MC‐ICP‐MS Isotope Measurements with Direct Injection Nebulisation (d‐DIHEN): Optimisation and Application to Boron in Seawater and Carbonate Samples

Geostandards and Geoanalytical Research - Tập 35 Số 1 - Trang 75-88 - 2011
P. Bonville1, Julien Bouchez1, Guillaume Paris2,3
1Équipe de Géochimie et Cosmochimie, Institut de Physique du Globe de Paris, Université Paris-Diderot, Sorbonne Paris Cité UMR CNRS 7154, 1 Rue Jussieu, 75238 Paris Cedex 05, France
2Institut Francais du Petrole, Département Géochimie, 1 et 4, Avenue de Bois‐Préau, 92852 Rueil‐Malmaison Cedex, France
3Équipe de Géochimie et Cosmochimie, Institut de Physique du Globe de Paris, Université Paris‐Diderot, Sorbonne Paris Cité UMR CNRS 7154, 1 Rue Jussieu, 75238 Paris Cedex 05, France

Tóm tắt

We report here an optimisation of the demountable direct injection high efficiency nebuliser (d‐DIHEN) for isotopic measurements with a Neptune (ThermoFisher Scientific, Bremen, Germany) multi‐collector inductively coupled plasma‐mass spectrometer (MC‐ICP‐MS) and describe a method for boron isotopic ratio determination. With direct injection nebulisation 100% of the analyte was introduced into the ICP‐MS plasma and wash times were drastically reduced for elements such as boron and thorium. Compared to the classical stable introduction system (SIS: double Scott/cyclonic spray chamber), sensitivity for boron was 2–5 times higher with d‐DIHEN and wash times up to ten times shorter. Repeatability of 11B/10B sample‐calibrator bracketing measurements reached 0.25‰ (2s) for seawater and coral samples. Method accuracy and reproducibility were tested on mixed reference solutions having δ11B values in the ranges −90 to +40‰ and −2 to +2.5‰, demonstrating our ability to distinguish δ11B values with differences of only 0.25‰. The international seawater reference material NRCC NASS‐5 (National Research Council, Ottawa, Canada), analysed in different sessions over a 10‐month period, yielded an average δ11B value of +39.89 ± 0.25‰, in the upper range of previously published seawater values. A comparison between δ11B determined by d‐DIHEN MC‐ICP‐MS and positive‐TIMS (P‐TIMS) for four modern corals showed an excellent agreement (with bias of less than 0.4‰).

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Geostandards and Geoanalytical Research

Tập 35 Số 1

75-88

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