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Rapid chloride analysis using miniaturised isotachophoresis

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<mark>Journal publication date</mark>30/06/2006
<mark>Journal</mark>Journal of Chromatography A
Issue number1-2
Volume1119
Number of pages5
Pages (from-to)183-187
Publication StatusPublished
Early online date1/12/05
<mark>Original language</mark>English

Abstract

A new design of miniaturised separation device for performing isotachophoresis (ITP) has been produced. The device contains a simple arrangement of channels comprising a single separation channel with a ‘double T’ injection geometry. The device was produced in poly(methyl methacrylate) and incorporates an on-column conductivity detector. A new electrolyte system was developed to enable the rapid determination of chloride to be made. This electrolyte system uses a leading ion of 3.5 mM nitrate at pH 3.0 with 0.5 mM indium(III) added as a complexing agent. Use of this electrolyte system with the new separation device allowed chloride samples to be analysed in under 100 s, with a limit of detection (LOD) calculated to be 2.2 mg l−1.