Levextrel solvent impregnated

Sorbents containing immobilized extractants can be classified into two basic types (1) solvent-impregnated resins prepared by adsorption of an liquid extractant on polymer supports and (2) resins with liquid extractant encarcerated within polymer matrix during polymerization (TVEX and Levextrel resins) [6,7]. 

Cortina et al. [6,18,32] studied the efficiency of impregnated resins containing the active component of Cyanex 272 adsorbed onto Amberlite XAD2 for the extraction of Zn(II), Cu(II), and Cd(II) from dilute solutions in nitrate and chloride media. The metal distribution studies show, as described in Sect. III.B, that the extraction of these metal ions involves reactions similar to those in solvent extraction systems. The extraction results indicate that Zn(Il) is adsorbed more selectively than Cu(II) and Cd(II), making possible the quantitative separation of Zn(II) from the other two [6], No significant differences were found on comparison of the extraction efficiency of these resins with Levextrel 807 84 resins [35]. 

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