摘要 : A new, feasible procedure for high-precision bromine isotope analysis using multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS) is described. With a combination of HR mass resolution mode and accurate optimizat... 展开 A new, feasible procedure for high-precision bromine isotope analysis using multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS) is described. With a combination of HR mass resolution mode and accurate optimization of the Zoom Optics parameters (Focus Quad: -1.30; Zoom Quad: 0.00), the challenging problem of the isobaric interferences ((ArArH+)-Ar-40-Ar-38 and (ArArH+)-Ar-40-Ar-40) in the measurement of bromine isotopes (Br-78(+), Br-81(+)) has been effectively solved. The external reproducibility of the measured Br-81/Br-78 ratios in the selected standard reference materials ranged from +/- 0.03 parts per thousand to +/- 0.14 parts per thousand, which is superior to or equivalent to the best results from previous contributions. The effect of counter cations on the Br+ signal intensity and the instrumental-induced mass bias was evaluated as the loss of HBr aerosol in nebulizer and potential diffusive isotope fractionations. (C) 2015 Elsevier B.V. All rights reserved. 收起