Spectrophotometric Determination of Cerium(IV) with Triflupromazine Hydrochloride

Department of Post-graduate Studies and Research in Chemistry, University of Mysore, Manasa Gangotri, Mysore 570 006.

Manuscript received 24 September 1976, revised 19 May 1977, accepted 24 May 1977

Triflupromazine hydroclorlde Is proposed as a new reagent for tbe spectropbotometric determination of cerium(IV). The reagent forms red coloured species with cerium(IV) instantaneously in 2.5-4.0M phosphoric acid. The red species boa absorption maximum at 503 om with molar absorptivity 6.70 x 10⁸ litre mole¹ cm¹. A twenty-fold molar excess of the reagent is necessary for the full development of the colour intensity. Beer's Jaw Is valid over the concentration range 0.4-14.20 ppm of cerium(IV) The effects of acid concentration, time, temperature, order of addition of reagents, reagent concentration and diverse ions are reported. The proposed method offers the advantages of simplicity, selectivity, rapidity and without the need for extraction.