Chemical ionisation mass spectrometry for the measurement of atmospheric amines

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doi:10.1071/EN12020

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Chemical ionisation mass spectrometry for the measurement of atmospheric amines

Huan Yu ^A and Shan-Hu Lee ^A ^B

^A Kent State University, College of Public Health, Kent, OH 44242, USA.
^B Corresponding author. Email: slee19@kent.edu

Environmental Chemistry 9(3) 190-201 http://dx.doi.org/10.1071/EN12020
Submitted: 31 January 2012 Accepted: 26 April 2012 Published: 20 June 2012





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Environmental context. Amines are of interest to atmospheric chemistry as they may be important gas-phase precursors for secondary aerosol formation. We describe a mass spectrometer for real-time in-situ measurements of gaseous alkyl amines in the atmosphere. This measurement technique will help to evaluate the contribution of amines to the formation of secondary aerosols, including secondary organic aerosol and new particle formation.

Abstract. We describe a chemical ionisation mass spectrometer (CIMS) for the ambient measurement of amines, known as important gas-phase precursors for secondary aerosol formation. Protonated ethanol or acetone ions were used as ionisation reagents to selectively detect high proton affinity base compounds (e.g. amines and NH₃), thereby minimising interferences from other atmospheric gaseous organic compounds. With ethanol as ionisation reagent (~3 × 10⁵ Hz of ion signals), the CIMS showed similar sensitivities (2.1–8.7 Hz pptv^–1) and detection limits (7–41 pptv with a 1-min integration time) for NH₃ and several atmospherically relevant key amine compounds containing one to six carbon atoms (C₁- to C₆-amines and their isomers). The CIMS background signals of the six amines ranged from 9 to 40 pptv, much lower than ~930 pptv for NH₃. The CIMS response times were between 13 and 26 s for these amines. The unique combination of the fast time response, high sensitivities and low detection limits allows the use of this CIMS for real time measurements of atmospheric trace amines. During the ambient measurement made in Kent, OH, in November 2011, the measured mixing ratios of C₂- and C₃-amines were 8 ± 3 (mean ± 1 standard deviation) and 16 ± 7 pptv, whereas those of NH₃ were 517 ± 259 pptv.

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