Agrawal, A and Sahu, K K (2005) Influence of temperature on the exchange of alkaline earth and transition metals on iminodiacetate resin. Solvent Extraction and Ion Exchange, 23 (2). pp. 265-287.
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Ion exchange equilibrium studies were carried out for Mg2+, Ba2+, Ca2+, Sr2+, Cu2+, Pb2+, Hg2+, Ag+, Mn2+, Ni2+, Fe3+ ions using Amberlite IRC 718, a weakly acidic ion exchanger containing the iminodiacetate group as a chelating functionality. Influence of temperature on the exchange equilibrium of these metal ions was studied in the temperature range 282-323 K. Exchange isotherms were plotted for these ions; which indicated a differential selectivity. Plots of the logarithm of selectivity coefficient and equivalent fraction of the metal ions in the exchanger phase gave the value of equilibrium constant (K-a). Based on the values of selectivity coefficient (K-c) values, selectivity of the resin for alkaline earth metal ions was in the order Sr2+ > Ba2+ > Ca2+ > Mg2+ and for transistion metals studied the selectivity was in the order Ni2+ > Cu2+ > Pb2+ > Mn2+ > Hg2+ > Fe3+ > Ag+. Various thermodynamic parameters were calculated and the results indicate the preferential uptake of divalent cations over Na+ ions.
|Official URL/DOI:||DOI: 10.1081/SEI-200044396|
|Uncontrolled Keywords:||chelating resin; Amberlite IRC 718; thermodynamics; alkaline earth metals|
|Divisions:||Metal Extraction and Forming|
|Deposited By:||Sahu A K|
|Deposited On:||14 Jul 2011 17:27|
|Last Modified:||13 Dec 2011 15:07|
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