Novel Spectrophotometric Method for the Determination of Molybdenum in a PVA Medium.

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  • DI Junwei
    Department of Chemistry, Suzhou University Department of Chemistry, Nanjing University
  • WU Ying
    Department of Chemistry, Suzhou University
  • TU Yifeng
    Department of Chemistry, Suzhou University
  • BI Shuping
    Department of Chemistry, Nanjing University

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Abstract

A novel spectrophotometric method for the determination of trace molybdenum in the presence of a large amount of tungsten was developed. This proposed method was based on the formation of a green charge-transfer polyoxometalate, molybdo-11-tungstophosphate-3,3′,5,5′-tetramethylbenzidine-N-propanesulfonic, which was solubilized and stabilized in a PVA medium; the wavelength of the maximum absorption was at 660 nm. Beer’s law was obeyed in the Mo concentration range of 0.04 - 1.6 µg ml-1. The molar absorptivity was 1.35 × 104 l mol-1 cm-1. The developed method avoided the interference of WVI, and was conveniently applied to analyses of some tungsten ores containing MoVI with satisfactory results.

Journal

  • Analytical Sciences

    Analytical Sciences 18 (2), 125-127, 2002

    The Japan Society for Analytical Chemistry

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