Stable silicon isotope analysis on nanomole quantities using MC-ICP-MS with a hexapole gas-collision cell

Sun, Xiaole; Andersson, Per; Land, Magnus; Humborg, Christoph; Mörth, Carl‐Magnus

doi:10.1039/b911113a

Cited by 15 publications

(10 citation statements)

References 39 publications

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“…All samples were diluted to 2-3 mg1 −1 of Si and matrix matched with standards in 0.12 M SeaStar HCl. Further, all samples and standards were doped to contain 3 mg l −1 of Li (IPC-MS standard) to match the matrix of Vegacenter standards prepared by LiBO 2 fusion (Sun et al, 2010).…”

Section: Stable Si Isotopes Analysismentioning

confidence: 99%

Impact of Holocene climate change on silicon cycling in Lake 850, Northern Sweden

et al. 2021

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Diatom-rich sediment in a small subarctic lake (Lake 850) was investigated in a 9400 cal. yr BP sediment record in order to explore the impact of Holocene climate evolution on silicon cycling. Diatom stable silicon isotopes ([Formula: see text]) and biogenic silica (BSi) indicate that high BSi concentrations in sediment throughout the Holocene are associated with a lighter Si isotope source of dissolved silica (DSi), such as groundwater or freshly weathered primary minerals. Furthermore, higher BSi concentrations were favoured during the mid-Holocene by low detrital inputs and possibly a longer ice-free period allowing for more diatom production to occur. The diatom [Formula: see text] signature shows a link to changes in regional climate and is influenced by length of diatom growth period and hydrological fluctuations. Lighter Si isotopic values occur during the mid-Holocene, when climate is inferred to be more continental and drier, with pronounced seasonality. In contrast, a heavier Si isotopic signature is observed in the early and late Holocene, when oceanic influences are thought to be stronger and the climate wetter. The [Formula: see text] values have generally lighter signatures as compared with other studies, which supports a light DSi source.

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Section: Stable Si Isotopes Analysismentioning

confidence: 99%

Impact of Holocene climate change on silicon cycling in Lake 850, Northern Sweden

et al. 2021

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“…The reference material RM-8546 (former NBS-28) and laboratory standards IRMM-018, Big-Batch, and Diatomite used in the VegaCenter were prepared by another type of fusion with LiBO 2 (Sun et al, 2010). Thus, our alkaline NaOH fused NBS-28 and Diatomite standards (Georg et al, 2006), purified in identical way as the samples, were matrix matched to contain 3 mg l −1 Li IPC-MS standard.…”

Section: Stable Si Isotopes Analysesmentioning

confidence: 99%

Modern silicon dynamics of a small high-latitude subarctic lake

Zahajská¹,

Olid²,

Stadmark³

et al. 2020

Preprint

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Abstract. High biogenic silica (BSi) concentration occurs sporadically in lake sediments throughout the world, however, the processes leading to high BSi concentrations varies. While BSi formation and preservation is expected to occur in silica-rich environments with high dissolved silicon (DSi) concentrations such as volcanic and hydrothermal inputs, the factors and mechanisms explaining high DSi and BSi concentrations in lakes remain unclear. We explored the factors responsible for the high BSi concentration in sediments of a small, high-latitude subarctic lake (Lake 850). To do this, we combined measurements of variations in stream discharges, DSi concentrations and stable Si isotopes in both lake and stream water with measurements of BSi content in lake sediments. Water, radon, and Si mass balances revealed the importance of groundwater discharge as a main source of DSi to the lake, with groundwater-derived DSi inputs 3 times higher than those from ephemeral stream inlets. After including all external DSi sources (i.e., inlets and groundwater discharge) and estimating the total BSi accumulation in the sediment, we show that diatom production consumes up to 79 % of total DSi input. Additionally, low sediment accumulation rates were observed based on the dated core. Our findings thus demonstrate that groundwater discharge and low mass accumulation rate can account for the high BSi accumulation during the last 150 cal. yr BP. Globally, lakes have been estimated to retain one fifth of the annual DSi delivery into the ocean. Well constrained lake mass balances, such as presented here, bring clarity to those estimates of the terrestrial Si cycle sinks.

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“…Resolution sector field ICP-MS (HR-ICP-MS) was also employed for the determination of silicon concentrations by isotope dilution [26,27]. An hexapole collision/reaction cell based MC-ICP-MS was also used for silicon isotope ratio measurements in low resolution [28].…”

Section: Introductionmentioning

confidence: 99%

Silicon isotope ratio measurements by inductively coupled plasma tandem mass spectrometry for alteration studies of nuclear waste glasses

Gourgiotis

Ducasse

Barker

et al. 2017

Analytica Chimica Acta

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High-level, long-lived nuclear waste arising from spent fuel reprocessing is vitrified in silicate glasses for final disposal in deep geologic formations. In order to better understand the mechanisms driving glass dissolution, glass alteration studies, based on silicon isotope ratio monitoring of Si-doped aqueous solutions, were carried out in laboratories. This work explores the capabilities of the new type of quadrupole-based ICP-MS, the Agilent 8800 tandem quadrupole ICP-MS/MS, for accurate silicon isotope ratio determination for alteration studies of nuclear waste glasses. In order to avoid silicon polyatomic interferences, a new analytical method was developed using O as the reaction gas in the Octopole Reaction System (ORS), and silicon isotopes were measured in mass-shift mode. A careful analysis of the potential polyatomic interferences on SiO and SiO ion species was performed, and we found that SiO ion species suffer from important polyatomic interferences coming from the matrix of sample and standard solutions (0.5M HNO). For SiO, no interferences were detected, and thus, these ion species were chosen for silicon isotope ratio determination. A number of key settings for accurate isotope ratio analysis like, detector dead time, integration time, number of sweeps, wait time offset, memory blank and instrumental mass fractionation, were considered and optimized. Particular attention was paid to the optimization of abundance sensitivity of the quadrupole mass filter before the ORS. We showed that poor abundance sensitivity leads to a significant shift of the data away from the Exponential Mass Fractionation Law (EMFL) due to the spectral overlaps of silicon isotopes combined with different oxygen isotopes (i.e. SiOO, SiOO). The developed method was validated by measuring a series of reference solutions with different Si enrichment. Isotope ratio trueness, uncertainty and repeatability were found to be<0.2%, <0.5% and <0.6%, respectively. These performances meet the requirements of the studies of nuclear glasses alteration and open up possibilities to use this method for precise determination of silicon content in natural samples by Isotope Dilution.

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Stable silicon isotope analysis on nanomole quantities using MC-ICP-MS with a hexapole gas-collision cell

Cited by 15 publications

References 39 publications

Impact of Holocene climate change on silicon cycling in Lake 850, Northern Sweden

Impact of Holocene climate change on silicon cycling in Lake 850, Northern Sweden

Modern silicon dynamics of a small high-latitude subarctic lake

Silicon isotope ratio measurements by inductively coupled plasma tandem mass spectrometry for alteration studies of nuclear waste glasses

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