Abstract
Two liquid-liquid extraction-chromogenic systems for GaIII based on azo dyes (ADs) and xylometazoline hydrochloride (XMH) have been studied. The ADs used were 4-(2-pyridylazo)resorcinol (PAR) and 4-(2-thiazolylazo)resorcinol (TAR). The optimum conditions (pH, AD concentration, XMH concentration, and extraction time) for the formation of ternary complexes of general formula (XMH+)[GaIII(AD2–)2], that are readily extracted into chloroform, have been worked out. The following extraction-spectrophotometric characteristics: absorption maxima (λ), molar absorptivities (eλ), limits of detection (LOD), limits of quantitation (LOQ), constants of extraction (Kex), and fractions extracted (E) have been determined. The system in which AD = PAR has better performance: e512 = 9.9×104 dm3 mol–1 cm–1, LOD = 2.8 ng/cm3, LOQ = 9.4 ng/cm3, log Kex = 4.1, and E = 97%. Extraction equilibrium with this reagent is achieved in a short time (only a few seconds) and the optimum pH interval is broad (5.1–7.8).
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