The negative Ion chemical ionization mass spectra for 34 volatile metal chelates are reported. Also a sensitivity study using a gas chromatograph chemical Ionization mass spectrometer computer system comparing detection limits for several Cr(/3-dlketonates)3 in both negative and positive Ion detection modes is described. This study Illustrates the ability of negative ion chemical ionization mass spectrometry to provide two to three orders of magnitude Increase In specific Ion currents for compounds containing electronegative functional groups.Chemical ionization mass spectrometry has been shown to be a potentially sensitive method of analysis for trace metals (1-4). Detection limits in the picogram range have been reported for several of the first, second, and third row transition metals (4). This earlier work used the more

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