Study of sorption of metal ions by Chelex 100 chelating resin.

摘要

Sorption of Pb, Cu, Sn and Sb by Chelex 100 chelating resin was studied using atomic absorption spectroscopy. Distribution coefficients (D) were measured for Pb(II) and Cu(II) between the Chelex 100 resin and aqueous solutions at pH values from 0.5 to 5. Each ion has a maximum in the D value, 4.32E + 04 for Pb(II) and 2.22E + 05 for Cu(II), at pH 5 and when the Chelex 100 is in its ammonium form. Sorptive efficiency decreases with increasing ionic strength of the solution.; Adsorption behaviors for tin(IV) and antimony(V) that form chloro-complexes on Chelex 100 resin in varying hydrochloric acid concentrations were investigated. The maximum D value, 8.96E + 02, for tin(IV) is in 0.5 M hydrochloric acid solution. The adsorption of antimony(V) has a maximum D value of 2.81E + 04 in 6 M hydrochloric acid solution. The trends observed for these two metals are similar; the D values decrease steadily from 0.5 to 2 M HCl, and then increase from 2 to 6 M HCl, slowly for tin(IV), but rapidly for antimony(V).