Abstract
A sample of stored O-ethyl S-[2-(diisopropylamino)ethyl] methylphosphonothiolate (VX), known to contain many impurities, was studied by combined capillary column gas chromatography-mass spectrometry under both electron impact and chemical ionization conditions. More than twenty sample components, many of which were previously unreported, were identified and characterized based on their mass spectral data. Ammonia chemical ionization was particularly useful since this technique provided molecular ion information for all the VX impurities.
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