ASSESSMENT OF A SIMPLE METHOD FOR THE DETERMINATION OF NB AND TA AT THE SUB-μG/G LEVEL IN SILICATE ROCKS BY ICP-MS |
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| Authors: | Franck POITRASSON Christian PIN Philippe TELOUK Jean Louis IMBERT |
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| Institution: | Departement des Sciences de la Terre, UniversitéBlaise Pascal, U.R.A. 10 C.N.R.S., 5 rue Kessler, 63038 Clermont-Ferrand, France;Service Central d'Analyse du C.N.R.S., Echangeur de Solaize, B.P. 22, 69390 Vernaison, France |
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| Abstract: | We report Nb and Ta data for 15 international silicate rock standards, obtained by inductively coupled plasma-mass spectrometry (ICP-MS) measurement following decomposition with HF-HNOs-HCI.95 Moand185Re were used as internal standards, and calibration lines were constructed with artificial solutions. Typical relative standard deviations are better than 10% above 0.2 μg/g, and detection limits for Nb and Ta are 40 and 0.8 ng/g, respectively. The results are generally in good agreement with published data. Moreover, this study points out the Nb-Ta heterogeneity of some standard reference materials on the 100 mg scale. |
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