Determination of Vanadium, Niobium and Tantalum as Their 2-(2-Pyridylazo)-5-diethylaminophenol Chelates by Reversed-phase HPLC

Abstract

Abstract: Elements V,Nb and Ta have extremely similar chemical properties.They interference seriously with each other in their analysis,and it is difficult to determine the single element.In this paper,2-(2-pyridylazo)-5-diethylaminophenol(PADAP)is used as the precolumn derivative reagent for the first time and the simultaneous determination of V,Nb and Ta has been achieved in 11min at 580 nm on C₁₈column with mathanol-water(50/50, V/V)containing 0.1%tartaric acid and l0 mmol/L pH=5 acetate buffer as the mobile phase.The detection limits are 0.34,0.29 and 7.30 ng/mL for V,Nb and Ta respectively when the ratio of signal to noise is 3.This method is sensitive and has been applied to the analysis of mineral.The results correspond with the certified values and the recoveries of 99.0%─101.1%are obtained.

Key words: Reversed-phase, HPLC, Vanadium, Niobium, Tantalum 2-(2-pyridylazo)-5-diethylaminophenol

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WANG Hong, ZHANG Hua-Shan, QIU Pei-Hong, CHENG Jie-Ke. Determination of Vanadium, Niobium and Tantalum as Their 2-(2-Pyridylazo)-5-diethylaminophenol Chelates by Reversed-phase HPLC[J]. Chem. J. Chinese Universities, 1995, 16(6): 850.

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Determination of Vanadium, Niobium and Tantalum as Their 2-(2-Pyridylazo)-5-diethylaminophenol Chelates by Reversed-phase HPLC

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