Solid-phase extractions with freshly precipitated metal-diethyldithiocarbamates and atomic absorption spectrophotometric determination of copper

Abstract

Using the freshly precipitated metal diethyl dithiocarbamates Mn(DDTC)(2), Zn(DDTC)(2), Cd(DDTC)(2), Fe(DDTC)(3), Co(DDTC)(2), Cu(DDTC)(2), Ni(DDTC)(2), Pb(DDTC)(2) and Hg(DDTC)(2) as reagents, a new solid phase extraction method (SPE) has been described for the selective extraction of Mn(II), Zn(II), Cd(II), Fe(III) Co(II), Cu(II), Ni(II), Pb(II), and Hg(II) ions in aqueous system. These reagents show excellent selectivity for the extraction of metal ions with higher conditional stability constants (or extraction constants). As an example the application of these reagents has been carried out, where freshly precipitated Ni(DDTC)(2) was used for the preconcentration of copper in aqueous system prior to its determination by FAAS.