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Spectrophotometric Determination of Tungsten with 4,5-Di-bromo-2-nitro-phenyIfluorone (Br-ONPF)

Fang Gao

Abstract

The complex of tungsten (Ⅵ) and Br-ONPF is formed in the presence of Triton X-100.The complex is investigated spectrophotometrically in HCl medium of 0.5 N to 2.8N.The molar absorptivity is 9.2 × 10~(14)l·mol~(-1)·cm~(-1) at the wavelength of 534nm under the experiment condition.Beer's law is obeyed for tungsten (Ⅵ)of 2 to 46 jug in measuring flask of 25ml.The equilibrium of the formation of the complex is reached immediately and the complex gives the stable reddish color for at least 2 hours.Most of the metal ions do not interfer with the determination.It is estimated that the molar ratio of the complex is 1∶2 to tungsten and Br-ONPF.The determination of alloy shows the satisfactory result.

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Key concepts: Molar absorptivity, Tungsten, Chemistry, Spectrophotometry, Molar ratio, Metal ions in aqueous solution, Ion, Metal