Abstract
A cloud point extraction-chromogenic system for vanadium determination containing 4-(2-thiazolylazo)resorcinol (TAR), H2O2, H2SO4, and Triton X-100 was investigated. Optimal conditions for the formation and extraction of a 1:2:1 (VV:O22−:TAR) ternary complex with an absorption maximum at 569 nm were found: concentration of TAR (4 × 10−5 mol dm−3), concentration of H2O2 (1.2 × 10−4 mol dm−3), pH (ca 2), mass fraction of the surfactant (3.6%), and incubation time (40 min). The molar absorptivity (e569), Sandell’s sensitivity (SS), limit of detection (LOD) and linear working range (LWR) were 7.4 × 104 dm3 mol−1 cm−1, 0.69 ng cm−2, 1.7 ng cm−3 and 6–510 ng cm−3, respectively. The effect of foreign ions was studied. The developed procedure was applied for the spectrophotometric determination of the total vanadium content in spent silica-supported catalysts and a vanadium-containing dietary supplement.
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