Abstract
The quaternary ammonium salt Aliquat 336 (A336; R4N+Cl-) and the azo dye 4-(2-thiazolylazo)orcinol (ТАО) were examined as constituents of a water-isobutanol extraction-chromogenic system for vanadium(V). Under the optimum conditions (cTAO = 1.6´10-3 mol dm-3, cA336 = 1.3´10-2 mol dm-3 and pH 5.0), vanadium(V) is extracted as a ternary complex which can be represented by the formula (R4N+)[VO2(TAO2-)]. The key extraction-spectrophotometric characteristics were determined. The interfering effect of foreign ions was studied as well. The wavelength of maximum absorption (λmax), molar absorptivity (εmax), constant of extraction (Kex) and fraction extracted (E) were found to be λ = 547 nm, ε = 3.1×104 dm3 mol-1 cm-1, Log Kex = 2.8 and E = 90.2%, respectively. Beer's law was obeyed in the range of 0.084-2.0 mg cm-3 and the limit of detection was 25 ng cm-3 of vanadium(V).
Highlights
Ionic liquids (ILs) possess fascinating properties that are rather different from those of conventional molecular solvents
The present paper aims at to study the liquid-liquid extraction (LLE) of VV in a chromogenic system containing 5-methyl-4-(2-thiazolylazo)resorcinol {4-(2-thiazolylazo)orcinol, ТАО} and
The results show that the composition of the ternary complex is 1:1:1
Summary
Ionic liquids (ILs) possess fascinating properties that are rather different from those of conventional molecular solvents. This make ILs of fundamental interest to specialists in various areas of chemistry and physics.[1,2] The IL Aliquat 336 (A336; R4N+Cl−) finds applications as a surfactant, phase-transfer catalyst and ion-association reagent.[3] The methyltrialkyl(C8-C10)ammonium cations it contains can form hydrophobic ion-associates with various anions and the obtained compounds can be separated by extraction methods, such as liquid-liquid extraction (LLE) and cloud-point extraction. In the absence of a chelating reagent, the extraction equilibrium is established slowly and there are practical problems with the formation of a third phase.[24]
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