Oxidation product of ammonium pyrrolidin-1-yldithioformate as a coprecipitator for the preconcentration of vanadium, cobalt, zinc, arsenic, iron, cadmium, selenium and mercury from aqueous solution

Abstract

The use of ammonium pyrrolidin-1-yldithioformate [ammonium pyrrolidinedithiocarbamate (APDC)] as a complexing agent for V, Co, Fe, Cu, Zn, As, Cd, Se and Hg, and its oxidation product as a collector, for the preconcentration of these elements from aqueous solutions, has been studied. All these elements are simultaneously concentrated 1600-fold in a single precipitate of the collector. The coprecipitation depends on the concentration of APDC in aqueous solution and the pH. The recoveries are generally greater than 93% although some exceptions are noted. The method can be recommended for the preconcentration of the elements in the analysis of natural waters and for the purification of MnCl₂ solution in the presence of Co, Fe, Cu, Cd, Hg and other transition elements. In this instance, the recovery yields are greater than 92%.