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  • Title: [Study on solid phase extraction and spectrophotometric determination of vanadium in environmental samples with 2-(2-quinolinylazo)-1,3-dihydroxidebenzene].
    Author: Cui Y, Zhang X, Zhai P, Hu Q, Yin J, Yang G.
    Journal: Wei Sheng Yan Jiu; 2004 Sep; 33(5):625-7. PubMed ID: 15612498.
    Abstract:
    Based on the color reaction of 2-(2-quinolinylazo)-1,3-dihydroxidebenzene (QADHB) with vanadium (v) and the solid phase extraction of its colored complex with C18 cartridge, a new method for the determination of vanadium was studied. In the presence of CTMAB and citric acid-sodium hydroxide buffer solution (pH 3.5) medium. QADHB reacts with vanadium(II) to form a stable 2:1 complex. The colored complex was extracted by C18 cartridge and eluted the retained chelate from cartridge with ethanol (containing 2% of acetic acid), then can be determined by spectrophotometry at 552 nm. Beer's law is obeyed in range of 0-1.0 mg/l. This method can be applied to the determination of vanadium in environmental samples with good results.
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