1969 Volume 42 Issue 12 Pages 3454-3458
The adsorption of HEDTA (H3Ch) on the hydrogen form of Dowex 50W, X-8, 100–200 mesh, has been studied as a function of the concentration of H3Ch in the aqueous phase. The experiments were performed by means of either the column or a combination of the column and batch methods, with the latter being employed for the adsorption of HEDTA on the resin in equilibrium with dilute solutions. In solutions up to approximately 0.07 mol/l, such as H3Ch, the experimental data are consistent with the Langmuir equation expressed by: [H3Ch]/(‾ChT⁄E)=1⁄Bk+[H3Ch]⁄B. The adsorbed amount is represented in the term ‾ChT⁄E, where ‾ChT is the total amount of cationic species of HEDTA on the resin, and E, the exchange capacity of resin. A good straight line is obtained with B=0.571 and K=0.420. The results show that, because of a high concentration of hydrogen ion inside the resin, the adsorbed HEDTA is present mainly in the H5Ch2+ species and partly in the H4Ch+ species.
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