Abstract
A new analytical method is described for the determination of traces of molybdenum, based on its catalytic activity on the reduction of Fe(III)-tartrate complex with stannous chloride. The determination is carried out by following the decreasing absorbance of the tartrate complex spectrophotometrically (338 nm) at pH 2.0 on a pseudo-first order condition realized. The calibration curve, as constructed by plotting the initial rate constant against Mo(VI) concentration, is linear over the range 0.01 to 0.3 μg of Mo(VI)/ml. Among 40 metal ions examined Ti(IV), Re(VII), Pd(II), Pt(IV), Au(III), As(III), Se(IV), Te(VI), and Te(IV) interfere. The method enables molybdenum in sea water to be determined after separation by ion-exchange with Dowex 1 with an overall precision of 8% on a 300 ml sample basis.
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