Summary
Cadmium can be estimated both gravimetrically and volumetrically after precipitation as the Bismuthiol II complex having the composition (C8H5N2S3)2Cd. The complex is stable in the acid range and the best working pH is from 3 to 7. The method affords the separation of cadmium from ions of alkalis, alkaline earths, molybdate, vanadate, tungstate, bismuth, arsenic, antimony, tin, manganese, cobalt, nickel, zinc, and other tri- and tetra-valent elements. Higher amounts of zinc usually coprecipitate. The complex is stable up to a temperature of 315° C. For volumetry, the complexometric method was found to be highly suitable with eriochrome black T as the indicator.
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References
Majumdar, A. K., and B. R. Singh: Z. analyt. Chem. 154, 413 (1957).
Majumdar, A. K., and B. R. Singh: Z. analyt. Chem. 156, 265 (1957).
Treadwell, F. P., and W. T. Hall: Analytical Chemistry, Vol. II. New York: John Wiley and Sons, Inc. 1935, p. 198.
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Part X see Z. analyt. Chem. 161, 81 (1958).
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Majumdar, A.K., Singh, B.R. Bismuthiol II as an analytical reagent. Z. Anal. Chem. 161, 257–260 (1958). https://doi.org/10.1007/BF00463397
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DOI: https://doi.org/10.1007/BF00463397