Simple Selective Spectrophotometric Method for the Determination of Ruthenium in Carbon Supported Pt-Ru-Ge Catalyst
作者:
Maria Balcerzak,
Elżbieta Świecicka,
Dorota Bystrońska,
期刊:
Analytical Letters
(Taylor Available online 1999)
卷期:
Volume 32,
issue 9
页码: 1799-1805
ISSN:0003-2719
年代: 1999
DOI:10.1080/00032719908542934
出版商: Taylor & Francis Group
关键词: Ruthenium determination;platinum metals;determination;catalysts;spectrophotometry;thiourea complexes
数据来源: Taylor
摘要:
A simple spectrophotometric method for the determination of ruthenium in the presence of platinum in Pt-Ru-Ge catalyst applied in fuel cells has been developed. Platinum catalyst (20% Pt) with carbon support containing 0.5% Ru and 5% Ge was digested in the mixture of HCl+HNO3(6+1). Carbon was separated from the examined sample by filtration after dissolution of the metals. Ruthenium was converted into a complex with thiourea (λmax=640 nm, ε = 2.9·1031 mol−1cm−1) in the medium of 5 M in HCl and 1% in thiourea after 15 min heating at 70 °C. Platinum does not interfere with the determination of ruthenium. Germanium is converted into volatile GeCl4and escapes from the examined sample during the digestion step. The content of ruthenium determined in the examined samples of catalyst amounted to 0.49% (RSD = 0.14%).
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