performed in the present study. Examples of standard mixtures and human blood samples analyzed with both reagents in scan and selected-ion monitoring mode are shown. Important advantages are observed as a consequence of the use of ammonia. These concern detection and quantitation limits and the lower dependence of sensitivity on the degree of chlorine substitution of the compounds.
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