SCHEDULED MAINTENANCE
Determination of Platinum, Palladium, Rhodium and Titanium in Automotive Catalytic Converters Using Inductively Coupled Plasma Mass Spectrometry With Liquid Nebulization
Abstract
ICP-MS was used for the determination of Pt, Pd, Rh and Ti in
automotive catalytic converters. A microwave digestion procedure employing
a mixture of H
2
O, HF, HCl and HNO
3
was studied and
compared with a procedure using a mixture of H
2
SO
4
,
H
3
PO
4
and
aqua regia
. The use of the latter
results in significant losses of Pt and Ti. The influence of sample size
on the recoveries of Pt, Rh, Ti and some REEs is discussed. It is shown
that a sample amount larger than 0.12 g results in incomplete recoveries
of REEs with no significant loss of the other elements. Instrument
calibration using the standard addition method and matrix matching are
discussed. It is shown that close matrix matching using cordierite, the
substrate, with a washcoat, the catalyst support, provides spectral
interference correction for polyatomic oxide species. The results obtained
are in good agreement with those obtained by wavelength-dispersive X-ray
fluorescence analysis.
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