Title

Selective Detection of Gas-Phase Aldehydes and Ketones Using Protonated Hydrazine

Abstract

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.

Department(s)

Civil, Architectural and Environmental Engineering

Sponsor(s)

National Oceanic and Atmospheric Administration

Keywords and Phrases

Aldehyde and Ketone Detection; Gas Phase Ion Chemistry; Plant Emissions; Protonated Hydrazine

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2001 Elsevier, All rights reserved.


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