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

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Hutchinson, JP and Johns, CA and Breadmore, MC and Hilder, EF and Guijt, RM and Lennard, C and Dicinoski, GW and Haddad, PR (2008) 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

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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 70 mM Tris/70 mM 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 ug/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 10 mM histidine and 50 mM acetic acid, at pH 4.2. The addition of the complexants, 1 mM hydroxyisobutyric acid and 0.7 mM 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 ug/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.

Item Type: Article
Keywords: Contactless conductivity detection • Homemade explosive devices • Inorganic anions and cations • Portable CE • Post-blast residues
Journal or Publication Title: Electrophoresis
Page Range: pp. 4593-4602
ISSN: 0173-0835
Identification Number - DOI: 10.1002/elps.200800226
Additional Information: The definitive published version is available online at: http://interscience.wiley.com
Date Deposited: 21 Dec 2008 23:19
Last Modified: 18 Nov 2014 03:54
URI: http://eprints.utas.edu.au/id/eprint/8143
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