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Identification of inorganic ions in post-blast explosive residues using portable CE instrumentation and capacitively coupled contactless conductivity detection

Citation

Hutchinson, JP and Johns, CA and Breadmore, MC and Hilder, EF and Guijt, RM and Lennard, C and Dicinoski, GW and Haddad, PR, Identification of inorganic ions in post-blast explosive residues using portable CE instrumentation and capacitively coupled contactless conductivity detection, Electrophoresis, 29, (22) pp. 4593-4602. ISSN 0173-0835 (2008) [Refereed Article]

DOI: doi:10.1002/elps.200800226

Abstract

Novel CE methods have been developed on portable instrumentation adapted to accommodate a capacitively coupled contactless conductivity detector for the separation and sensitive detection of inorganic anions and cations in post-blast explosive residues from homemade inorganic explosive devices. The methods presented combine sensitivity and speed of analysis for the wide range of inorganic ions used in this study. Separate methods were employed for the separation of anions and cations. The anion separation method utilised a low conductivity 70mM Tris/70mM CHES aqueous electrolyte (pH 8.6) with a 90 cm capillary coated with hexadimethrine bromide to reverse the EOF. Fifteen anions could be baseline separated in 7 min with detection limits in the range 27-240 μg/L. A selection of ten anions deemed most important in this application could be separated in 45 s on a shorter capillary (30.6 cm) using the same electrolyte. The cation separation method was performed on a 73 cm length of fused-silica capillary using an electrolyte system composed of 10mM histidine and 50mM acetic acid, at pH 4.2. The addition of the complexants, 1 mM hydroxyisobutyric acid and 0.7mM 18-crown-6 ether, enhanced selectivity and allowed the separation of eleven inorganic cations in under 7 min with detection limits in the range 31-240 μg/L. The developed methods were successfully field tested on post-blast residues obtained from the controlled detonation of homemade explosive devices. Results were verified using ion chromatographic analyses of the same samples. © 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Item Details

Item Type:Refereed Article
Research Division:Chemical Sciences
Research Group:Analytical Chemistry
Research Field:Separation Science
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Chemical Sciences
Author:Hutchinson, JP (Dr Joseph Hutchinson)
Author:Johns, CA (Dr Cameron Johns)
Author:Breadmore, MC (Professor Michael Breadmore)
Author:Hilder, EF (Professor Emily Hilder)
Author:Guijt, RM (Dr Rosanne Guijt)
Author:Dicinoski, GW (Associate Professor Gregory Dicinoski)
Author:Haddad, PR (Professor Paul Haddad)
ID Code:55256
Year Published:2008
Web of Science® Times Cited:61
Deposited By:Chemistry
Deposited On:2009-03-06
Last Modified:2014-11-20
Downloads:0

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