Analysis of oxidizer salt mixtures by electrospray ionization mass spectrometry
Article first published online: 5 JAN 2006
Copyright © 2006 John Wiley & Sons, Ltd.
Rapid Communications in Mass Spectrometry
Volume 20, Issue 3, pages 427–432, 15 February 2006
How to Cite
Sigman, M. E. and Armstrong, P. (2006), Analysis of oxidizer salt mixtures by electrospray ionization mass spectrometry. Rapid Commun. Mass Spectrom., 20: 427–432. doi: 10.1002/rcm.2298
- Issue published online: 5 JAN 2006
- Article first published online: 5 JAN 2006
- Manuscript Revised: 13 NOV 2005
- Manuscript Accepted: 13 NOV 2005
- Manuscript Received: 7 SEP 2005
- Counterterrorism and Forensic Science Research Unit of the Federal Bureau of Investigation's Laboratory Division
Binary aqueous mixtures of NaNO3, KNO3 and NaClO4 oxidizers were analyzed using electrospray ionization mass spectrometry. Sodium nitrate solutions were observed to form doubly charged clusters of the type [(NaNO3)n2Na]2+ and [(NaNO3)n2NO3]2−, where n = 11, 13, 15, etc., in addition to singly charged cluster ions that have been reported previously. The identity of the doubly charged clusters was determined by tandem mass spectrometry. Two-component NaNO3KNO3 salt solutions were observed to form cluster ions of the type [(NaNO3)i(KNO3)jNO3]− in the negative ion mode and [(NaNO3)i(KNO3)jNa]+ and [(NaNO3)i(KNO3)jK]+ in the positive ion mode, where i + j = 1, 2, 3 … 10. Two-component solutions of KNO3NaClO4 formed ions of the type [(KNO3)i(NaClO4)j(KClO4)k(NaNO3)lK]+ and [(KNO3)i(NaClO4)j(KClO4)k(NaNO3)lNa]+ in the positive ion mode, where i + j + k + l = 1, 2, 3 … 10. Similar clusters containing excess nitrate and perchlorate to provide the charge are formed in the negative ion mode. In each case, the maximum number of spectral lines for a cluster of size n can be calculated as the number of combinations of nth order (where n = i + j) of N different cation–anion pairs taken with replication and without regard for the ordering of the N cation–anion pairs. The actual number of lines observed may be reduced due to degeneracy of nominal m/z values for some ions. Copyright © 2006 John Wiley & Sons, Ltd.