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Determination of the potassium content of explosive residues using miniaturised isotachophoresis
Author(s) -
Prest Jeff E.,
Beardah Matthew S.,
Baldock Sara J.,
Doyle Sean P.,
Fielden Peter R.,
Goddard Nicholas J.,
Brown Bernard J. Treves
Publication year - 2010
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.201000263
Subject(s) - isotachophoresis , potassium , chemistry , chromatography , strontium , explosive material , sodium , magnesium , barium , caesium , ammonium , analytical chemistry (journal) , electrolyte , inorganic chemistry , organic chemistry , electrode
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.