Article ID Journal Published Year Pages File Type
1241889 Talanta 2015 5 Pages PDF
Abstract

•The isobaric interferences in bromine isotope measurements were effectively solved.•An overall external reproducibility of ±0.1‰ for δ81Br has been achieved.•Counter cations effect was due to bromine loss and diffusive isotope fractionation.

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 (40Ar38ArH+ and 40Ar40ArH+) in the measurement of bromine isotopes (79Br+, 81Br+) has been effectively solved. The external reproducibility of the measured 81Br/79Br ratios in the selected standard reference materials ranged from ±0.03‰ to ±0.14‰, 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.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide

Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
Authors
, , , , , , , ,