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Simultaneous determination of vanadium, niobium and tantalum by high-performance liquid chromatography equipped with on-line enrichment using 2-[2-(5-bromoquinolinylazo)]-5-diethylaminophenol as pre-column derivatization reagent

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Abstract.

The chelator 2-[2-(5-bromoquinolinylazo)]-5-diethylaminophenol (5-Br-QADEAP) was synthesized. A method was developed for the simultaneous determination of vanadium, niobium and tantalum as metal–5-Br-QADEAP chelates using rapid column high performance liquid chromatography along with an on-line enrichment technique. Vanadium, niobium and tantalum were pre-column derivatized with 5-Br-QADEAP to form colored chelates. The chelates were separated on a 4.6 × 10 mm, 1.8 µm rapid analytical column with acetonitrile–water (50:50, v/v) containing pH 4.5 phosphate buffer and 0.01 mol L−1 of citrate as the mobile phase. The chelates were separated completely within 2.5 min. The detection limits (S/N = 3) of vanadium, niobium and tantalum are 1.6, 1.6, and 1.8 ng L−1, respectively. This method was applied to the determination of vanadium, niobium and tantalum in alloy steel, water, and geologic samples with good results.

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Authors and Affiliations

  1. Department of Chemistry, Yunnan University, 650091, Kunming, P.R. China

    Ganpeng Li, Qunyan Wei, Qiufen Hu, Zhangjie Huang & Guangyu Yang

  2. Department of Chemistry, Yunnan Institute of the Nationalities, 650031, Kunming, P.R. China

    Ganpeng Li

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  1. Ganpeng Li
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  2. Qunyan Wei
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  3. Qiufen Hu
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  4. Zhangjie Huang
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  5. Guangyu Yang
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Correspondence to Guangyu Yang.

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Li, G., Wei, Q., Hu, Q. et al. Simultaneous determination of vanadium, niobium and tantalum by high-performance liquid chromatography equipped with on-line enrichment using 2-[2-(5-bromoquinolinylazo)]-5-diethylaminophenol as pre-column derivatization reagent. Microchim Acta 158, 95–102 (2007). https://doi.org/10.1007/s00604-006-0667-x

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