Coated-wire iron(III) ion-selective electrode based on iron complex of 1,4,8,11-tetraazacyclotetradecane

The work described here comprises the determination of Fe(III) by ion selective potentiometry using a coated-wire ion-selective electrode (CWISE) based on iron-cyclam complex. Linear Nernstian response for this electrode was obtained over the total Fe(III) concentration range of 1 × 10−2 to 1 × 10−6 M in 0.05 M HNO3, H2SO4, HClO4, HCl, KNO3 and KCl media, with a slope of 60 ± 5 mV per decade change. Working pH range of the electrode was found to be 1.3-3.5. Selectivity coefficients of some mono- and divalent metal ions were determined. Analysis of alloys, electroplating bath solutions and pharmaceutical samples have been carried out using this CWISE and the results are found to be comparable with those obtained by using conventional methods.