Reductive differential-pulse adsorptive stripping voltammetric determination of molybdenum as 12-molybdophosphoric acid or as molybdic acid at a hanging mercury drop electrode

1 January 1988

journal article
research article
Published by Royal Society of Chemistry (RSC) in The Analyst

Vol. 113 (2) , 361-363
https://doi.org/10.1039/an9881300361

Abstract

Molybdenum(VI) has been determined by differential-pulse adsorptive stripping voltammetry in a pH 2 phosphate buffer utilising the strong adsorption of 12-molybdophosphoric acid at a hanging mercury drop electrode. Using a 1 min accumulation time calibration graphs are rectilinear up to the 7 × 10^–7 M molybdenum level. Coefficients of variation at the 7 × 10^–8 M level were typically –9 M level with 2 min accumulation. Molybdenum(VI) can be accumulated as molybdic acid from 10^–2 M sulphuric acid and 10^–2 M pH 4 acetate buffer solutions but the signal sizes are only one-fortieth of that obtained with phosphate buffer.

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