Analysis of mass dependent and mass independent selenium isotope variability in black shales

Strandmann, Philip A.E. Pogge von; Coath, C. D.; Catling, David C.; Poulton, Simon W.; Elliott, Tim

doi:10.1039/c4ja00124a

Cited by 24 publications

(25 citation statements)

References 46 publications

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“…Over a measurement period of about 30 minutes average Se signals of ~1-2 V were observed for 500 ng Se, which is slightly higher compared to literature data for other TIMS measurements [13]. Current ICP-MS-based methods use similar to significantly less amounts of Se [4,18].…”

Section: Resultsmentioning

confidence: 64%

“…However, a large number of isobaric interferences like Ar 2 , ArCl, Ge, NiO, and hydrides formed with Ar 2 , As, Ge, and Se require the application of on-peak zero corrections [19]. The details of this interference correction differ between the published studies and may be the reason for the observed discrepancies in the published Se isotope values of rock standards of up to 0.5 ‰ in δ 82/76 Se [4]. Furthermore, different ICP-MS instruments and HG systems result in different intensities of the interfering signals.…”

Section: Introductionmentioning

confidence: 98%

“…The abundance, isotope composition, and oxidation state of Se in environmental reservoirs is a subject of intense interest in many scientific disciplines [1]. Studies on the Se isotope composition focus on the present and past marine geochemistry [2][3][4][5][6][7], exogenic processes [8], the oxygenation of the atmosphere [9], and the biogeochemical cycling of Se [10][11][12][13][14][15][16][17]. Selenium can be found in four oxidation states in nature: +VI (selenate), +IV (selenite), 0 (elemental selenium) and -II (selenide).…”

Section: Introductionmentioning

confidence: 99%

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Selenium isotope analysis by N-TIMS: Potential and challenges

Vollstaedt

Mezger

Nägler

et al. 2016

International Journal of Mass Spectrometry

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The isotope composition of selenium (Se) can provide important constraints on biological, geochemical, and cosmochemical processes taking place in different reservoirs on Earth and during planet formation. To provide precise qualitative and quantitative information on these processes, accurate and highly precise isotope data need to be obtained. The currently applied ICP-MS methods for Se isotope measurements are compromised by the necessity to perform a large number of interference corrections. Differences in these correction methods can lead to discrepancies in published Se isotope values of rock standards which are significantly higher than the acclaimed precision. An independent analytical approach applying a double spike (DS) and state-of-the-art TIMS may yield better precision due to its smaller number of interferences and could test the accuracy of data obtained by ICP-MS approaches. This study shows that the precision of Se isotope measurements performed with two different Thermo Scientific™ Triton™ Plus TIMS is distinctly deteriorated by about ±1 ‰ (2 s.d.) due to δ 80/78 Se by a memory Se signal of up to several millivolts and additional minor residual mass bias which could not be corrected for with the common isotope fractionation laws. This memory Se has a variable isotope composition with a DS fraction of up to 20 % and accumulates with increasing number of measurements. Thus it represents an accumulation of Se from previous Se measurements with a potential addition from a sample or machine blank. Several cleaning techniques of the MS parts were tried to decrease the memory signal, but were not sufficient to perform precise Se isotope analysis. If these serious memory problems can be overcome in the future, the precision and 30 accuracy of Se isotope analysis with TIMS should be significantly better than those of the 31 current ICP-MS approaches. 32

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Section: Resultsmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Selenium isotope analysis by N-TIMS: Potential and challenges

Vollstaedt

Mezger

Nägler

et al. 2016

International Journal of Mass Spectrometry

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“…Se isotope ratios bear the potential to show historic redox changes in the ancient oceans through assessment of the Se isotopic signatures recorded in ancient sedimentary rocks [136]. Further, studies on mass independent fractionation of Se in accordance with mass independent fractionation of S isotopes has gained interest during the last years [137]. Se isotopes and Se isotopic fractionation in the context of the study of the mineral and trace element metabolism in humans was comprehensively discussed recently by Walczyk [84].…”

Section: Fig 4 Distribution Of Publications Between 2010 and 2015 Fomentioning

confidence: 99%

“…Since 2007, isotope pattern deconvolution involving enriched isotopes in biological entities has been successfully applied for e.g., 57 Fe in cucumber plants [164]; 74 Se and 77 Se in lactating rats [165] and 77 Se in human serum [166]; 135 Ba and 137 Ba in fish tissues [167,168]; 67 Zn and 70 Zn in rat brain thin sections [169,170]. The methodology has also been picked up for forensic and environmental applications such as the authentication of explosives tagged with a dual isotope spike of tin ( 117 Sn and 119 Sn) [171] or the analyses of platinum ( 194 Pt) in environmental samples [172].…”

Section: Isotopic Labeling Using Enriched Stable Isotopes (Extrinsic mentioning

confidence: 99%

Application of non-traditional stable isotopes in analytical ecogeochemistry assessed by MC ICP-MS - A critical review

Irrgeher

Prohaska

2015

Anal Bioanal Chem

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Analytical ecogeochemistry is an evolving scientific field dedicated to the development of analytical methods and tools and their application to ecological questions. Traditional stable isotopic systems have been widely explored and have undergone continuous development during the last century.The variations of the isotopic composition of light elements (H, O, N, C and S) have provided the foundation of stable isotope analysis followed by the analysis of traditional geochemical isotope tracers (e.g. Pb, Sr, Nd, Hf). Questions in a considerable diversity of scientific fields have been addressed, many of which can be assigned to the field of ecogeochemistry. Over the past fifteen years, other stable isotopes (e.g. Li, Zn, Cu, Cl) have emerged gradually as novel tools for the investigation of scientific topics that arise in ecosystem research and have enabled novel discoveries and explorations. These systems are often referred to as non-traditional isotopes.The small isotopic differences of interest that are increasingly being addressed for a growing number of isotopic systems represent a challenge to the analytical scientist and push the limits of today's instruments constantly. This underlines the importance of a metrologically sound concept of analytical protocols and procedures and a solid foundation of data processing strategies and uncertainty considerations before these small isotopic variations can be interpreted in the context of applied ecosystem research. This review focuses on the development of isotope research in ecogeochemistry, the requirements for successful detection of small isotopic shifts as well as highlights the most recent and innovative applications in the field. Keywordsanalytical ecogeochemistry, non-traditional stable isotopes, isotope tracers, MC ICP-MS, chemical metrology 2

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Chemical Sample Processing for Combined Selenium Isotope and Selenium‐Tellurium Elemental Investigation of the Earth's Igneous Reservoirs

Yierpan

König

Labidi

et al. 2018

Geochem Geophys Geosyst

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The redox‐sensitive, chalcophile, and volatile Se stable isotope system offers new perspectives to investigate the origin and evolution of terrestrial volatiles and the roles of magmatic and recycling processes in the development of the redox contrast between Earth's reservoirs. Selenium isotope systematics become more robust in a well‐constrained petrogenetic context as can be inferred from Se‐Te elemental signatures of sulfides and igneous rocks. In this study, we present a high‐yield chemical sample processing method that allows the determination of Se‐Te concentrations and Se isotope composition from the same sample digest of silicate rocks by hydride generation isotope dilution (ID) quadrupole inductively coupled plasma mass spectrometry (ICP‐MS) and double spike (DS) multicollector (MC)‐ICP‐MS, respectively. Our procedure yields ∼80% Se‐Te recoveries with quantitative separation of relevant interfering elements such as Ge and HG‐buffering metals. Replicate analyses of selected international reference materials yield uncertainties better than 0.11‰ (2 s.d.) on δ82/76Se and 3% (r.s.d.) on Se concentration for DS MC‐ICP‐MS determinations for as low as ∼10 ng sample Se. The precision of Se‐Te concentration measurements by ID ICP‐MS is better than 3% and 5% (r.s.d.) for total amounts of ∼0.5–1 ng Se and ∼0.2–0.5 ng Te, respectively. The basaltic reference materials have variable Se‐Te contents, but their δ82/76Se values are rather uniform (on average 0.23 ± 0.14‰; 2 s.d.) and different from the chondritic value. This altogether provides the methodology and potential to extend the limited data set of coupled Se isotope and Se‐Te elemental systematics of samples relevant to study the terrestrial igneous inventory.

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Analysis of mass dependent and mass independent selenium isotope variability in black shales

Abstract: The measurement of selenium isotope ratios is of increasing interest for understanding redox conditions in present and past surface environments.

Cited by 24 publications

References 46 publications

Selenium isotope analysis by N-TIMS: Potential and challenges

Selenium isotope analysis by N-TIMS: Potential and challenges

Application of non-traditional stable isotopes in analytical ecogeochemistry assessed by MC ICP-MS - A critical review

Chemical Sample Processing for Combined Selenium Isotope and Selenium‐Tellurium Elemental Investigation of the Earth's Igneous Reservoirs

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