Equilibrium binding studies of zinc-glycine complexes to ion-exchange resins and clays

Details Equilibrium binding studies of zinc-glycine complexes to ion-exchange resins and clays Equilibrium binding studies of zinc-glycine complexes to ion-exchange resins and clays

Aug 1966

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966gecoa..30..757s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 30, Issue 8, pp.757-768

Computer Science

1

Scientific paper

Uptake studies of trace amounts of zinc on ion-exchange resins and clays were performed at 15°C, pH 8·0, in the presence of 0·7 ionic strength mixed electrolytes and varying concentrations of glycine. The addition of glycine reduced the uptake of zinc on anion exchange resins in a manner predicted by the use of the stability constants of the zinc glycine system, indicating no uptake of the zinc-glycine complexes by these resins. The cationic exchange resin Dowex 50 and a series of clays had higher uptakes of zinc in the presence of glycine than the stability constants predicted. These results were partially explained by the assumption that the complex, zinc-glycine 1 + , is also taken up. Binding parameters for this complex and the clays were calculated. These parameters indicate that, for some clays, the binding of the monovalent zinc glycinate is almost as strong as that of the divalent zinc ion. This is in contrast to the binding of inorganic ions, where divalent ions bind far stronger than do monovalent ones and demonstrates the marked effect of the organic component on the binding of the complex. The stability constants of the zinc-glycine system, determined by a titration method, were log k 1 equals 4·98 and log k s equals 8·98(15°C, 0·7 M NaCl). The pKa of glycine under these conditions was found to be 9·86.

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