Reactive Uptake of Trimethylamine into Ammonium Nitrate Particles

The reaction of trimethylamine (TMA) vapor with a polydisperse distribution of ammonium nitrate particles (20−500 nm dia.) was studied in a flow tube reactor with particle analysis by laser desorption (1064 nm) 70 eV electron ionization (EI) in an ion trap time-of-flight (IT-TOF) aerosol mass spectr...

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Bibliographic Details
Published in:The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 2009-04, Vol.113 (17), p.4840-4843
Main Authors: Lloyd, Julie A, Heaton, Katherine J, Johnston, Murray V
Format: Article
Language:English
Subjects:
Aerosols - chemistry
Lasers
Mass Spectrometry
Methylamines - chemistry
Nitrates - chemistry
Particle Size
Surface Properties
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Summary:The reaction of trimethylamine (TMA) vapor with a polydisperse distribution of ammonium nitrate particles (20−500 nm dia.) was studied in a flow tube reactor with particle analysis by laser desorption (1064 nm) 70 eV electron ionization (EI) in an ion trap time-of-flight (IT-TOF) aerosol mass spectrometer. When the TMA vapor concentration was very high, essentially complete exchange of TMA for ammonia in the particles was achieved. When the TMA vapor concentration was lower (∼500 ppb for a reaction time of 23 s), partial exchange was observed, and the initial reactive uptake coefficient was estimated to be on the order of 2 × 10−3 at 20% RH. This value suggests that measurable exchange is possible in the atmosphere when particles are exposed to an amine concentration on the order of 1 ppb for a few hours. The effects of particle size, water content, and amine molecular structure on uptake remain to be elucidated.
ISSN:1089-5639
1520-5215
DOI:10.1021/jp900634d