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Title: Extraction study of microgram amounts of lanthanum (III) ions from salicylate medium using high molecular weight amine
Authors: Mandhare, A M
Anuse, M A
Kolekar, S S
Keywords: 2-octylaminopyridine;Extraction behaviour;Lanthanum (III) ion;Xylene solution
Issue Date: Nov-2011
Publisher: NISCAIR-CSIR, India
Abstract: This paper reports solvent extraction behaviour of lanthanum (III) from salicylate medium (0.0065–0.0085 M) in a xylene solution of 2-octylaminopyridine (2-OAP). The effect of important variables like equilibrium time, nature of diluents, concentration of salicylic acid, extractant and metal ion on the extraction is investigated. Based on partition data the stoichiometry of the extracting species is formulated as [2-OAPH+. La(sal)2 -]. The reagents like sulphuric acid (0.5-0.6 N), acetic acid (0.8-1.0 M) and hydrochloric acid (0.1 M) have been found effective for the stripping of the metal ions. 2-OAP is stable even after prolonged acid contact, no emulsion formation takes place and the extraction efficiency remains unaffected even after 10 recycling steps. The procedure is robust as demonstrated by the high recovery (99.5%) of lanthanum (III) in the presence of several cations and anions which are commonly associated with it. The proposed method is satisfactorily applied to the separation of lanthanum (III) from binary, ternary mixtures and also from real samples. The selectivity of the extraction is enhanced by using suitable sequestering reagents.
Page(s): 475-482
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.18(6) [November 2011]

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