DEVELOPMENT OF HIGH-ACCURACY ICP MASS-SPECTROMETRIC PROCEDURES FOR THE QUANTIFICATION OF PT, PD RH, AND PB IN USED AUTO CATALYSIS

Inductively coupled plasma mass spectrometric procedures have been developed for the high-accuracy determination of three platinum group elements (Pt, Pd,and Rh) and Pb in two used automobile catalysts. Isotope dilution quantification was applied for the certification of Pb, Pt, and Pd. The mononuclidic Rh was quantified using an internal standard after careful assessement of potential systematic errors from incomplete dissolution and instrumental interferences. The Pb concentrations are certified at 6228 +/- 49 mg/kg in SRM 2556 (Used Auto Catalyst-Pellets) and 13931 +/- 97 mg/kg in SRM 2557 (Used Auto Catalyst-Monolith), The certified concentrations for the platinum group elements in SRM 2556 and SRM 2557, respectively, are, for Pt, 697.4 +/- 2.3 and 1131 +/- 11 mg/kg; for Pd, 326.0 +/- 1.6 and 233.2 +/- 1.9 mg/kg; and for Rh, 51.2 +/- 0.5 and 135.1 +/- 1.9 mg/kg.