摘要
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.
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.
基金
ProjectsupportedbytheNationalNaturalScienceFoundationofChina (No.2 9975 0 0 9)
