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Thiocyanate and nitrite analysis using miniaturised isotachophoresis on a planar polymer chip

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<mark>Journal publication date</mark>7/08/2011
<mark>Journal</mark>Analyst
Issue number15
Volume136
Number of pages7
Pages (from-to)3170-3176
Publication StatusPublished
Early online date14/06/11
<mark>Original language</mark>English

Abstract

A new method has been developed to improve the determination of thiocyanate using isotachophoresis. This method uses complexation with copper(II) as a mechanism for improving the separation of thiocyanate from chlorate and perchlorate. By using a pH of 3.25 the method can also be used to analyse nitrite. Separations were carried out using a miniaturised poly(methyl methacrylate) (PMMA) separation device. Linearity was observed from 1.25 to 75 mg dm−3 with a correlation coefficient of 0.998 for both thiocyanate and nitrite. Limits of detection for these two species were calculated to be 0.8 mg dm−3 and 0.9 mg dm−3 respectively. The method was successfully applied to the analysis of these anions in a range of samples including explosive residues.