A new two-stage separation procedure for the IDMS based quantification of low Pd and Pt amounts in automotive exhaust emissions

A two step separation procedure for the quantification of Pd and Pt in automotive exhaust emissions using isotope dilution mass spectrometry was established using a combination of cation and anion exchange chemistry. AG 50 W-X12 was used as cation exchange resin and DGA as weakly basic anion exchange resin. This procedure enabled the effective separation of Pd and Pt from the matrix and from interfering elements. Additionally Pd and Pt were collected in separate chromatographic fractions, which increased the precision of the isotope ratio determination by separate measurement using a single collector sector field ICPMS. The analytical procedure was validated by analysing synthetically prepared samples and the certified reference materials BCR-723 (road dust) and IAEA-450 (algae). For all results, which of course are SI-traceable, complete uncertainty budgets were calculated yielding relative expanded uncertainties (k = 2) of around 1 % for analyte masses in the ng range. Procedure blanks of 55 pg Pd and 3 pg Pt were obtained. Detection limits were calculated as 12 pg for Pd and 7 pg for Pt. Additionally, Pd and Pt blank levels of different filter materials are presented as well as first results for automotive exhaust particles collected on cellulose filters.

VOGL J.;  MEYER Christian;  KOENIG Maren;  BECKER Dorit;  NOORDMANN J.;  RIENITZ O.;  MAMAKOS Athanasios;  RICCOBONO Francesco; 

2015-11-10

ROYAL SOC CHEMISTRY

JRC93443

0267-9477,   

http://pubs.rsc.org/en/Content/ArticleLanding/2015/JA/c4ja00251b#!divAbstract,    https://publications.jrc.ec.europa.eu/repository/handle/JRC93443,   

10.1039/C4JA00251B,