Cloud point extraction and Flame Atomic Absorption Spectrometry in the determination of Cu (II), Cr (III), Cd(II), Fe(III) and Mn(II) using Glycerin and PO/EO-block polymer as a surfactant

Abstract

A simple cloud point extraction (CPE) method has been proposed for the separation & preconcentration for determination of Cr3+, Cu2+, Cd2+, Fe3+ and Mn2+ ions by complexation with ammonium pyrrollidine dithiocarbamate (APDC) in the presence of Glycerin and PO/EO-block polymer. The phase separation occurred when micellar solution was heated at 60◦C. A complete separation of the metal ions with and without addition of chelating agent could be achieved at PH= 3-10 the efficiency of separation is 85-100%. Glycerin showed 75- 100% separation for Cr3+, Cu2 and Mn2+ while PO/EO-block polymer showed 60-99% for Cd2+and Fe3+. Other factors also tested include surfactant and metal ions concentration, temperature, time and foreign ions. One gram of surfactant is an enough amount for separation of 20 ppm of each metal ion solution. The analysis of metal ions were carried out using flame atomic absorption spectrometer with deuterium lamp background correction and calibration curve method.