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

Abstract

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 %.