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Stable silicon isotope analysis on nanomole quantities using MC-ICP-MS with a hexapole gas-collision cell
Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
Naturhistoriska riksmuseet, Laboratoriet för isotopgeologi .
WSP Environmental.
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
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2010 (English)In: Journal of Analytical Atomic Spectrometry, ISSN 0267-9477, E-ISSN 1364-5544, Vol. 25, no 2, 156-162 p.Article in journal (Refereed) Published
Abstract [en]

We demonstrate in this study that a single focusing multiple collector inductively coupled plasma massspectrometer (MC-ICP-MS) equipped with a hexapole gas-collision cell (GV-instrument Isoprobe) canprecisely determine the d29Si (2S.D., 0.2&) using a total Si consumption of less than 14 nmole (390 ngSi). Testing and evaluation of background, rinse time, and major matrix effects have been performed ina systematic way to establish a procedure to measure d29Si in small quantities. Chemical purificationprior to analysis is required to remove potential interferences. For data collected during a four-yearperiod, the average d29Si value of IRMM-018 relative to NBS-28 was found to be 0.95& (n ¼ 23,2S.D. 0.16&) with a 95% confidence interval (0.95 0.028&). The mean d29Si value of the Big-Batchstandard was found to be 5.50& (n ¼ 6, 2S.D. 0.26&). Although determination of the d30Simeasurements is not possible, with our current instrument we demonstrate that this system providesa fast and long-term reliable method for the analysis of d29Si in purified samples with low Siconcentration (18 mM Si).

Place, publisher, year, edition, pages
2010. Vol. 25, no 2, 156-162 p.
Keyword [en]
silicon isotopes, MC-ICP-MS
National Category
Analytical Chemistry
Research subject
URN: urn:nbn:se:su:diva-37447DOI: 10.1039/b911113aISI: 000273962800006OAI: diva2:302133
Silicon isotope-based reconstruction of silicon cycle and diatom production in the Baltic Sea; implications for climate change and eutrophication
Available from: 2011-01-05 Created: 2010-03-04 Last updated: 2012-09-10Bibliographically approved
In thesis
1. Isotope-based reconstruction of the biogeochemical Si cycle: Implications for climate change and human perturbation
Open this publication in new window or tab >>Isotope-based reconstruction of the biogeochemical Si cycle: Implications for climate change and human perturbation
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The global silicon (Si) cycle is of fundamental importance for the global carbon cycle. Diatom growth in the oceans is a major sequestration pathway for carbon on a global scale (often referred to as the biological pump). Patterns of diatoms preserved in marine sediment records can reveal both natural and anthropogenic driven environmental change, which can be used to understand silicon dynamics and climate change. Si isotopes have been shown to have great potential in order to understand the Si cycle by revealing both past and present patterns of dissolved Si (DSi) utilization, primarily when diatoms form their siliceous frustules (noted as biogenic silica, BSi). However, studies using Si isotopes are still scarce and only a few studies exist where stable Si isotopes are used to investigate the biogeochemical Si cycle in aquatic systems. Therefore, this thesis focuses on developing analytical methods for studying BSi and DSi and also provides tools to understand the observed Si isotope distribution, which may help to understand impacts of climate change and human perturbations on marine ecosystems. The Baltic Sea, one of the biggest estuarine systems in the world, was chosen as the study site. BSi samples from a sediment core in Bothnian Bay, the most northern tip of the Baltic Sea, and diatom samples from the Oder River, draining into the southern Baltic Sea were measured and reported in Paper II and III, after establishing a method for Si isotope measurements (Paper I). Si isotope fractionation during diatom production and dissolution was also investigated in a laboratory-controlled experiment (Paper IV) to validate the observations from the field. The major result is that Si isotope signatures in BSi can be used as an historical archive for diatom growth and also related to changes in climate variables. There is isotopic evidence that the Si cycle has been significantly altered in the Baltic Sea catchment by human activities. 

Place, publisher, year, edition, pages
Stockholm: Department of Geological Sciences, Stockholm University, 2012. 20 p.
Meddelanden från Stockholms universitets institution för geologiska vetenskaper, 351
diatoms, biogenic silica (BSi), dissolved Si (DSi), Si isotope fractionation, the Baltic Sea
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Research subject
urn:nbn:se:su:diva-79188 (URN)978-91-7447-559-3 (ISBN)
Public defence
2012-10-12, Ahlmansalen, Geovetenskapens hus, Svante Arrhenius väg 12, Stockholm, 10:00 (English)
Swedish Research Council, 2007-4763

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Manuscript. Paper 4: Manuscript.

Available from: 2012-09-20 Created: 2012-08-29 Last updated: 2013-04-09Bibliographically approved

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