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An investigation of the reactions of H3O+ and O2+ with NO, NO2, N2O and HNO2 in support of selected ion flow tube mass spectrometry

✍ Scribed by Patrik Španěl; David Smith

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
75 KB
Volume
14
Category
Article
ISSN
0951-4198

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✦ Synopsis

A selected ion flow tube (SIFT) experimental investigation has been carried out of the reactions of H 3 O , NO and O 2

with NO, NO 2 , N 2 O and HNO 2 , in order to obtain the essential kinetic data for the analyses of these compounds in air using selected ion flow tube mass spectrometry (SIFT-MS). These investigations show that NO ions do not react at a significant rate with any of these NO x compounds and that H 3 O ions react only with HNO 2 (product ions H 2 NO 2 (75%) and NO (25%)). O 2 ions react with NO (product ion NO ), NO 2 (product ion NO 2

) and HNO 2 (product ions NO (75%), NO 2 (25%)), but not with N 2 O. We conclude that both NO and NO 2 can be accurately quantified in air using only O 2 precursor ions and SIFT-MS when HNO 2 is not present. However, when HNO 2 is present it invariably co-exists with both NO and NO 2 and then both H 3 O and O 2 precursor ions are needed to determine the partial pressures of NO, NO 2 and HNO 2 in the air mixture. We also conclude that currently N 2 O cannot be analysed in air using SIFT-MS.

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