Abstract
THE most accurate methods of estimating platinum in the form of PtCl6= orPtCl4= in aqueous solutions containing no other platinum metals or gold appear to be precipitation as the metal either by formic acid or by oxalic acid in the presence of mercuric sulphate and sulphuric acid. But if one wishes to estimate PtCl6 = in the presence of PtCl4 recourse must be made to precipitating the former as (NH4)2PtCl6 or Cs2PtCl6, and measures required to avoid co-precipitation make such procedures tedious. Comparable accuracy may be obtained in much less time by labelling the cæsium with cæsium-137, and using the radioactivity of this isotope as an ‘indicator’ in a volumetric technique.
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References
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CASEY, A., ROBB, W. Radiometric Titration of the Hexachloro-platinate (IV) Ion. Nature 198, 581–582 (1963). https://doi.org/10.1038/198581b0
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DOI: https://doi.org/10.1038/198581b0
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