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DETERMINATION OF THORIUM AND OF ZIRCONIUM BY COMPLEX FORMATION IN MAGNESIUM ALLOY
R.S. Volodarskaya
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Abstract
Arsenaso was found to be the most suitable indicator for the colorimetric determination of thorium with Trilon B, as it forms a stable complex with thorium in strongly acid medium. Magnesium alloys containing up to 4% thorium and up to 1% zirconium were successfully analyzed by this method without inteference by Mg, Zn, Al, Mn, or Cd. The Ce/sup 4+/ must be reduced before the titration. The zirconium is determined by backtitrating the excess of the Trilon B with FeCl/sub 3/ at pH = 2.0 to 2.5 in the presence of sulfosalicylic acid. If both thorium and zirconium are present in the same sample, the zirconium must be separated previously with phenylarsonium acid, completing the zirconium determination in the precipitate by complex formation, titrating it with Trilon B. (TTT)