Boron isotope ratio determination in carbonates via LA-MC-ICP-MS using soda-lime glass standards as reference material

Fietzke, Jan; Heinemann, Agnes; Taubner, Isabelle; Böhm, Florian; Erez, Jonathan; Eisenhauer, Anton

doi:10.1039/c0ja00036a

Cited by 63 publications

(74 citation statements)

References 33 publications

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“…However, if materials with very high thermal conductivity are ablated, even fsLA might be affected by thermal ablation effects. This hypothesis is supported by the observation that accurate isotope data was obtained when samples and reference materials for calibration had similar thermal conductivity (e.g., when samples and calibrators are both dielectrics, such as silicates), despite differences in chemical composition (e.g., [12,76,80]). On the other hand, when thermal conductivity between sample and calibrator was very distinct, e.g., Cu metal (≈ 400 W/m/K, [84]) vs. sulphides (< 40 W/m/K, [84]) or Fe metal (≈ 80 W/m/K, [84]) vs. silicates (< 7 W/m/K, [84]), a bias in the measured -values was observed for fsLA [12] and nsLA [73], respectively.…”

Section: Discussionsupporting

confidence: 58%

Testing the limits of micro-scale analyses of Si stable isotopes by femtosecond laser ablation multicollector inductively coupled plasma mass spectrometry with application to rock weathering

Schuessler

Blanckenburg

2014

Spectrochimica Acta Part B: Atomic Spectroscopy

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Abstract. An analytical protocol for accurate in-situ Si stable isotope analysis has been established on a new second-generation custom-built femtosecond laser ablation system. The laser was coupled to a multicollector inductively coupled plasma mass spectrometer (fsLA-MC-ICP-MS). We investigated the influence of laser parameters such as spot size, laser focussing, energy density and repetition rate, and ICP-MS operating conditions such as ICP mass load, spectral and nonspectral matrix effects, signal intensities, and data processing on precision and accuracy of Si isotope ratios. We found that stable and reproducible ICP conditions were obtained by using He as aerosol carrier gas mixed with Ar/H2O before entering the plasma. Precise  29 Si and  30 Si values (better than ±0.23‰, 2SD) can be obtained if the area ablated is at least 50 x 50 µm; or, alternatively, for the analysis of geometric features down to the width of the laser spot (about 20 µm) if an equivalent area is covered. Larger areas can be analysed by rastering the laser beam, whereas small single spot analyses reduce the attainable precision of  30 Si to ca. ±0.6 ‰, 2SD, for <30 µm diameter spots. It was found that focussing the laser beam beneath the sample surface with energy densities between 1 and 3.8 J/cm² yields optimal analytical conditions for all materials investigated here. Using pure quartz (NIST 8546 aka. NBS-28) as measurement standard for calibration (standard-sample-bracketing) did result in accurate and precise data of international reference materials and samples covering a wide range in chemical compositions (Si single crystal IRMM-017, basaltic glasses KL2-G, BHVO-2G and BHVO-2, andesitic glass ML3B-G, rhyolitic glass ATHO-G, diopside glass JER, soda-lime glasses NIST SRM 612 and 610, San Carlos olivine). No composition-dependent matrix effect was discernible within uncertainties of the method. The method was applied to investigate the Si isotope signature of rock weathering at the micro-scale in a corestone sampled from a highly weathered roadcut profile in the tropical Highlands of Sri Lanka. The results show that secondary weathering products accumulated in cracks and grain boundaries are isotopically lighter than their unweathered plagioclase host, consistent with isotopically heavy dissolved Si found in rivers.

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Section: Discussionsupporting

confidence: 58%

Testing the limits of micro-scale analyses of Si stable isotopes by femtosecond laser ablation multicollector inductively coupled plasma mass spectrometry with application to rock weathering

Schuessler

Blanckenburg

2014

Spectrochimica Acta Part B: Atomic Spectroscopy

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“…Laser-Ablation MC-ICPMS (LA-MC-ICPMS) and Secondary Ionisation Mass Spectrometry (SIMS) can be used to make in situ analyses of d 11 B in foraminifera (Rollion-Bard and Erez 2010; Fietzke et al 2010;Kaczmarek et al 2015). Until recently, the precision of these methods has been relatively low, due to low count rates.…”

Section: In Situ Analysismentioning

confidence: 99%

Boron Isotopes in Foraminifera: Systematics, Biomineralisation, and CO2 Reconstruction

Rae

2017

Advances in Isotope Geochemistry

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The boron isotope composition of foraminifera provides a powerful tracer for CO 2 change over geological time. This proxy is based on the equilibrium of boron and its isotopes in seawater, which is a function of pH. However while the chemical principles underlying this proxy are well understood, its reliability has previously been questioned, due to the difficulty of boron isotope (d 11 B) analysis on foraminferal samples and questions regarding calibrations between d 11 B and pH. This chapter reviews the current state of the d 11 B-pH proxy in foraminfera, including the pioneering studies that established this proxy's potential, and the recent work that has improved understanding of boron isotope systematics in foraminifera and applied this tracer to the geological record. The theoretical background of the d 11 B-pH proxy is introduced, including an accurate formulation of the boron isotope mass balance equations. Sample preparation and analysis procedures are then reviewed, with discussion of sample cleaning, the potential influence of diagenesis, and the strengths and weaknesses of boron purification by column chromatography versus microsublimation, and analysis by NTIMS versus MC-ICPMS. The systematics of boron isotopes in foraminifera are discussed in detail, including results from benthic and planktic taxa, and models of boron incorporation, fractionation, and biomineralisation. Benthic taxa from the deep ocean have d 11 B within error of borate ion at seawater pH. This is most easily explained by simple incorporation of borate ion at the pH of seawater. Planktic foraminifera have d 11 B close to borate ion, but with minor offsets. These may be driven by physiological influences on the Electronic supplementary material The online version of this chapter

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“…sewage, cattle, hogs and poultry) is seen on plots of б 11 B vs. 1/B (WIDORY et al, 2004). The measurements of boron isotopes were performed on a Thermo Fisher AXIOM MC-ICP-MS (Multicollector-Inductively Coupled Plasma Mass Spectrometer) equipped with an ESI New Wave Research LFC (large format cell) (FIETZKE et al, 2010).…”

Section: Stable Isotopes Of Boronmentioning

confidence: 99%

Multi-isotope approach for the identification and characterisation of nitrate pollution sources in the Marano lagoon (Italy) and parts of its catchment area

Saccon

Leis

Marca

et al. 2013

Applied Geochemistry

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Boron isotope ratio determination in carbonates via LA-MC-ICP-MS using soda-lime glass standards as reference material

Cited by 63 publications

References 33 publications

Testing the limits of micro-scale analyses of Si stable isotopes by femtosecond laser ablation multicollector inductively coupled plasma mass spectrometry with application to rock weathering

Testing the limits of micro-scale analyses of Si stable isotopes by femtosecond laser ablation multicollector inductively coupled plasma mass spectrometry with application to rock weathering

Boron Isotopes in Foraminifera: Systematics, Biomineralisation, and CO2 Reconstruction

Multi-isotope approach for the identification and characterisation of nitrate pollution sources in the Marano lagoon (Italy) and parts of its catchment area

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