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

DI Junwei, WU Ying, TU Yifeng, BI Shuping

doi:10.2116/analsci.18.125

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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抄録

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 W^VI, and was conveniently applied to analyses of some tungsten ores containing Mo^VI with satisfactory results.