Determination of the potassium content of explosive residues using miniaturised isotachophoresis

A new method has been developed to allow the determination of potassium in post‐explosion residues to be made using miniaturised isotachophoresis. The method is based on the use of a caesium leading ion with 4.5 mM 18‐crown‐6 ether added to retard the potassium to allow reliable determinations to be...

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Bibliographic Details
Published in:Electrophoresis 2010-11, Vol.31 (22), p.3775-3782
Main Authors: Prest, Jeff E, Beardah, Matthew S, Baldock, Sara J, Doyle, Sean P, Fielden, Peter R, Goddard, Nicholas J, Brown, Bernard J. Treves
Format: Article
Language:English
Subjects:
Calcium
Cations - analysis
Combustion
Crown Ethers - chemistry
Electrophoresis, Microchip - instrumentation
Electrophoresis, Microchip - methods
Ethers
Explosions
Explosive Agents - chemistry
Explosive residues
Inorganic cations
Isotachophoresis
Isotachophoresis - instrumentation
Isotachophoresis - methods
Linear Models
Magnesium
Miniaturisation
Potassium
Potassium - analysis
Residues
Sensitivity and Specificity
Sodium
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Summary:A new method has been developed to allow the determination of potassium in post‐explosion residues to be made using miniaturised isotachophoresis. The method is based on the use of a caesium leading ion with 4.5 mM 18‐crown‐6 ether added to retard the potassium to allow reliable determinations to be made. With the conditions selected no interference was noted from other small inorganic cations, such as ammonium, barium, calcium, magnesium, sodium or strontium. The method was successfully applied to the analysis of seven samples containing explosive residues obtained from the unconfined burning of several flash powders. The procedure was found to offer good linearity for potassium determinations over the concentration range of 1.25-150 μg/mL with a coefficient of determination of 0.999 achieved.
ISSN:0173-0835
1522-2683
1522-2683
DOI:10.1002/elps.201000263