Bromine isotope ratio measurements in seawater by multi-collector inductively coupled plasma-mass spectrometry with a conventional sample introduction system

de Gois, J.S.; Vallelonga, P.; Spolaor, A.; Devulder, V.; Borges, D.; Vanhaecke, F.

doi:/10.1007/s00216-015-8820-1

Bromine isotope ratio measurements in seawater by multi-collector inductively coupled plasma-mass spectrometry with a conventional sample introduction system

de Gois, J.S.; Vallelonga, P.; Spolaor, A.; Devulder, V.; Borges, D.; Vanhaecke, F. (2016). Bromine isotope ratio measurements in seawater by multi-collector inductively coupled plasma-mass spectrometry with a conventional sample introduction system. Anal. Bioanal. Chem. 408(2): 409-416. https://dx.doi.org/10.1007/s00216-015-8820-1

In: Analytical and Bioanalytical Chemistry. Springer: Heidelberg. ISSN 1618-2642; e-ISSN 1618-2650, meer

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Trefwoord

Marien/Kust

Author keywords

Bromine; Br isotope ratio; Seawater; MC-ICP-MS; NIST SRM 977; IRMMBCR-403

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de Gois, J.S., meer Vallelonga, P. Spolaor, A.	Devulder, V., meer Borges, D. Vanhaecke, F., meer

Abstract

A simple and accurate methodology for Br isotope ratio measurements in seawater by multi-collector inductively coupled plasma-mass spectrometry (MC-ICP-MS) with pneumatic nebulization for sample introduction was developed. The Br⁺ signals could be measured interference-free at high mass resolution. Memory effects for Br were counteracted using 5 mmol L^-1 of NH₄OH in sample, standard, and wash solutions. The major cation load of seawater was removed via cation exchange chromatography using Dowex 50WX8 resin. Subsequent Br preconcentration was accomplished via evaporation of the sample solution at 90 °C, which did not induce Br losses or isotope fractionation. Mass discrimination was corrected for by external correction using a Cl-matched standard measured in a sample-standard bracketing approach, although Sr, Ge, and Se were also tested as potential internal standards for internal correction for mass discrimination. The d⁸¹Br (versus standard mean ocean bromide (SMOB)) values thus obtained for the NaBr isotopic reference material NIST SRM 977 and for IRMM BCR-403 seawater certified reference material are in agreement with literature values. For NIST SRM 977, the ⁸¹Br/⁷⁹Br ratio (0.97291) was determined with a precision =0.08‰ relative standard deviation (RSD).

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