On the Study of lndirect Application of Radioactive Nuclei in Analytical Chemistry. Part IV

Present study deals with further extension of the work reported earlier to the determination of bismuth, palladium, and lead. The principle employed is to add excess of oxine and iodide mixture labelled with I¹³¹ to a slightly acidic solution containing the requisite cation and to measure the activity of a portion of the solution with a liquid counter. The loss in activity is a measure of the amount of cation present on the assump­tion that bismuth is precipitated as (C₉H₇ON) H(BH₄) and divalent inns like lead and palladium have compositions like (C₉H₇ON)HMI₅, where M deride for a divalent cation.

Bismuth from 10 mg. to 0.05 mg. has been estimated. Lead and palladium from 10 mg. to 1.0 mg. have thus for been determined. The data lie always within statistical fluctuations.