Polynomial mass bias functions for the internal standardization of isotope ratio measurements by multi-collector inductively coupled plasma mass spectrometry

The calibration strategy was applied to the measurement of Pb, Sm and Ni isotope ratios in clean solutions using Tl, Eu and Cu as internal standards, respectively. Results of the analysis of the standard reference material NBS 982 for 208Pb/206Pb, 207Pb/206Pb and 204Pb/206Pb isotope ratios were 1.000290 ± 0.000025, 0.466994 ± 0.000008 and 0.027218 ± 0.000003 (± 1 standard deviation, n = 48) with errors of (+ 0.0130 ± 0.0025)%, (− 0.0271 ± 0.0017)% and (− 0.005 ± 0.009)%, respectively.