Sorption of dicyanoaurate anions by novel resins containing N,N '-substituted diamides of malonic acid

Two novel ion-exchange/coordinating resins have been synthesized and used i n the sorption of dicyanoaurate anions, Au(CN)(2)(-), from aqueous solution from their mixtures with Fe(III) cyano complexes, Ag(I) cyano complexes, Z n(II) cyano complexes, Fe(II) cyano complexes, Cu(II) cyano complexes, and from solutions containing all of the above species. It has been found that Resin 1 containing the N,N'-substituted amide of malonic acid with terminal guanidyl groups is able to remove ca. 10 mg Au/g, and Resin 2 containing t he N,N'-substituted amide of malonic acid with terminal imidazole groups re moves ca. 13 mg Au/g from the above solutions when there is an initial conc entration of 5.08 mg Au/dm(3). Resin 1 is selective toward gold over all me tals but Fe(II). Resin 2 is more selective, and when sorption is carried ou t from the solution formulated with all the metals displays the following s electivity coefficients: of gold over Fe(II) + Fe(II), + infinity; of gold over Ag(I), + infinity; of gold over Zn(II), 3.79; and of gold over Cu(II), 2.81.