Abstract
12 By incorporating a new electrochemical detector based on potential gradient detection, a portable capillary electrophoresis (CE) instrument for field analysis has been developed. The portable CE instrument can be used for detecting a broad range of ionizable species in aqueous solutions. The detection limits of the instrument for most ions were around 0.1 ppm with a linear range of three orders of magnitude. Ions in mineral water (K<SUP>+</SUP>, Na<SUP>+</SUP>, Ca<SUP>2+</SUP>, Mg<SUP>2+</SUP>, Cl<SUP>-</SUP>, NO<SUB>3</SUB><SUP>-</SUP>, SO<SUB>4</SUB><SUP>2-</SUP>, CO<SUB>3</SUB><SUP>2-</SUP>) and bromate in drinking water were analyzed as examples with the portable capillary electrophoresis instrument.
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