A centrifuge-less cloud point extraction-spectrophotometric determination of copper(II) using 6-hexyl-4-(2-thiazolylazo)resorcinol
| Autor: | Kiril B. Gavazov, Petya Racheva, Fatma Neval Genç, Nikolina P. Milcheva |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
02 engineering and technology
Resorcinol 010402 general chemistry 01 natural sciences Polyethylene Glycols Analytical Chemistry chemistry.chemical_compound Instrumentation Spectroscopy Detection limit Cloud point Chemistry Extraction (chemistry) Resorcinols 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics 0104 chemical sciences Spectrophotometry Reagent Absorption (chemistry) 0210 nano-technology Azo Compounds Ammonium acetate Copper Stoichiometry Nuclear chemistry |
| Zdroj: | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 262:120106 |
| ISSN: | 1386-1425 |
| DOI: | 10.1016/j.saa.2021.120106 |
| Popis: | A simple, cheap, and environmentally friendly centrifuge-less cloud point extraction procedure was developed for the preconcentration of traces of Cu(II) before its spectrophotometric determination. It is based on a complexation reaction with the hydrophobic azo reagent 6-hexyl-4-(2-thiazolylazo)resorcinol (HTAR), in which a complex with a stoichiometric ratio of 1:1 and an absorption maximum at 535 nm is formed. The experimental conditions for Cu(II) determination were found: HTAR concentration (8 × 10−6 mol mL−1), mass fraction of the surfactant Triton X-114 (2.2%), pH (5.9, ammonium acetate buffer), and incubation time (10 min at 60 °C). The linear range, limit of detection, molar absorption coefficient and preconcentration factor were calculated to be 4.5–254 ng mL−1, 1.34 ng mL−1, 2.54 × 105 L mol−1 cm−1, and 10, respectively. The effect of foreign ions was studied, and the proposed procedure was applied to the analysis of water samples and a saline solution for intravenous infusion. |
| Databáze: | OpenAIRE |
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