ISSN:
1618-2650
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Summary The platinum group metals (PGM) as well as silver, gold and mercury can be preconcentrated and separated from matrix elements by sorption on specific sorbents. After elution with thiourea in dilute hydrochloric acid, the thiourea matrix is destroyed by NaNO2. We found that the Pd-thiourea-complex forms an insoluble compound under specific conditions. Thereby the separation of Pd from all other platinum group metals, except Os which was not measured, and from Ag, Au and Hg can easily be done with thiourea and NaNO2 in a solution buffered with acetate. The metals are finally determined by GFAAS (Perkin Elmer 400, HGA-74). If the concentration of Pd in the buffered solution is not lower than 25 αg/ml, the rate of recovery of Pd is over 90%, except in the presence of Ru. Otherwise the precipitate of the Pd-complex is delayed and not complete. The same effect of retardation occurs if Au is involved. Therefore, high concentrations of Au and Ru in the solution should be absent.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00474251
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