Simultaneous Determination of Cobalt and Iron Made Easy: Results from HPSAM

A novel protocol using H-point standard addition method (HPSAM) has been developed for simultaneous determination of cobalt and iron metals. We have herein focused on measurement of concentration of an analyte (cobalt) in the presence of other serving as the interfering species (iron). 4-[3-hydroxy-3-(4-methylphenyl) triaz-1-ene-1-yl] benzene sulfonamide (HTSN) was employed as the reagent in the presence of Triton x-100 which served as surfactant). The analytical signals were measured using two different wavelengths, l1(390) and l2(418). The analytical utility of adopted method has been tested and verified under the optimized conditions such as-pH of the medium, colour development of complex and reagent concentration etc. The molar absorptivity was found to be74413 and 41691 L mol-1 cm-1 with excellent root mean square value 0.9992 and 0.9984 for Co (II) and Fe (III), respectively. The RSD values were1.01 and 2.56 for Co and Fe, respectively. The whole methodology is simple, rapid and cost effective. We have successfully applied this method the analysis of Co (II) and Fe (III) in synthetic samples.