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%.