Studies on the Analytical Application of Onium Compounds. VIII:Spectrophotometric Determination of Cobalt as Tetraphenylphosphonium Cobaltothiocyanate

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This investigation deals with the application of tetraphenylphosphonium chloride as a quantitative reagent for cobalt by polarographic and spectrophotometric methods. The reagent gives clearblue colored precipitate by the reaction with cobaltothiocyanate complex salt, the precipitate is extracted completely by use of chloroform. The extract showeda maximum absorption at 620mμ and the lightabsorbancy showed no change after standing for 1 week and the determinationis carried out within the errors of 3?5% when the concentration of Co2+ is 72.6 γ/ml. (or Co2+ 3.62γ/ml. CHCl3) to 652. 6γ/ml. (or Co2+ 32. 63γ/ml. CHCl3). The effect of pH on the light absorbancy is not very important. The presence of metal ions, such as Zn2+, Cd2+, Hg2+, Sn2+, Sb3+, Pb2+ and Mn2+ up to an equal weight of 167γ of Co2+ in a solution is not interfering, but interfered by the presence of several γ of Fe3+, Cu2+ and Bi3+.
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