Abstract
o-Mercaptobenzoic acid is shown to be a sensitive reagent for the determination of cobalt. The reagent forms a bluish voilet complex having maximum absorption at 570 mμ. The color develops at room temperature, with a broad range of pH 5.2–7.2 and is very stable. The method is not sensitive to the concentration of the reagent. Beer's law conforms over the range of 0.29–2.9 ppm of cobalt. Copper, silver, and cadmium are effectively masked with thiourea. Interferences due to bismuth, iron, manganese, molybdenum, nickel, tungsten, and vanadium have been overcome by a simple and rapid separation. The molar absorptivity and Sandell sensitivity are 16.5 × 10 3 and 0.0028 μg/cm 2, respectively. The reagent forms 3:1 complex with cobalt with instability constant of log K = 18.21 at room temperature (25 °C) and ionic strength = 0.1. A procedure for the determination of cobalt is described.
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