Characterization and evaluation of levextrel extraction chromatographic resins for trace metal separation schemes in automatic water quality control systems.

This paper presents the results of the selective removal of Zn(II) from Cu( II), Cd(II), Ni(II) and Pb(II) using "Extraction Chromatographic Resins" Le watit TP807'84, which contains di(2,4,4-trimethylpentyl)phosphinic acid as active component. The extraction and selectivity patterns of the resin were obtained from the metal distribution coefficients as a function of pH. Exp erimental data of Pb(II), Ni(II) and other natural water occurring metal io ns, such as Ca(II), were analyzed graphically and numerically in order to d escribe the metal extraction reactions. Analysis of the results showed that the extraction of these metal ions can be explained assuming the formation of metal complexes in the resin phase with a general composition ML2(HL)(q ), where q takes different values depending on the metal studied. Finally t he efficiency of the resin in the selective removal of Zn(II) from the toxi c heavy metal group Cu(II), Cd(II), Ni(TI) and Pb(Il) were evaluated.