87 Sr/ 86 Sr isotope ratio measurements by laser ablation multicollector inductively coupled plasma mass spectrometry: Reconsidering matrix interferences in bioapatites and biogenic carbonates

Irrgeher, Johanna; Galler, Patrick; Prohaska, Thomas

doi:10.1016/j.sab.2016.09.008

Cited by 37 publications

(32 citation statements)

References 62 publications

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“…Rubidium, as a major potential isobaric interference for in situ Sr isotope analyses, yielded a mean mass fraction of 0.075 ± 0.036 µg g −1 ( n = 6, 2 s ). This results in a maximum Rb/Sr ratio of 0.0002, much lower than the suggested Rb/Sr threshold of 0.02 for successful LA‐(MC‐)ICP‐MS measurements of Sr isotopes (Irrgeher et al ). Further potential interfering elements yielded very low mass fractions (Dy = 0.16 ± 0.04 µg g −1 ; Er = 0.02 ± 0.04 µg g −1 ; Yb = 0.05 ± 0.04 µg g −1 , all uncertainties (2 s ) are for n = 6) and are thus considered to be negligible for in situ Sr isotope measurements, as has been shown for reference materials with a higher mass fraction of these elements (Weber et al ).…”

Section: Resultsmentioning

confidence: 87%

“…Rubidium as a major potential interference for in situ analyses of Sr isotopes only has a very low mass fraction (< 0.2 µg g −1 ), although yielding higher values than obtained by the other methods (Table and Figure ). However, the Rb mass fraction is still sufficiently low to not affect the Sr isotope measurements significantly (Irrgeher et al ). Magnesium and Ba are usually minor components of carbonate materials and were therefore monitored for the NanoSr pellet.…”

Section: Resultsmentioning

confidence: 99%

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NanoSr – A New Carbonate Microanalytical Reference Material for In Situ Strontium Isotope Analysis

Weber

Lugli

Hattendorf

et al. 2019

Geostandard Geoanalytic Res

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The in situ measurement of Sr isotopes in carbonates by MC‐ICP‐MS is limited by the availability of suitable microanalytical reference materials (RMs), which match the samples of interest. Whereas several well‐characterised carbonate reference materials for Sr mass fractions > 1000 µg g−1 are available, there is a lack of well‐characterised carbonate microanalytical RMs with lower Sr mass fractions. Here, we present a new synthetic carbonate nanopowder RM with a Sr mass fraction of ca. 500 µg g−1 suitable for microanalytical Sr isotope research (‘NanoSr’). NanoSr was analysed by both solution‐based and in situ techniques. Element mass fractions were determined using EPMA (Ca mass fraction), as well as laser ablation and solution ICP‐MS in different laboratories. The 87Sr/86Sr ratio was determined by well‐established bulk methods for Sr isotope measurements and is 0.70756 ± 0.00003 (2s). The Sr isotope microhomogeneity of the material was determined by LA‐MC‐ICP‐MS, which resulted in 87Sr/86Sr ratios of 0.70753 ± 0.00007 (2s) and 0.70757 ± 0.00006 (2s), respectively, in agreement with the solution data within uncertainties. Thus, this new reference material is well suited to monitor and correct microanalytical Sr isotope measurements of low‐Sr, low‐REE carbonate samples. NanoSr is available from the corresponding author.

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 99%

NanoSr – A New Carbonate Microanalytical Reference Material for In Situ Strontium Isotope Analysis

Weber

Lugli

Hattendorf

et al. 2019

Geostandard Geoanalytic Res

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“…Due to the previous corrections, mass 85 only consists of 85 Rb (Table 1), which can be used to calculate the fraction of 87 Rb by using the constant ratio of 87 Rb/ Rb = 0.3857 (Berglund and Wieser (2011) This was done following equation 5: respectively, m87 and m86 are the masses for Sr and α is the mass fractionation factor. This Rb correction is only considered robust for samples with a Rb/Sr ratio <0.02 (Irrgeher et al, 2016).…”

Section: Interference Of Rubidiummentioning

confidence: 99%

“…After calculating the interference-free 87 Sr/ Sr ratio, the results are calibrated by standardbracketing using RMs with well-known 87 Sr/ 86 Sr ratios, as has been recommended for Srisotope analysis (Irrgeher et al, 2016…”

Section: Data Processingmentioning

confidence: 99%

“…Therefore, it is essential to use a RM with similar Sr concentration and a similar matrix as the speleothem sample. By not using matrixmatched samples and RMs, potential differences in the occurrence of interference may alter the correction (Irrgeher et al, 2016). In case of different matrices and/or large differences in Sr concentration, the resulting 87 Sr/ 86 Sr ratio of the unknown sample needs to be handled with care and might be less precise.…”

Section: Tuning Parameters and Suitable Reference Materialsmentioning

confidence: 99%

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Sr-isotope analysis of speleothems by LA-MC-ICP-MS: High temporal resolution and fast data acquisition

et al. 2017

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Speleothems are well established climate archives. A wide array of geochemical proxies, including stable isotopes and trace elements are present within speleothems to reconstruct past climate variability. However, each proxy is influenced by multiple factors, often hampering robust interpretation. Sr isotope ratios (87Sr/86Sr) can provide useful information about water residence time and water mixing in the host rock, as they are not fractionated during calcite precipitation. Laser ablation multi-collector-inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) has rarely been used for determination of Sr isotope signatures in speleothems, as speleothems often do not possess appropriately high concentrations of Sr to facilitate this analysis. Yet the advantages of this approach include rapid data acquisition, higher spatial resolution, larger sample throughput and the absence of chemical treatment prior to analysis. We present LA-MC-ICP-MS Sr isotope data from two speleothems from Morocco (Grotte de Piste) and India (Mawmluh Cave), and we compare linescan and spot analysis ablation techniques along speleothem growth axes. The analytical uncertainty of our LA-MC-ICP-MS Sr data is comparable to studies conducted on other carbonate materials. The results of both ablation techniques are reproducible within analytical error, implying that this technique yields robust results when applied to speleothems. In addition, several comparative measurements of different carbonate reference materials (i.e. MACS-3, JCt-1, JCp-1), including tests with standard bracketing and comparison of the 87Sr/86Sr ratios with a nanosecond laser ablation system and a state-of-the-art femtosecond laser ablation system, highlight the robustness of the method

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Accurate Sr isotope determination of human bone and tooth samples by LA‐MC‐ICP‐MS: A comment on “Meijer et al., (2019)”

Lugli

2019

Intl J of Osteoarchaeology

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The in‐situ Sr isotope determination of low‐Sr bioapatites is challenging and requires monitoring several interferences, among others, Ar‐CaPO. In particular, the analysis of human bones and teeth has revealed several pitfalls, which affect the ability to obtain accurate results. In this commentary, I review the data from the paper of Meijer et al. (2019), trying to address some accuracy issues arising, in my opinion, from polyatomic interferences. After a tentative calibration of their data, using the 1/88Sr signal (V−1) as a proxy of the Sr content, the enamel specimens (enamel Ar‐CaPO corrected 87Sr/86Sr ratio = 0.7078 ± 0.0032; mean ± 2σ) are closer to the likely local bioavailable Sr (bone Ar‐CaPO corrected 87Sr/86Sr ratio = 0.7071 ± 0.0011; mean ± 2σ).

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87 Sr/ 86 Sr isotope ratio measurements by laser ablation multicollector inductively coupled plasma mass spectrometry: Reconsidering matrix interferences in bioapatites and biogenic carbonates

Cited by 37 publications

References 62 publications

NanoSr – A New Carbonate Microanalytical Reference Material for In Situ Strontium Isotope Analysis

NanoSr – A New Carbonate Microanalytical Reference Material for In Situ Strontium Isotope Analysis

Sr-isotope analysis of speleothems by LA-MC-ICP-MS: High temporal resolution and fast data acquisition

Accurate Sr isotope determination of human bone and tooth samples by LA‐MC‐ICP‐MS: A comment on “Meijer et al., (2019)”

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