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Application of Nafion/ Cobalt Hexacyanoferrate Chemically Modified Electrodes for the Determination of Electroinactive Cations by Ion Chromatography
Author(s) -
Xu JiMing,
Xian YueZhong,
Shi GuoYue,
Li JinHua,
LiTong Jin
Publication year - 2002
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20020200812
Subject(s) - chemistry , nafion , amperometry , cobalt , glassy carbon , analytical chemistry (journal) , inorganic chemistry , detection limit , electrode , chromatography , electrochemistry , cyclic voltammetry
An amperometric detector based on the chemical modification of Nafion and cobalt (II) hexacyanoferrate (II, III) thin film (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 NH 4 + ) 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 × 10 −6 ‐5.0 × 10 −3 mol/L and their correlation coefficients were all above 0.99. The detection limits of the cations were 9.2 × 10 −6 mol/L for Li + , 3.4 × 10 −6 mol/L for Na + , 6.3 × 10 −7 mol/L for K + , 7.8 × 10 −7 mol/L for Rb + , 6.2 × 10 −7 mol/L for Cs + and 6.2 × 10 −6 mol/L for NH 4 + , 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.