Journal
ANALYTICAL CHEMISTRY
Volume 86, Issue 13, Pages 6654-6659Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac501349y
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Funding
- Italian Ministry of Education, University and research (MIUR) through the FIRB project Oxides at the nanoscale: multifunctionality and applications [RBAP115AYN]
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We propose here a novel voltammetric method for the determination of platinum at trace levels. The method is based on the interference that platinum generates on the anodic stripping signal of tin acidic solutions: in appropriate conditions platinum uses the intermediate formation of tin(II) ions, taking place during the tin cathodic reduction, to reduce itself and to form mixed Pt(II) - Sn(II) chloro-complexes. From the analysis of the anodic stripping plots obtained after subsequent additions of tin in a Pt-containing solution, it is possible to quantify accurately and precisely the Pt concentration from 3 ppb to more than 10 ppm. This novel method is validated for the analysis of Pt in heterogeneous catalysts, but in principle could be extended to other matrixes.
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