Analysis of chloride, bromide and iodide using miniaturised isotachophoresis on a planar polymer chip.
A new method has been developed to allow the determination of the halide anions chloride, bromide and iodide using isotachophoresis. This method employs a new electrolyte system which incorporates the novel application of indium(III) as a complexing agent. This electrolyte system was devised based on the findings of an investigation into the potential for using indium(III) as a complexing counter ion to selectively manipulate the effective mobilities of halide ions. A leading electrolyte incorporating 3.5 mmol dm(-3) of indium(III) allowed the simultaneous determination of chloride, bromide and iodide to be successfully achieved. The new procedure allows such separations to be made without interference from common inorganic anions such as sulfate and nitrate. Separations were performed using a miniaturised planar poly(methyl methacrylate) chip with integrated platinum wire conductivity detection electrodes. Using this instrumentation the limits of detection were calculated to be 0.7 mg dm(-3), 1.7 mg dm(-3) and 2.2 mg dm(-3) for chloride, bromide and iodide respectively.
Prest
Jeff E
JE
School of Chemical Engineering and Analytical Science, The University of Manchester, PO Box 88, Manchester, UK M60 1QD. j.prest@manchester.ac.uk
Baldock
Sara J
SJ
Fielden
Peter R
PR
Goddard
Nicholas J
NJ
Treves Brown
Bernard J
BJ
D000838:Anions / Q000032:analysis*; D001965:Bromides / Q000032:analysis; D002712:Chlorides / Q000032:analysis; D004586:Electrophoresis / Q000295:instrumentation* / Q000379:methods; D007454:Iodides / Q000032:analysis; D046210:Microfluidic Analytical Techniques; D008904:Miniaturization; D014874:Water Pollutants, Chemical / Q000032:analysis*
D000838:Anions; D001965:Bromides; D002712:Chlorides; D007454:Iodides; D014874:Water Pollutants, Chemical