A spectrophotometric method for the determination of trace amounts of vanadium(V) with sulphochlorophenol N is described. With this reagent, vanadium forms a blue complex, which is stable in the pH range 3.7–6.0. The coloured complex obeys Beer's law at 627 nm in aqueous solution with a molar absorptivity of 3.12 × 104 l mol–1 cm–1. Copper and cobalt ions interfere in this method.
M. Zenki, Analyst, 1979, 104, 323 DOI: 10.1039/AN9790400323
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