Abstract

A highly sensitive and selective spectrophotometeric determination of molybdenum using o-Phenanthroline in presence of thiocyanate

Molybdenum in the pentavalent state, forms a yellow orange colored complex with o-phenanthroline in presence of thiocyanate in hydrochloric acid medium whose absorbance is measured at 415 nm. Ascorbic acid is used as a reductant for converting Mo (VI) to Mo (V). The Ascorbic acid is used as a reductant for converting Mo (VI) to Mo (V). The molar absorptivity and Sandell's sensitivity of the method are 1.151×104 1mol–1cm–1 and ± 0.0041 mg Mo cm–2 respectively. Beer's law holds good up to 5.5 mg Mo ml–1. A large number of cations and anions do not cause interference. The procedure worked out is quite simple, rapid, sensitive and highly selective


Author(s): Sonia Bhardwaj and L. R. Kakkar

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