title: Comparison of digestion methods for the determination of ruthenium in catalyst materials.
abstract: A fusion method, an acid digestion method with a high pressure asher (HPA) and two microwave (MW)-assisted acid digestion methods were compared to investigate their suitability for the determination of Ru in catalyst materials. Ru contents in the digested samples were determined with inductively coupled plasma optical emission spectrometry (ICP-OES). Ru powder and three Ru compounds (RuO2 · xH2O, anhydrous RuO2 and RuCl3), possibly present in Ru catalysts, were digested and analyzed to compare the digestion efficiencies of the methods. Significant differences among the digestion efficiencies of the methods were observed; the fusion method having the best digestion efficiency for the compounds studied. The methods were applied for the determination of Ru in alumina- and carbon-supported catalysts. No differences among the methods were observed for these samples.
authors.affiliation: Department of Chemistry, University of Oulu, P.O. Box 3000, FI-90014, Finland.
authors.forename: Terhi
authors.initials: T
authors.lastname: Suoranta
authors.affiliation: Department of Chemistry, University of Oulu, P.O. Box 3000, FI-90014, Finland.
authors.forename: Matti
authors.initials: M
authors.lastname: Niemelä
authors.affiliation: Department of Chemistry, University of Oulu, P.O. Box 3000, FI-90014, Finland. Electronic address: paavo.peramaki@oulu.fi.
authors.forename: Paavo
authors.initials: P
authors.lastname: Perämäki
keywords: Catalyst material; Fusion; High pressure asher; ICP-OES; Microwave-assisted digestion; Ruthenium