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In this research, a glassy carbon electrode modified with the functionalized multi-wall carbon nanotubes(MWNT-COOHs) film was used as an amperometric sensor for the determination of S_2O~(2-)_3, SO~(2-)_3, I~- and SCN~-. The electrochemical behavior of those oxidizable inorganic anions at this modified electrode was studied by means of cyclic voltammetry(CV). The experimental results indicate that the modified electrode exhibits a high electrocatalytic activity towards the oxidation of those anions with a relatively high sensitivity, a good stability and a long-life. Separated by ion chromatography(IC) with 1.25 mmol/L H_2SO_4 as an eluent, those oxidizable anions can be determined by the MWNT-COOHs modified electrode successfully. Under the optimal chromatographic conditions, the detection limits are 1.5×10~(-7) mol/L for S_2O~(2-)_3, 2.5×10~(-7) mol/L for SO~(2-)_3, 1.2×10~(-7) mol/L for I~- and 2.0×10~(-7) mol/L for SCN~-, respectively. The method was applied successfully to the determination of those anions in environmental water
In this research, a glassy carbon electrode modified with the functionalized multi-wall carbon nanotubes (MWNT-COOHs) film was used as an amperometric sensor for the determination of S_2O_2, SO_2_3, I ~ and SCN ~ -. The electrochemical behavior of those oxidizable inorganic anions at this modified electrode was studied by means of cyclic voltammetry (CV). The experimental results that the modified electrode exhibits a high electrocatalytic activity towards the oxidation of those anions with a relatively high sensitivity, a good stability and a long-life. Separated by ion chromatography (IC) with 1.25 mmol / L H 2 SO 4 as an eluent, those oxidizable anions can be determined by the MWNT-COOHs modified electrode successfully. the detection limits are 1.5 × 10 ~ (-7) mol / L for SO_ (2 -) _3, 2.5 × 10 ~ (-7) mol / L for SO_2 ~ (-7) mol / L for I ~ - and 2.0 × 10 ~ (-7) mol / L for SCN ~ -, respectively. The method was applied successfully to the determination of those anions in environmental water