Accurate Measurement of Rare Earth Elements by ICP-MS after Ion-Exchange Separation: Application to Ultra-Depleted SamplesReport as inadecuate




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1 ISTerre - Institut des Sciences de la Terre 2 LCE - Laboratoire Chrono-environnement

Abstract : This study reports precise and accurate data for rare earth elements REE measured on eight geological reference materials, five enriched in REE BE-N, BHVO-2, BR, BR-24 and RGM-1 and three very depleted in REE BIR-1, UB-N and DTS-2. Data were acquired by quadrupole ICP-MS after isolation of the REE using an ion-exchange chromatography procedure. All the measured REE abundances were similar within 5% 10% for the most REE-depleted sample DTS-2 to the high-quality measurements previously published in the literature. We also show that by using an internal Tm spike, the reproducibility of the data was improved to 1%. Applying this technique to the analysis of ultra-depleted rock samples sub ng g-1, we show that significant improvements were obtained relative to the routine trace element measurement method. The chondrite-normalised patterns were smooth instead of displaying irregularities. Although the classical method gives excellent results on REE-rich samples, we believe that our technique improves the precision and accuracy of measurements for highly REE-depleted rocks.





Author: Marc Ulrich - Sarah Bureau - Catherine Chauvel - Christian Picard -

Source: https://hal.archives-ouvertes.fr/



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