Quantitative oxidation of Thiourea and Some of Its Derivatives with Ammonium Hexanitratocerate(IV) Reagent In Nitric Acid Medium at Micro State

R.P.S. Chauhan* and Afshan Syraiya†

P.G. Department of Chemistry,Gaya College, Gaya-823 001, India


An accurate method has been described for the detennination of
thiourea, phenylthiourea, allylthiourea and o-ditolylthiourea at the
mg level with the use of ammonium hexanitratocerate(IV) as the
oxidant. The sample is reacted with an excess of Ce(IV) solution
at room temperature (25°C) for about 30 min, the unreacted Ce(IV)
reagent is then determined by titrating against Fe(II), using ferroin
indicator. The precision and accuracy are within ±1 %.


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  • Asian J. Chem. /
  •  2000 /
  •  12(2) /
  •  pp 375-378