Low-memory, small sample size, accurate and high-precision determinations of lithium isotopic ratios in natural materials by MC-ICP-MS

Huang, Kuo-Fang; You, Chen–Feng; Liu, Yung-Hsin; Wang, Ruomei; Lin, Pei Yu; Chung, Chen-Kuei

doi:10.1039/b926327f

Cited by 60 publications

(67 citation statements)

References 30 publications

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“…The accuracy and reproducibility of the whole method was validated using the USGS rock standards (BCR-2, BHVO-2, and BIR-1) and seawater standards (IAPSO and NASS-5). BCR-2 yielded 3.5 ± 0.2& (2r, n = 22), BHVO-2 yielded 4.5 ± 0.4& (2r, n = 5), BIR-1 yielded 3.3 ± 0.6& (2r, n = 5), IAPSO yielded 30.9 ± 0.2& (2r, n = 29), and NASS-5 yielded 30.6 ± 0.5& (2r, n = 15), which were all in good agreement with reported values (e.g., You and Chan, 1996;Moriguti and Nakamura, 1998;Tomascak et al, 1999;Nishio and Nakai, 2002;Magna et al, 2004;Huang et al, 2010;Ludwing et al, 2011).…”

Section: Sr and LI Isotope Analysessupporting

confidence: 79%

Variation of lithium isotope geochemistry during basalt weathering and secondary mineral transformations in Hawaii

Ryu

Vigier

Lee

et al. 2014

Geochimica et Cosmochimica Acta

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Lithium isotopes are a potential tracer of silicate weathering but the relationship between lithium isotope compositions and weathering state still need to be established with precision. Here, we report Li concentrations and Li isotope compositions of soils developed along a 4 million year humid-environment chronosequence in the Hawaiian Islands. Li concentrations are variable with depth and age, ranging from 0.24 to 21.3 ppm, and significant Li depletions (up to 92%) relative to parent basalts are systematically enhanced towards the surface. Our calculations show that the relative contribution from atmospheric deposits to the Li soil budget remains small, with a maximum contribution from dust Li of 20% at the oldest site. This is explained by the capacity of the weathering products to retain, within the profiles, the Li coming from basalt alteration, and allows us to explore more specifically the role of alteration processes on soil Li isotope signatures. The d Li values for the older soils (P20 ka) vary non-linearly as a function of time and can be explained by progressive mineral transformations starting with the synthesis of metastable short-range order (nano-crystalline) minerals and followed by their transformation into relatively inert secondary minerals. Results highlight significant Li isotope fractionation during secondary mineral formation and in particular during Li uptake by kaolinite. Finally, we suggest that the non-monotonous evolution of the regolith d 7 Li value over the last 4 Ma is consistent with climatic variations, where congruent release of Li isotopes occurs during warmer periods.

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Section: Sr and LI Isotope Analysessupporting

confidence: 79%

Variation of lithium isotope geochemistry during basalt weathering and secondary mineral transformations in Hawaii

Ryu

Vigier

Lee

et al. 2014

Geochimica et Cosmochimica Acta

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“…In scleractinian corals, d 18 O is out of equilibrium (McConnaughey, 1989) and displays variations at the small and microscale, as shown for L. pertusa, P. lutea and Desmophyllum (Adkins et al, 2003;Rollion-Bard et al, 2003). The Li isotope composition of corals scatters closely around values observed for inorganically precipitated aragonite (Marriott et al, 2004a;Rollion-Bard et al, 2009;Huang et al, 2010a). Notably, the fractionation in D 44/40 Ca in aragonitic warm water corals including Acropora sp.…”

Section: Resultsmentioning

confidence: 69%

Magnesium stable isotope fractionation in marine biogenic calcite and aragonite

Wombacher

Eisenhauer

Böhm

et al. 2011

Geochimica et Cosmochimica Acta

176

155

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“…Several studies have highlighted the importance of accurate concentration matching between samples and the bracketing standard during isotope analysis. Instrumental backgrounds with very light δ 7 Li compositions (−200‰) have been shown to cause analytical artefacts on measured 7 Li/ 6 Li when the concentrations of the bracketing standard and sample have deviated by more than 50% . Concentrations of samples and standards were therefore matched to within ±10% of each other in this study.…”

Section: Discussionmentioning

confidence: 99%

“…Isotope ratio determination of Li and Mg is achieved by multi‐collector inductively coupled plasma mass spectrometry (MC‐ICPMS). Due to potential isobaric interferences from doubly charged species generated in the plasma, and the effect of other matrix elements on the instrumental mass bias, it is necessary to analyse purified mono‐elemental solutions (e.g …”

Section: Introductionmentioning

confidence: 99%

High‐precision determination of lithium and magnesium isotopes utilising single column separation and multi‐collector inductively coupled plasma mass spectrometry

Bohlin

Misra

Lloyd

et al. 2017

Rapid Comm Mass Spectrometry

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RationaleLi and Mg isotopes are increasingly used as a combined tool within the geosciences. However, established methods require separate sample purification protocols utilising several column separation procedures. This study presents a single‐step cation‐exchange method for quantitative separation of trace levels of Li and Mg from multiple sample matrices.MethodsThe column method utilises the macro‐porous AGMP‐50 resin and a high‐aspect ratio column, allowing quantitative separation of Li and Mg from natural waters, sediments, rocks and carbonate matrices following the same elution protocol. High‐precision isotope determination was conducted by multi‐collector inductively coupled plasma mass spectrometry (MC‐ICPMS) on the Thermo Scientific™ NEPTUNE Plus™ fitted with 1013 Ω amplifiers which allow accurate and precise measurements at ion beams ≤0.51 V.ResultsSub‐nanogram Li samples (0.3–0.5 ng) were regularly separated (yielding Mg masses of 1–70 μg) using the presented column method. The total sample consumption during isotopic analysis is <0.5 ng Li and <115 ng Mg with long‐term external 2σ precisions of ±0.39‰ for δ7Li and ±0.07‰ for δ26Mg. The results for geological reference standards and seawater analysed by our method are in excellent agreement with published values despite the order of magnitude lower sample consumption.ConclusionsThe possibility of eluting small sample masses and the low analytical sample consumption make this method ideal for samples of limited mass or low Li concentration, such as foraminifera, mineral separates or dilute river waters.

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Low-memory, small sample size, accurate and high-precision determinations of lithium isotopic ratios in natural materials by MC-ICP-MS

Cited by 60 publications

References 30 publications

Variation of lithium isotope geochemistry during basalt weathering and secondary mineral transformations in Hawaii

Variation of lithium isotope geochemistry during basalt weathering and secondary mineral transformations in Hawaii

Magnesium stable isotope fractionation in marine biogenic calcite and aragonite

High‐precision determination of lithium and magnesium isotopes utilising single column separation and multi‐collector inductively coupled plasma mass spectrometry

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