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A sensitive, selective and rapid method has been developed for the determination μg/L level of vanadium ion based on the rapid reaction of vanadium(V) with 2-(2-quinolylazo)-5-diethylaminophenol (QADEAP) and the solid phase extraction of the colored chelate with C 1 8 cartridge. The QADEAP reacts with V(V) in the presence of citric acid-sodium hydroxide buffer solution (pH = 3.5) and cetyl trimethylammonium bromide (CTMAB) medium to form a violet chelate of a molar ratio 1: 2 (V(V) to QADEAP). This chelate was enriched by solid phase extraction with C 1 8 cartridge and the enrichment factor of 50 was obtained by elution of the chelates from the cartridge with ethanol. The molar absorptivity of the chelate is 1.28 x 10 5 L mol - 1 cm - 1 at 590 nm in the measured solution. Beer's law is obeyed in the range of 0.01-0.6 μg/mL. The detection limit is 0.04 μg/L in the original samples. This method was applied to the determination of vanadium(V) in water and biological samples with good results.

Study on Solid Phase Extraction and Spectrophotometric Determination of Vanadium with 2-(2-Quinolylazo)-5-Diethylaminophenol