A simple cloud point extraction-spectrophotometric method for total vanadium determination using 4-(2-thiazolylazo)resorcinol and H2O2

GENÇ F., Milcheva N. P., Hristov D. G., Gavazov K. B.

Chemical Papers, cilt.74, sa.6, ss.1891-1901, 2020 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 74 Sayı: 6
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1007/s11696-019-01038-8
  • Dergi Adı: Chemical Papers
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core
  • Sayfa Sayıları: ss.1891-1901
  • Anahtar Kelimeler: 4-(2-Thiazolylazo)resorcinol, Cloud point extraction, Hydrogen peroxide, Spectrophotometric determination, Vanadium
  • İstanbul Yeni Yüzyıl Üniversitesi Adresli: Evet

Özet

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:O2 2−: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 (ε569), 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. Graphic abstract: [Figure not available: see fulltext.].