Nd(III) spectrophotometric determination in aqueous two-phase system
Abstract
In this work, it was evaluated the Nd(III) spectrophotometric determination using 4-(2-Pyridylazo)resorcinol (PAR) as ligand and its application in an aqueous two-phase system (polymer-salt). The effect of the metal ion:ligand ratio, presence of salt (Na2SO4), and polymer (polyethylene glycol, PEG-1000) in the Nd(II) determination were analyzed. Once the measurement conditions have been defined, the Nd(III) extraction was assessed in an aqueous two-phase system formed by 20 wt% Na2SO4/H2O and 35 wt% PEG-1000/H2O at different acidity conditions: without acid, 0.1 mol L-1 HCl, and 0.1 mol L-1 H2SO4.
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