A simple cloud point extraction-spectrophotometric method for total vanadium determination using 4-(2-thiazolylazo)resorcinol and H2O2
| Autor: | Nikolina P. Milcheva, Kiril B. Gavazov, Danail Georgiev Hristov, Fatma Neval Genç |
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| Rok vydání: | 2019 |
| Předmět: |
Detection limit
Cloud point General Chemical Engineering Extraction (chemistry) Vanadium chemistry.chemical_element Tar 02 engineering and technology General Chemistry Resorcinol Molar absorptivity 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry Industrial and Manufacturing Engineering 0104 chemical sciences chemistry.chemical_compound chemistry Materials Chemistry 0210 nano-technology Mass fraction Nuclear chemistry |
| Zdroj: | Chemical Papers. 74:1891-1901 |
| ISSN: | 1336-9075 2585-7290 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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