Application of nafion/cobalt hexacyanoferrate chemically modified electrodes for the determination of electroinactive cations by ion chromatography

作者：Xu JM; Xian YZ; Shi GY; Li JH; Jin LT^*

来源：Chinese Journal of Chemistry, 2002, 20(8): 771-776.

DOI：10.1002/cjoc.20020200812

• ion chromatography
• electrochemical detection
• water analysis

An amperometric detector based on the chemical modification of Nafion and cobalt (II) hexacyanoferrate (II, III) thin Mm (Nafion/Co-CN-Fe) onto a glassy carbon (GC) electrode was firstly developed for the determination of electroinactive cations (Li+, Na+, K+, Rb+, Cs+ and NH4+) in single column ion chromatography. A set of well-defined peaks of electroinactive cation was obtained. The relative standard deviations (RSDs) of chromatographic peak height (nA) for these cations were all below 3.8%. The cations were detected conveniently in the linear concentration range of 6.0 x 10(-6)-5.0 x 10(-3) mol/L and their correlation coefficients were all above 0.99. The detection limits of the cations were 9.2 x 10(-6) mol/L for Li+, 3.4 x 10(-6) mol/L for Na+, 6.3 x 10(-7) mol/L for K+, 7.8 x 10(-7) mol/L for Rb+, 6.2 x 10(-7) mol/L for Cs+ and 6.2 x 10(-6) mol/L for NW, at a signal-noise ratio of 3. The method was quick, sensitive, simple and was successfully applied to the analysis of rainwater samples. The electrode was stable for a 2 week period of operation with no evidence of chemical or mechanical deterioration.

• 出版日期2002-8
• 单位华东师范大学