Solid-phase extractive preconcentration and separation of lanthanum(III) and cerium(III) using a polymer-supported chelating calix [4] arene resin |
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Authors: | V K Jain R A Pandya S G Pillai Y K Agrawal P H Kanaiya |
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Institution: | (1) Chemistry Department, School of Sciences, Gujarat University, Ahmedabad, 380009, India;(2) Institute of Pharmacy and Sciences, Nirma University of Science and Technology, Sarkhej Ghandhi Nagar Highway, Ahmedabad, 382481, India |
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Abstract: | In the present paper, solid-phase extractive preconcentration and separation of lanthanum(III) and cerium(III) using calix4]arene-o-vanillinsemicarbazone
immobilized on a polymeric matrix, a Merrifield peptide resin, is proposed. The diamino derivative of calix4]arene was first
diazotized and coupled with o-vanillinsemicarbazone to obtain a new “upper-rim” functionalized calix4]arene-o-vanillinsemicarbazone.
It was then covalently linked to the Merrifield peptide resin and characterized by FT-IR and elemental analysis. Quantitative
studies were carried out by spectrophotometry and ICP-AES with a relative standard deviation of 1.7%. Various physicochemical
parameters like pH, concentration of eluting agents, flow rate, total sorption capacity, metal-ligand stoichiometry, exchange
kinetics, preconcentration factor, distribution coefficient, breakthrough capacity, resin stability, and effect of electrolytes
and associated metal ions have been studied. The uptake and stripping of these metal ions on the resin was fast, indicating
a better accessibility of La(III) and Ce(III) towards the chelating sites. Detection limits corresponded to three times the
standard deviation of the blank (3σB) and amounted to 3.05 and 6.86 μg/L, along with preconcentration factors of 153 and 133 for La(III) and Ce(III), respectively.
The robustness of the procedure is demonstrated by the recoveries obtained (>97.5%) for La(III) and Ce(III) in the presence
of several cations and anions. The proposed method was satisfactorily applied to the separation of La(III) and Ce(III) from
each other and also from U(VI) and Th(IV) by sequential acidic elution and varying pH. The validity of the method was tested
by analyzing these metal ions in monazite sand and standard geological materials.
The text was submitted by the authors in English. |
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