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Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.18 [2011] >
IJCT Vol.18(6) [November 2011] >
| 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.
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| Page(s): | 475-482 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.18(6) [November 2011]
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