Selective Detection of Gas-Phase Aldehydes and Ketones Using Protonated Hydrazine
This article reports the results of the gas phase studies of protonated hydrazine, N2H5+, reactions with different classes of organic compounds in a chemical ionization mass spectrometer (CIMS). We found that saturated aldehydes react with N2H5+, in the presence of a drift field and neutral hydrazine, to form primarily a protonated hydrazone, e.g. formaldehyde reacts to form CH2N2H3+. Unsaturated aldehydes, saturated ketones, and hydroxyl substituted carbonyl compounds react to form protonated hydrazones and association complexes, e.g. N2H5+ · acetone. In the absence of a drift field, methanol, ethanol, and toluene react to form association complexes; otherwise, no reaction occurs. We propose a method of detecting gas-phase aldehydes and ketones using protonated hydrazine, N2H5+, as a reagent ion in a CIMS. The method was demonstrated by measuring three C6 aldehydes released by grass that had been frozen, crushed and thawed. Qualitatively and quantitatively, the results compare favorably with the results of aldehyde emission experiments reported by others.
G. Morrison and C. J. Howard, "Selective Detection of Gas-Phase Aldehydes and Ketones Using Protonated Hydrazine," International Journal of Mass Spectrometry, Elsevier, Sep 2001.
The definitive version is available at http://dx.doi.org/10.1016/S1387-3806(01)00392-X
Civil, Architectural and Environmental Engineering
National Oceanic and Atmospheric Administration
Keywords and Phrases
Aldehyde and Ketone Detection; Gas Phase Ion Chemistry; Plant Emissions; Protonated Hydrazine
Article - Journal
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