Issue 3, 2024

Inductively coupled plasma time-of-flight mass spectrometry (ICP-TOFMS) with desolvating sample introduction and He collision gas for high-accuracy determination of Rh, Pd and Pt in automobile catalytic converters

Abstract

A novel and selective method has been developed for high-accuracy determination of Pd, Pt and Rh in complex autocatalyst matrices using isotope dilution (ID) analysis (for Pt and Pd) and internal standard (IS) matching (for Rh) with ICP-time-of-flight mass spectrometry (ICP-TOFMS). By using a desolvating inlet interface and He collision gas, spectral interferences on selected isotopes (e.g., 105Pd, 195Pt, 196Pt) were successfully removed. Calibration is performed by exact-matching ID analysis for Pd (104Pd/105Pd) and Pt (196Pt/195Pt) and IS matching with 101Ru for monoisotopic 103Rh. Due to the quasi-simultaneous determination of all the isotopes of interest by ICP-TOFMS, isotope ratio precision was improved in comparison with that of sequential instrumentation, thus leading to reduced measurement uncertainties of <1% (k = 2), as required by autocatalyst manufacturers. This represents an approximately 2–3-fold improvement for Rh and Pd and 6-fold improvement for Pt in comparison to the uncertainties achieved using the same measurement strategy for sequential ICP-MS instrumentation. The method has been applied to the characterisation of a candidate CRM LGC3101 (unused automobile catalyst) containing high levels of Zr and Hf and validated by the analysis of similar matrix CRMs and by participation in an interlaboratory exercise.

Graphical abstract: Inductively coupled plasma time-of-flight mass spectrometry (ICP-TOFMS) with desolvating sample introduction and He collision gas for high-accuracy determination of Rh, Pd and Pt in automobile catalytic converters

Article information

Article type
Paper
Submitted
24 ⵏⵓⵡ 2023
Accepted
16 ⵉⵏⵏ 2024
First published
18 ⵉⵏⵏ 2024

J. Anal. At. Spectrom., 2024,39, 868-878

Inductively coupled plasma time-of-flight mass spectrometry (ICP-TOFMS) with desolvating sample introduction and He collision gas for high-accuracy determination of Rh, Pd and Pt in automobile catalytic converters

S. Strekopytov, J. Entwisle, S. Hill and H. Goenaga-Infante, J. Anal. At. Spectrom., 2024, 39, 868 DOI: 10.1039/D3JA00416C

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