Determination of rhodium and platinum by electrothermal atomic absorption spectrometry after preconcentration with a chelating resin

Abstract

The present publication describes a separation/preconcentration procedure for the subsequent trace analysis of rhodium and platinum in environmental samples. A chelating ion-exchange resin was employed for this purpose and an automatic on-line flow injection electrothermal atomic absorption spectrometry (FI-ET-AAS) method was used for the determination of trace amounts of Rh and Pt in different materials. The solutions are simultaneously treated and the ions determined sequentially. Detection limits of rhodium and platinum are 0.8 and 1.0 ng mL-1, respectively. Linearity was obtained in the range 0-50 ng mL-1 for rhodium and 0-100 ng mL-1 for platinum. The relative standard deviations were 1.8% for 10 ng mL-1 of Rh and 1.6% for 10 ng mL-1 of Pt. Enrichment factors were 20 for Rh and 14 for Pt. ©2007 Sociedade Brasileira de Química.