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Determination of Trace Element Mass Fractions in Ultramafic Rocks by HR ‐ ICP ‐ MS : A Combined Approach Using a Direct Digestion/Dilution Method and Preconcentration by Coprecipitation
Author(s) -
Rospabé Mathieu,
Benoit Mathieu,
Candaudap Frédéric
Publication year - 2018
Publication title -
geostandards and geoanalytical research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.037
H-Index - 73
eISSN - 1751-908X
pISSN - 1639-4488
DOI - 10.1111/ggr.12181
Subject(s) - coprecipitation , chemistry , lile , dilution , detection limit , dissolution , matrix (chemical analysis) , chromatography , ultramafic rock , digestion (alchemy) , analytical chemistry (journal) , geology , inorganic chemistry , paleontology , physics , subduction , tectonics , thermodynamics , geochemistry
A procedure is described for the determination of thirty‐seven minor and trace elements ( LILE , REE , HFSE , U, Th, Pb, transition elements and Ga) in ultramafic rocks. After Tm addition and acid sample digestion, compositions were determined both following a direct digestion/dilution method (without element separation) and after a preconcentration procedure using a double coprecipitation process. Four ultramafic reference materials were investigated to test and validate our procedure ( UB ‐N, MGL ‐ GAS [Geo PT 12], JP ‐1 and DTS ‐2B). Results obtained following the preconcentration procedure are in good agreement with previously published work on REE , HFSE , U, Th, Pb and some of the transition elements (Sc, Ti, V). This procedure has two major advantages: (a) it avoids any matrix effect resulting from the high Mg content of peridotite, and (b) it allows the preconcentration of a larger trace element set than with previous methods. Other elements ( LILE , other transition elements Cr, Mn, Co, Ni, Cu, Zn, as well as Ga) were not fully coprecipitated with the preconcentration method and could only be accurately determined through the direct digestion/dilution method.