- P-ISSN 1225-0163
- E-ISSN 2288-8985
A selective method for the determination of iron(III) ion with a sodium dodecyl sulfate(SDS) modified glassy carbon electrode was proposed. It was based on the electrostatic attraction and complexation of the SDS modifier, <TEX>$(DS^-)_n-Fe^{3+}$</TEX>. The determination of iron(III) ion was performed by a differential pulse voltammetry(DPV), and the reduction peak potential of <TEX>$(DS^-)_n-Fe^{3+}$</TEX> was +0.466(<TEX>${\pm}0.002$</TEX>)V vs. Ag/AgCl. For the determination of iron(III) ion, a linear calibration curve was obtained within the iron(III) ion concentration range of <TEX>$0.50{\times}10^{-5}{\sim}10{\times}10^{-5}mol/L$</TEX>, and the detection limit was <TEX>$0.14{\times}10^{-5}mol/L$</TEX>. <TEX>$Cu^{2+}$</TEX>, <TEX>$Ni^{2+}$</TEX>, <TEX>$Co^{2+}$</TEX>, <TEX>$Pb^{2+}$</TEX>, <TEX>$Zn^{2+}$</TEX>, and <TEX>$Mn^{2+}$</TEX> showed little or no effect on the determination of iron(III) ion, respectively. But, ion such as each <TEX>$CN^- $</TEX> and <TEX>$SCN^-$</TEX> interfered seriously.