Study on Solid-Phase Extraction and Graphite Furnace Atomic Absorption Spectrometer (GF-AAS) for the Determination of Platinum, Palladium and Gold

Abstract

In this work, a new sorbent was prepared by immobilization of 3-methyl-2,6-diaminopyridine (MDMP) on MCI-GEL resin and then used as a solid phase extraction sorbent for trace platinum, palladium and gold ions. The parameter for solid phase extraction (effects of pH, the sample flow rate and volume, the elution condition and the potentially interfering ions) were carefully investigated. In the desorpted medium, the platinum, palladium and gold were determination by graphite furnace atomic absorption spectrometer (GFAAS). The effect on the atomic signal was eliminated by selecting proper pyrolysis and atomization temperatures for all analysts. This method was applied to the determination of trace platinum, palladium and gold in the geological samples. The relative standard derivation were 3.6-4.8 %. The standard recoveries (three different concentrations of markers: 0.02, 0.04 and 0.08 μg) were ranged from 92-107 %. The results are satisfactory.