ORGANIC PRECIPITATE FLOTATION OF TRACE METALLIC ELEMENTS WITH AMMONIUM PYRROLIDINE DITHIOCARBAMATE (II) - APPLICATION OF SOLVENT SUBLATION FOR DETERMINATION OF TRACE CD, CO, CU AND NI IN WATER SAMPLES

A solvent sublation was studied for the determination of trace Cd, Co, Cu and Ni in water samples. Ammonium pyrrolidine dithiocarbamate (APD C) was used as a complexing agent. Experimental conditions such as pH of solution, amounts of APDC, the type and amount of surfactant, the t ype of solvent, etc. were optimized for the effective sublation of ana lytes. After metal-PDC complexes were formed in sample solutions of pH 2.5, the precipitate-type complexes were floated in a notation cell w ith an aid of sodium lauryl sulfate as a surfactant and by bubbling wi th nitrogen gas. The precipitates were dissolved and separated into th e surface layer of methyl iso-butyl ketone (MIBK). The analytes precon centrated were determined by a graphite furnace atomic absorption spec trophotometry (GF-BAS). Extractability of each element was 88% for Cd( II), 86% for Co(II), 95% for Cu(II) and 76% for Ni(II), respectively. And this procedure was applied to the analysis of real samples. From t he recoveries of more than 92%, it was concluded that this method coul d be simple and applicable for the determination of trace elements in various water samples of a large volume.