Separation of Platinum from Palladium and Iridium in Iron Meteorites and Accurate High-Precision Determination of Platinum Isotopes by Multi-Collector ICP-MS
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Date
2017-12
Publication Type
Journal Article
ETH Bibliography
yes
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Abstract
This study presents a new measurement procedure for the isolation of Pt from iron meteorite samples. The method also allows for the separation of Pd from the same sample aliquot. The separation entails a two-stage anion-exchange procedure. In the first stage, Pt and Pd are separated from each other and from major matrix constituents including Fe and Ni. In the second stage, Ir is reduced with ascorbic acid and eluted from the column before Pt collection. Platinum yields for the total procedure were typically 50–70%. After purification, high-precision Pt isotope determinations were performed by multi-collector ICP-MS. The precision of the new method was assessed using the IIAB iron meteorite North Chile. Replicate analyses of multiple digestions of this material yielded an intermediate precision for the measurement results of 0.73 for ε192Pt, 0.15 for ε194Pt and 0.09 for ε196Pt (2 standard deviations). The NIST SRM 3140 Pt solution reference material was passed through the measurement procedure and yielded an isotopic composition that is identical to the unprocessed Pt reference material. This indicates that the new technique is unbiased within the limit of the estimated uncertainties. Data for three iron meteorites support that Pt isotope variations in these samples are due to exposure to galactic cosmic rays in space.
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Publication status
published
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Book title
Journal / series
Volume
41 (4)
Pages / Article No.
633 - 647
Publisher
Wiley-Blackwell
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Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Pt isotopes; Pd isotopes; multi-collector ICP-MS; ion-exchange chemistry; iron meteorites
Organisational unit
03946 - Schönbächler, Maria / Schönbächler, Maria
Notes
Funding
279779 - Accretion and Differentiation of Terrestrial Planets (EC)