The Effect of Hydrofluoric Acid on the Determination of Platinum and Palladium in Road Dust Applying Inductively Coupled Plasma Mass Spectrometry

摘要

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 spec-trometry,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.