Determination of Y, Zr and ultra-low Nb concentrations in geological material by multi-ion counting spark-source mass spectrometry (MIC-SSMS) |
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Authors: | J A Pf?nder K P Jochum A Sassen B Stoll P Maissenbacher and M Murmann |
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Institution: | (1) Max-Planck-Institut für Chemie, Postfach 3060, D-55020 Mainz, Germany, DE |
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Abstract: | Precise concentrations of Zr, Y and Nb in the μg/g to ng/g range have been determined in rock samples using multi-ion counting
spark-source mass spectrometry (MIC-SSMS). A high resolution method, combined with interference correction on 91Zr and 93Nb for low concentration samples, was applied. An analytical precision of 2–5% for concentrations down to 0.020 μg/g and 10%
for lower concentrations was attained. The detection limit is below 0.005 μg/g. By measuring international reference materials,
the accuracy of the method was determined to be within about 10% of the recommended values. However, the accuracy of the final
concentration is influenced by interference corrections, but the additional error is below 20%. The interference problem is
most difficult for Al-rich samples (>15% Al2O3), as the interfering molecules are 40Ca27Al12C2
+ and 27Al3
12C+. The accordance between ICP-MS and MIC-SSMS results is worse for low Nb concentrations in the ng/g range. Here, ICP-MS gives
systematically lower values than MIC-SSMS. The reason for this discrepancy is not yet clear, but may be caused by Nb loss
during chemical treatment of the samples prior to ICP-MS measurements.
Received: 29 December 1998 / Revised: 19 April 1999 / Accepted: 21 April 1999 |
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