title: Novel spectrophotometric method for the determination of molybdenum in a PVA medium.
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 microg ml(-1). The molar absorptivity was 1.35 x 10(4) 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.
authors.affiliation: Department of Chemistry, Suzhou University, PR China. jwdi@publicl.sz.js.cn
authors.forename: Junwei
authors.initials: J
authors.lastname: Di
authors.forename: Ying
authors.initials: Y
authors.lastname: Wu
authors.forename: Yifeng
authors.initials: Y
authors.lastname: Tu
authors.forename: Shuping
authors.initials: S
authors.lastname: Bi