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  • Royal Society of Chemistry  (7)
  • Blackwell Publishing Ltd  (3)
  • Universität Göttingen  (3)
  • 1
    Electronic Resource
    Electronic Resource
    A Reflection on Mg, Cd, Ca, Li and Si Isotopic Measurements and Related Reference Materials (2004)
    Oxford, UK : Blackwell Publishing Ltd
    Geostandards and geoanalytical research 28 (2004), S. 0 
    Details
    ISSN: 1751-908X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: This contribution aims to report the reflections we had with the scientific community during two international workshops on reference materials for stable isotopes in Davos (2002) and Nice (2003). After evaluating the isotopic homogeneity of some existing reference materials, based on either certificates, literature data or specific inter-laboratory rounds, we confirm these as primary reference materials or propose new ones relative to which stable isotope compositions should be reported. We propose DSM-3 for Mg, NIST SRM 915a for Ca, L-SVEC for Li and NBS28 for Si. Cadmium does not yet have a well identified delta zero material, although three commercial mono-elemental Cd solutions have yielded the same isotopic composition relative to one another. In order to scale the linearity of any mass spectrometer, some secondary reference materials are also proposed: Cambridge-1 solution for Mg, the “Münster-Cd” and JEPPIM Cd solutions for Cd and the “Big Batch” silicate for Si. The team from Nancy propose to prepare a mixed spike solution for Li isotopes. Well-characterised natural samples such as ocean or continental waters, diatoms, sponges, rocks and minerals are needed to validate the entire analytical procedure, particularly to take into account the effect of sample mineralisation and of chemical manipulations for elemental separation prior to analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1751-908X.2004.tb01050.x
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetostratigraphic Data From Late Quaternary Sediments From the Yermak Plateau, Arctic Ocean: Evidence For Four Geomagnetic Polarity Events Within the Last 170 Ka of the Brunhes Chron (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 117 (1994), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Palaeomagnetic investigations of two sediment cores recovered from RV Polarstern near the eastern slope of the Yermak Plateau (sites PS 1533 and PS 2212) reveal convincing evidence for four polarity events of the Earth's magnetic field during the last 170 Ka. A comprehensive rock magnetic study of the sediments proved that fine-grained magnetite is the principal carrier of the remanent magnetization. No changes in magneto-mineralogy across the polarity transitions in the sediments investigated were found. Calcareous nannofossil biostratigraphy, AMS-14C (accelerated mass spectrometry) and oxygen isotope data, and 10Be and 230Th stratigraphies yielded age ranges of 24–29 Ka for the Mono Lake event, 34–43 Ka for the Laschamp event, 72–86 Ka for the Norwegian-Greenland Sea event and 118–128 Ka for the Blake event. Two reverse polarity samples at the base of core PS 2212–3 KAL are interpreted as the termination of the Biwa I event (171-181 Ka). the events exhibit full inversion of inclination in both cores. the data suggest that the transition process of the Earth's magnetic field during such polarity events requires some 1 Ka.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1994.tb03944.x
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  • 3
    Electronic Resource
    Electronic Resource
    Proposal for International Agreement on Ca Notation Resulting from Discussions at Workshops on Stable Isotope Measurements Held in Davos (Goldschmidt 2002) and Nice (EGS-AGU-EUG 2003) (2004)
    Oxford, UK : Blackwell Publishing Ltd
    Geostandards and geoanalytical research 28 (2004), S. 0 
    Details
    ISSN: 1751-908X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A proposal is made to standardise the reporting of Ca isotope data to the δ44Ca/40Ca notation (or δ44Ca/42Ca) and to adopt NIST SRM 915a as the reference standard.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1751-908X.2004.tb01051.x
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  • 4
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    An alternative data acquisition and evaluation strategy for improved isotope ratio precision using LA-MC-ICP-MS applied to stable and radiogenic strontium isotopes in carbonates (2008)
    Royal Society of Chemistry
    In:  Journal of Analytical Atomic Spectrometry, 23 (7). pp. 955-961.
    Details
    Publication Date: 2017-06-07
    Description: Strontium isotopes in various marine carbonates were determined using an “AXIOM” MC-ICP-MS in combination with a NewWave UP193 laser ablation unit. Using a modified measurement and data reduction strategy, an external reproducibility of 87Sr/86Sr ratios in carbonates of about 19 ppm (RSD) was achieved. For recent and sub-recent marine carbonates a mean radiogenic strontium isotope ratio 87Sr/86Sr of 0.709170 ± 0.000007 (2SE) was determined, which agrees well with the value of 0.7091741 ± 0.0000024 (2SE) reported for modern sea water (J. M. McArthur, D. Rio, F. Massari, D. Castrodi, T. R. Bailey, M. Thirlwall and S. Houghton, Palaeogeogr. Palaeoclimatol. Palaeoeco., 2006, 242(126), 2006). Compared to published laser-based methods, an improved accuracy and precision was achieved by applying a new data reduction protocol using the simultaneous responses of all isotopes measured. The latter is considered as a new principal approach for isotope ratio evaluation using LA-MC-ICP-MS. A major advantage of the presented method is the direct determination of the stable strontium isotope fractionation. Providing reproducible sample ablation, introduction into the plasma and stable plasma condition, this method excludes the efforts of a quantitative strontium recovery after ion chromatographic separation to avoid additional fractionation of the sample strontium due to chemical pre-treatment/separation (ion chromatography and solution preparation), and is therefore, together with the quicker sample preparation and spatially resolved analysis, advantageous when compared to published solution–nebulization bracketing-standard MC-ICP-MS methods for stable strontium isotope determination.
    Type: Article , PeerReviewed
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  • 5
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    Coral and reef growth in the Western Indian Ocean (La Réunion, Mayotte, and Seychelles) (1996)
    Universität Göttingen
    In:  In: Global and regional controls on biogenic sedimentation. I. Reef evolution. Research reports. , ed. by Reitner, J., Neuweiler, F. and Gunkel, F. Göttinger Arbeiten zur Geologie und Paläontologie, Sb 2 . Universität Göttingen, Göttingen, pp. 23-27.
    Details
    Publication Date: 2019-09-23
    Type: Book chapter , NonPeerReviewed
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  • 6
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    Precise determination of delta Sr-88/86 in natural samples by double-spike MC-ICP-MS and its TIMS verification (2013)
    Royal Society of Chemistry
    In:  Journal of Analytical Atomic Spectrometry, 28 (6). p. 940.
    Details
    Publication Date: 2017-06-09
    Description: delta Sr-88/86 values of standards and a variety of natural samples were measured by MC-ICP-MS using the double-spike (DS) method and compared to results obtained by the standard-sample-bracketing (SSB) method and to DS-TIMS measurements. The external reproducibility of the SRM987 measurements carried out by DS-MC-ICP-MS was 0.021 parts per thousand (1SD), slightly better than previously published DS-TIMS and SSB-MC-ICP-MS results. The value of the IAPSO seawater standard (0.388 +/- 0.018; 2SEM) agrees with the results of the current SSB and DS-TIMS measurements and with previously published values. Using these values a variance-weighted mean for seawater was calculated (0.387 +/- 0.002, 2SEM). Compared to measurements carried out by the SSB method, natural sample measurements by the DS method are more accurate and more precise. An excellent agreement between DS-MC-ICP-MS and DS-TIMS methods was demonstrated for delta Sr-88/86 determination in natural samples over a range of similar to 0.5 parts per thousand. The DS-TIMS delta Sr-88/86 results had a smaller standard error than the DS-MC-ICP-MS measurements but required a much longer acquisition time
    Type: Article , PeerReviewed
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  • 7
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    Boron isotope ratio determination in carbonates /via/ LA-MC-ICP-MS using soda-lime glass standards as reference material (2010)
    Royal Society of Chemistry
    In:  Journal of Analytical Atomic Spectrometry, 25 (12). pp. 1953-1957.
    Details
    Publication Date: 2019-09-24
    Description: A new in situ method using LA-MC-ICP-MS (193 nm excimer laser) for the determination of stable boron isotope ratios (δ11B) in carbonates was developed. Data were acquired via a standard sample standard bracketing procedure typically providing a reproducibility of 0.5‰ (SD) for samples containing 35 ppm of boron. A single ablation interval consumed about 5 µg of sample corresponding to about 0.2 ng of boron. The major finding was the similar instrumental fractionation behaviour of carbonates, soda-lime glass and sea salt with respect to boron isotopes. As no matrix induced offset was detectable between these distinct materials we propose the use of NIST glasses as internal standards for boron isotope ratio measurements via LA-MC-ICP-MS. This finding overcomes the problem of a missing matrix matched carbonate standard for in situ boron isotope studies. As a first application a set of coral samples from a culturing experiment was analysed. δ11B values range from 19.5 to 25‰ depending on the pH of the water used in the particular treatment. This is in good agreement with the results of earlier studies.
    Type: Article , PeerReviewed
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  • 8
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    Determination of uranium isotope ratios by multi-static MIC-ICP-MS: method and implementation for precise U- and Th-series isotope measurements (2005)
    Royal Society of Chemistry
    In:  Journal of Analytical Atomic Spectrometry, 20 . pp. 395-401.
    Details
    Publication Date: 2017-05-31
    Description: In order to improve and extend the application of U- and Th-series isotope measurements a new technique for MIC-ICP-MS (multiple ion counting inductively coupled plasma mass spectrometry) was developed. This method uses either two (double MIC) or three (triple MIC) multipliers to measure in static mode in turn the U-isotopes 233U, 234U, 235U and 236U. For online internal standardization, mass bias correction and cross calibration of the multipliers a 233U/236U double spike was used. Applying this method the level of 1‰ 2σ internal precision is reached in less than 30 min, consuming less than 5 ng of total U. The multi-static MIC-ICP-MS method improves the precision by a factor of 5 for U isotope measurement compared with TIMS and by a factor of 2 compared with published ICP-MS methods. Repeated measurements of uranium CRM-145 (otherwise NBL 112A) were performed to test the reproducibility and accuracy of the method. An average 234U/238U value of (5.285 84 ± 0.000 87) × 10−5 or a δ234U value of −36.96 ± 0.16, respectively, was determined for CRM-145 in good agreement with reference data. Based on the precisely determined U isotope ratios we furthermore developed a combined multi-static U- and Th-measurement method. This approach extends this new MIC-ICP-MS technique to those U- and Th-series isotope systems having no constant isotope ratio for normalization (e.g., 230Th/232Th, 230Th/229Th) and is the key for new approaches to determining 226Ra/228Ra and 231Pa/233Pa. The applicability of the methods presented here is demonstrated by accurate dating of very young corals (10–350 y).
    Type: Article , PeerReviewed
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  • 9
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    Holocene reef growth and recent carbonate production in the Red Sea (1996)
    Universität Göttingen
    In:  In: Global and regional controls on biogenic sedimentation. I. Reef evolution. Research reports. , ed. by Reitner, J., Neuweiler, F. and Gunkel, F. Göttinger Arbeiten zur Geologie und Paläontologie, Sb 2 . Universität Göttingen, Göttingen, pp. 13-17.
    Details
    Publication Date: 2016-02-23
    Description: Holocene reef growth, present date bioerosion .and recorded carbonate production were studied in the fringing reef at Aqaba, Red Sea. Water depth, wave impact as well as nutrient availability were considered. The carbonate production was measured for several coral samples. Samples of Porites-colonies were collected from several depths and sites near the Marine Science Station at Aqaba. Growth rate depends on water depth, size and age of colonies. Within the coral optimum of water depth growth rates vary between 5 and 16 mm/yr. Coral carbonate production was calculated on the base of annual growth increments and skeletal density using transects from shallow subtidal down to 40 m water depth. High resolution stable isotope data were measured to prove the origin of growth increments. Long-term trends of sea surface temperature and carbon isotope shift (1800-today) fit to the known global deviations. Bioerosion rates were determined using standard dead coral substrates exposed in different water depths and environmental settings. Rates vary between 0.6 and 1.4 kg/m2yr. Sediment export evaluated by means of simple sediment traps ranges between 0.3 and 0.7 kg/m2yr. Gross carbonate production, mainly built up by scleractinian corals, amounts to ca. 1.57 kg/m2yr. Bioerosion alters approx. 1.3 kg/m2yr of hard substrates into sediment. Sediment export is estimated to be ca. 0.4-0.6 kg/m2yr. Thus a net production of ca. 0.7 to 0.9 kg/m2yr should remain in the present reef, which is proved by the recorded carbonate production (reef drillings). Net production preserved in the reef can be given with ca. 800 kg/m2kyr (=0.8 kg/m2yr).
    Type: Book chapter , NonPeerReviewed
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  • 10
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    A simplified procedure for the determination of stable chlorine isotope ratios (δ37Cl) using LA-MC-ICP-MS (2008)
    Royal Society of Chemistry
    In:  Journal of Analytical Atomic Spectrometry, 23 (5). pp. 769-772.
    Details
    Publication Date: 2019-09-23
    Description: Stable chlorine isotopes (37Cl, 35Cl) are considered as important tracers of geochemical processes, especially in subduction zone systems. However, high-quality chlorine isotope data are scarcely available. Here we present a comparatively simple procedure for the precise and accurate determination of stable chlorine isotope ratios (δ37Cl) using LA-MC-ICP-MS. Chlorine was extracted from solid samples by pyrohydrolysis. After quantitative precipitation as AgCl the dried precipitates where analysed in a sample-standard bracketing approach using a weak laser ablation (0.3 J/cm2) for sample evaporation. Atlantic Ocean sea salt and the sea water standard IAPSO were used as SMOC (standard mean ocean chloride) for normalisation (δ37Cl = 0 ‰). The precision and accuracy of the presented method was validated analysing the reference materials JB-1a and JB-2. The chlorine isotope ratios of these standards were determined as δ37ClJB-1a = (−0.99 ± 0.06) ‰ and δ37ClJB-2 = (−0.60 ± 0.03) ‰ (errors 2SE), respectively, in accordance with published data. Applying the presented method a total amount of less than 1 μg of chlorine was consumed during a typical measurement including 10 ablation periods on the sample.
    Type: Article , PeerReviewed
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