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Chem. Anal. (Warsaw), 50, 945 (2005)
SHORT COMMUNICATION
The Effect of Hydrofluoric Acid on the Determination of
Platinum and Palladium in Road Dust Applying
Inductively Coupled Plasma Mass Spectrometry
by Barbara A. Leœniewska1*, Beata Godlewska-¯y³kiewicz1
and Adam Hulanicki2
Institute of Chemistry, University of Bia³ystok,
ul. Hurtowa 1, 15-399 Bia³ystok, Poland
2
Department of Chemistry, University of Warsaw,
ul. Pasteura 1, 02-093 Warsaw, Poland
1
Key words:
platinum, palladium, road dust, hydrofluoric acid, digestion, ICP–MS,
spectral interferences, cation-exchange separation
The effect of digestion of road dust in the mixture of aqua regia + HF and of the leaching
of the analytes with aqua regia only on the determination of Pt and Pd applying ICP–MS
technique has been investigated. In order to eliminate spectral interferences in mass spectrometry, mathematical correction was applied, as well as the interferents were separated
from the analytes on a Dowex 50 WX–8 cation-exchange resin. It has been found that after
addition of HF, Hf and Y are transformed into stable fluoride compounds, which are not
retained on the cation-exchanger and cause some interferences in the determination step.
Leaching of the analytes with aqua regia without complete sample dissolution resulted in
the release of Pt and Pd from the road dust. Noteworthy, the analytes were present in the
sample in the form suitable for their separation on cation exchanger. The correctness of the
applied procedure was confirmed via analysis of certified reference material BCR–723.
Zbadano wp³yw sposobu rozk³adu próbek py³u drogowego na oznaczanie Pt i Pd metod¹
spektrometrii mas z jonizacj¹ w plazmie indukcyjnie sprzê¿onej (ICP–MS). W celu wyeliminowania interferencji spektralnych zastosowano metodê korekcji matematycznej w spektrometrii mas oraz oddzielanie analitów od pierwiastków interferuj¹cych (Hf, Y) na kationicie
Dowex 50 WX–8. Stwierdzono, ¿e zastosowanie do mineralizacji HF powoduje tworzenie
siê trwa³ych po³¹czeñ fluorkowych Hf i Y, które nie zatrzymywane na kationicie s¹ przyczyn¹ interferencji w etapie oznaczania. £ugowanie analitów wod¹ królewsk¹ zapewnia
* Corresponding author. E-mail: [email protected]; Fax: +48 85 7470113