Abstract
An amperometric detector based on the chemical modification of Nafion and indium (III) hexacyanoferrate (II, III) thin film (Nafion/In-CN-Fe) onto a glassy carbon (GC) electrode, was first successfully used for the determination of electroinactive cations (Li+, Na+, K+, Rb+, Cs+, NH4 +) in single column ion chromatography (IC). A set of well-defined peaks of electroinactive cations was obtained. The detection limits of the cations are 8.9 × 10–6 mol/L for Li+, 2.3 × 10–6 mol/L for Na+, 5.2 × 10–6 mol/L for K+, 4.8 × 10–6 mol/L for Rb+, 4.0 ׶10–6 mol/L for Cs+ and 5.3 × 10–6 mol/L for NH4 + at a single-to-noise ratio of 3. The proposed method was quick, sensitive and simple. The cations in rainwater and mineral water were successfully analyzed by this method.
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Received: 11 November 1999 / Revised: 6 January 2000 / Accepted: 10 January 2000
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Xu, Q., Zhang, S., Zhang, W. et al. Amperometric detection studies of Nafion/indium hexacyanoferrate film for the determination of electroinactive cations in ion chromatography. Fresenius J Anal Chem 367, 241–245 (2000). https://doi.org/10.1007/s002160000341
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DOI: https://doi.org/10.1007/s002160000341