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The Pt content in car catalyst is of great economic interest and accurate determination of Pt in this material is important. A method has been developed to provide traceable reference values. Traceability to the System International (SI) system can be realized by applying isotope dilution, a method that can be completely described and for which a detailed and simple uncertainty budget can be given.
Car catalysts consist of a ceramic support coated with different wash-coats and finally metallic mixtures depending on the type of catalyst. Total digestion of the matrix was achieved using a multiple step microwave digestion with different acid mixtures. The enriched Pt used as a spike was added as a solution before the digestion. A separation procedure for Pt was developed. The matrix elements were retained on a cation exchange resin while the Pt passes as an anionic complex. The Pt content is then determined by measuring the isotope ratio in the sample/spike mixture.

Additional information

Authors: HELD A, JRC Geel (BE);BRICHE C, JRC Geel (BE);TAYLOR P, JRC Geel (BE)
Bibliographic Reference: Paper presented: 3 Symposium Massenspektrometrische Verfahren der Elementspurenanalyse, Jülich (DE), September 24-26, 1996
Availability: Available from (1) as Paper EN 39814 ORA
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