β Scribed by E. Temmerman; F. Verbeek
No coin nor oath required. For personal study only.
A nalylica Cirimicn rlclu Mscvier Publishing Company, Amsterdam l'rinlcd in The Netherlands 505 THE DETERMINATION OF NICKEL, ZINC, COUALT AND MANGANESE IMPURITIES IN CADMIUM BY PULSE I'OLAROGRAPI~Y
Cadmium is often recovcrcd as a by-product of tllc zinc industry. Both clements are ratlier easy separated, but zinc always constitutes a major impurity element in pure cadmium products. Nickel, cobalt and manganese generally arc present in lower amounts.
Emission spectrograplly is frequently used for tllc determination of these and otlier elements. Witllout any separation down to a few p.p.m. can be dctcrmined; after enrichment 0.02-0.05 p.p.m, cobalt and 0.0x-0.05 p.p.m. nickel' and 0.05 p.p.m. nickel, zinc and cobalt in cadmium have been determined". After preliminary separations, colorimctric methods can also be used.
Classical dc. polarography allows the determination of about 20 p.p.rn. of zincs-5 and less than I p.p.m. nickcl"; I ppm. of both elements have been determined by cathode-ray polarograph> r7. Without separation, 20 p.p~n.
zinc has been determined by square-wave polarograpllyfl.
More recently, mass spectroscopic techniques have been developed for the determination of many tr.ace impurities in cadmium sulphide; the detection limits for most impurities are x0 p.p.b."
The present investigation deals with the determination by pulse polarogrnphy of traces of nickel, zinc, cobalt and manganese in cadmium and its compounds. This technique has already been applied for the determination of bismuth, copper and leadlo, thalliumll, antimony, tin and arsenic'" and indiuml" in cadmium products. The reduction waves of nickel( I I), zinc(Il), cobalt(I1) and manganese(I1) were used in the polarographic analysis. These occur at potentials more negative than the cadmium(I1) reduction wave, rendering necessary a prior separation from the cadmium matrix. This was performed by electrolytic deposition of cadmium on mercury at a controlled potential. ESPERIhlENTAL Pulse polarograph, Southern type A 1700 Mark II; the derivative method of operation was usedlo. Electromechanical potentiostat, constructed as described by LRMP~IZD AND Ro~@Rsl4
and providing an output voltage and current of up to 50 V and 5 A respectively. The control sensitivity is f 2 mV.
Mercury-cathode electrolysis cell of the H-type, with fine-porosity sintered A?xzl. Chitit.
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