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- W2087889568 abstract "We present a new method that determines precisely and accurately rare earth elements (REE) at the sub-ng g-1 level in ultramafic rocks based on acid dissolution and quadrupole ICP-MS with systematic interference corrections on each sample. The method is demonstrated by analyses of the international geochemical reference materials, PCC-1 (peridotite), DTS-1 (dunite) and DTS-2 (dunite) provided by the United States Geological Survey (USGS), and JP-1 (peridotite) issued by the Geological Survey of Japan (GSJ). Detection limits, as rock equivalent, were calculated to be 0.01-0.08 ng g-1 for our instrument, which is sufficiently low compared to the REE concentrations of ultramafic rocks. In addition, procedural blanks of the proposed method were 0.2-5 pg, which is negligible even for the ultra-low level REE determinations. Reproducibility obtained from separate dissolutions and measurements of USGS DTS-2 and GSJ JP-1 was 3-6%, which corresponds to the high-precision data obtained by ID-TIMS or magnetic sector field ICP-MS with a desolvating nebuliser. The REE data determined exhibit smooth chondrite-normalised REE patterns for all of the tested geochemical reference materials, and the abundances are in good agreement with recently published data. Nous présentons une nouvelle méthode pour la détermination précise et juste de concentrations en Terres Rares de l'ordre du ng g-1 dans des roches ultrabasiques. Elle regroupe une dissolution acide et une analyse par ICP-MS à quadripôle associée à une correction systématique des interférences sur chaque échantillon. La validité de la méthode est démontrée par l'analyse de matériaux certifiés de référence, tels que PCC-1 (péridotite), DTS-1 et DTS-2: dunites fournies par le Service Géologique des USA (USGS), et JP-1(péridotite) distribué par le Service Géologique du Japon (GSJ). Les limites de détection exprimées en roche-équivalent, ont été estimées entre 0.01 et 0.08 ng g-1 pour notre instrument, ce qui est raisonnablement bas par rapport aux concentrations de Terres Rares dans des roches ultrabasiques. De plus, les blancs d'analyse liés à la méthode proposée étaient de 0.2 à 5 pg, ce qui est négligeable même dans le cas de très basses concentrations en Terres Rares. La reproductibilité obtenue sur des mises en solutions et mesures indépendantes de USGS DTS-2 et GSJ JP-1 était de 3 à 6%, c'est à dire du même ordre de grandeur que les résultats fournis par ID-TIMS ou par ICP-MS à secteur magnétique coupléà un nébuliseur avec désolvatation. Les données de Terres Rares normalisées aux chondrites montrent des spectres très réguliers pour tous les matériaux certifiés de référence qui ont été testés et les abondances sont en bon accord avec les données récemment publiées." @default.
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- W2087889568 date "2007-09-01" @default.
- W2087889568 modified "2023-10-03" @default.
- W2087889568 title "Precise Determination of Ultra-Low (sub-ng g<sup>-1</sup>) Level Rare Earth Elements in Ultramafic Rocks by Quadrupole ICP-MS" @default.
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- W2087889568 doi "https://doi.org/10.1111/j.1751-908x.2007.00859.x" @default.
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