Plasma platinum group metals

Solid metal electrodes are usually polished mechanically and are sometimes etched with nitric acid or aqua regia. Purification of platinum group metal electrodes is effectively achieved also by means of high-frequency plasma treatment. However, electrochemical preparation of the electrode immediately prior to the measurement is generally most effective. The simplest procedure is to polarize the electrode with a series of cyclic voltammetric pulses in the potential range from the formation of the oxide layer (or from the evolution of molecular oxygen) to the potential of hydrogen evolution (Fig. 5.18F). 

M. Krachler, A. Alimonti, F. Petrucci, K. J. Irgoli , F. Forestiere, S. Caroli, Analytical problems in the determination of platinum-group metals in urine by quadrupole and magnetic sector E>eld inductively coupled plasma mass spectrometry, Anal. Chim. Acta, 363 (1998), ID 10. 

Vlaankova, R. Otruba, V. Bendl, J. Fiera, M. Kanicky, V. Preconcentration of platinum group metals on modified silicagel and their determination by inductively coupled plasma atomic emission spectrometry and inductively coupled plasma mass spectrometry in airborne particulates. 1999, 48 (4), 839. 

Shazali 1, Van t Dack L, Gijbels R (1987) Determination of precious metals in ores and rocks by thermal neutron activation/y-spectrometry after preconcentration by nickel sulfide fire assay and coprecipitation with tellurium. Anal Chim Acta 196 49-58 Stembeck J, Sjodin A, Andreasson K (2002) Metal emissions from road traffic and the influence of resuspension—results from two tunnel studies. Atmos Env 36 4735-4744 Sun Y, Guan X, Du A (1998) Determination of platinum group elements by inductively coupled plasma-mass spectrometry combined with nickel sulfide fire assay and tellurium coprecipitation. Spectrochim Acta B 53 1463-1467... 

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