Spectrophotometric Determination of Cobalt(II) Using a Sulphur, Nitrogen and Oxygen Donor Ligand

Abstract

A simple sensitive spectrophotometric method is proposed for the determination of cobalt(II) using 4-salicylideneamino-3-mercapto-6- methyl-1,2,4-triazine(4H)-5-one as a chromogenic reagent. Accurate and reproducible results were obtained upto 32 ppm of Co(II). The average value of molar absorptivity and Sandell’s sensitivity were computed and are 4.612 × 10² L mol^-1 cm^-1 and 5.5 × 10^-3 μg cm^-2, respectively. The composition of the complex was studied by Job’s method of continuous variation and mole ratio method and is found to be of ML₂ type. Interference of various cations and anions were also studied.