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1988•Journal of Shanghai Normal UniversityRequires access

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

I Dong

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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 45 μg 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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What this paper is about

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 45 μg 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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Available 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 45 μg 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.

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

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Spectrophotometric Determination of Tungsten with 4,5-Di-bromo-2-nitro-phenylfluorone (Br-ONPF) — Research Paper | ScholarLens