title: Bromine isotope ratio measurements in seawater by multi-collector inductively coupled plasma-mass spectrometry with a conventional sample introduction system.
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 δ(81)Br (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 (81)Br/(79)Br ratio (0.97291) was determined with a precision ≤0.08‰ relative standard deviation (RSD).
authors.affiliation: Department of Chemistry, Federal University of Santa Catarina, P.O. Box 476, 88040-970, Florianopolis, Santa Catarina, Brazil.|Department of Analytical Chemistry, Ghent University, Krijgslaan 281-S12, 9000, Ghent, Belgium.
authors.forename: Jefferson S
authors.initials: JS
authors.lastname: de Gois
authors.affiliation: Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100, Copenhagen, Denmark.
authors.forename: Paul
authors.initials: P
authors.lastname: Vallelonga
authors.affiliation: Department of Environmental Sciences, Informatics and Statistics (DAIS), Ca' Foscari University of Venice, Dorsoduro 2137, 30123, Venice, Italy.
authors.forename: Andrea
authors.initials: A
authors.lastname: Spolaor
authors.affiliation: Department of Analytical Chemistry, Ghent University, Krijgslaan 281-S12, 9000, Ghent, Belgium.
authors.forename: Veerle
authors.initials: V
authors.lastname: Devulder
authors.affiliation: Department of Chemistry, Federal University of Santa Catarina, P.O. Box 476, 88040-970, Florianopolis, Santa Catarina, Brazil.|INCT de Energia & Ambiente, 88040-900, Florianopolis, Santa Catarina, Brazil.
authors.forename: Daniel L G
authors.initials: DL
authors.lastname: Borges
authors.affiliation: Department of Analytical Chemistry, Ghent University, Krijgslaan 281-S12, 9000, Ghent, Belgium. frank.vanhaecke@UGent.be.
authors.forename: Frank
authors.initials: F
authors.lastname: Vanhaecke
keywords: Br isotope ratio; Bromine; IRMM BCR-403; MC-ICP-MS; NIST SRM 977; Seawater