Study on Polarographic Catalytic Wave in Vanadium-2-[(5-Bromo-2-Pyridyl)-Azo]5-Diethylaminophenol-Sodium Bromate System

Abstract

Abstract: In a supporting electrolyte containing 4.0×10^-6mol/L5-Br-PADAP, 0.025mol/L NaBrO₃, 0.002mol/L H₂SO₄,0.008mol/L Na₂SO₄(pH=2.40±0.05), a sensitive polarographic catalytic wave of vanadium was obtained by using single-sweep polarography. The peak potential of this wave appears at -0.17V. The change of peak height of derivative wave with concentration of vanadium is linear in the range from 0.04×10^-3ppm to 20 ×10^-3ppm.The method has been successfully applied to the determination of vanadium in tap water and ores. The composition and the condition stability constant of the vanadium(V) complex with 5-Br-PADAPhave been determined. The electrode processes of the catalytic wave may be presented as folios. (这里有图片198903-263-1.gif)

Key words: Vanadium, 2-[5-Bromo-2-pyridyl-azo]-5-diethylaminophenol, Sodium bromate, Polarographic catalytic wave

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Zhang Chengxiao, Gao Peng . Study on Polarographic Catalytic Wave in Vanadium-2-[(5-Bromo-2-Pyridyl)-Azo]5-Diethylaminophenol-Sodium Bromate System[J]. Chem. J. Chinese Universities, 1989, 10(3): 233.

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Study on Polarographic Catalytic Wave in Vanadium-2-[(5-Bromo-2-Pyridyl)-Azo]5-Diethylaminophenol-Sodium Bromate System

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