Strontium isotope analysis of curved tooth enamel surfaces by laser-ablation multi-collector ICP-MS

Roux, Petrus le; Lee‐Thorp, Julia A.; Copeland, Sandi R.; Sponheimer, Matt; Ruiter, Darryl J. de

doi:10.1016/j.palaeo.2014.09.007

Cited by 27 publications

(18 citation statements)

References 9 publications

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“…To verify that all interferences are successfully removed, a tooth reference material (Otomys 26‐r52) is measured three times before and after a sample is measured (an experiment comprises typically 15–40 line scans on one specimen). The average of 37 analyses during the measurement session yielded a 87 Sr/ 86 Sr ratio of 0.72050 ± 0.00054, which agrees well with the value determined by thermal ionization mass spectrometry (0.720525 ± 0.000090; Finnigan Triton, Thermo Scientific, Waltham, MA, USA) at the Swedish Museum of Natural History (Stockholm, Sweden).…”

Section: Methodsmentioning

confidence: 69%

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Intra‐ and inter‐tooth variation in strontium isotope ratios from prehistoric seals by laser ablation multi‐collector inductively coupled plasma mass spectrometry

Glykou

Eriksson

Storå

et al. 2018

Rapid Comm Mass Spectrometry

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RationaleStrontium isotope ratios (87Sr/86Sr) in modern‐day marine environments are considered to be homogeneous (~0.7092). However, in the Baltic Sea, the Sr ratios are controlled by mixing seawater and continental drainage from major rivers discharging into the Baltic. This pilot study explores if variations in Sr can be detected in marine mammals from archaeological sites in the Baltic Sea.Methods 87Sr/86Sr ratios were measured in tooth enamel from three seal species by laser ablation multi‐collector inductively coupled plasma mass spectrometry (LA‐MC‐ICP‐MS). The method enables micro‐sampling of solid materials. This is the first time that the method has been applied to marine samples from archaeological collections.ResultsThe analyses showed inter‐tooth 87Sr/86Sr variation suggesting that different ratios can be detected in different regions of the Baltic Sea. Furthermore, the intra‐tooth variation suggests possible different geographic origin or seasonal movement of seals within different regions in the Baltic Sea through their lifetime.ConclusionsThe method was successfully applied to archaeological marine samples showing that: (1) the 87Sr/86Sr ratio in marine environments is not uniform, (2) 87Sr/86Sr differences might reflect differences in ecology and life history of different seal species, and (3) archaeological mobility studies based on 87Sr/86Sr ratios in humans should therefore be evaluated together with diet reconstruction.

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Section: Methodsmentioning

confidence: 69%

“…To verify that all interferences are successfully removed, a tooth reference material (Otomys 26-r52 44…”

Section: Horizontal Sequential Samplingmentioning

confidence: 99%

Intra‐ and inter‐tooth variation in strontium isotope ratios from prehistoric seals by laser ablation multi‐collector inductively coupled plasma mass spectrometry

Glykou

Eriksson

Storå

et al. 2018

Rapid Comm Mass Spectrometry

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“…Further carbonate RMs for in situ laser analyses would allow to avoid extensive additional laboratory work, such as solution MC-ICP-MS or TIMS analyses of the same samples, or relying on modernday marine carbonates, which are believed to show the same 87 Sr/ 86 Sr ratio as modern-day seawater (Outridge et al 2002, Barnett-Johnson et al 2005, Woodhead et al 2005. Although LA-MC-ICP-MS analysis of Sr isotopes of phosphate materials is much more common (in particular teeth; Copeland et al 2008, Le Roux et al 2014, Willmes et al 2016, Lugli et al 2017b, only a few RMs for phosphate matrices are available (Yang et al 2014). The same is true for carbonate materials.…”

mentioning

confidence: 99%

Calcium Carbonate and Phosphate Reference Materials for Monitoring Bulk and Microanalytical Determination of Sr Isotopes

Weber

Lugli

Jochum

et al. 2017

Geostandard Geoanalytic Res

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In situ laser ablation analyses rely on the microanalytical homogeneity of reference materials (RMs) and a similar matrix and mass fraction between unknown samples and RMs to obtain reliable results. Suitable carbonate and phosphate RMs for determination of Sr isotope ratios in such materials are limited. Thus, we determined 87Sr/86Sr ratios of several carbonate (JCt-1, JCp-1, MACS-1, MACS-3) and phosphate (MAPS-4, MAPS-5, NIST SRM 1400, NIST SRM 1486) international RMs using dissolved samples and two different multi-collector inductively coupled plasma-mass spectrometers (MC-ICP-MS). Our Sr isotope data are in agreement with published data and have an improved measurement precision for some RMs. For MACS-1, we present the first 87Sr/86Sr value. We tested the suitability of these materials for microanalytical analyses by LA-MC-ICP-MS, with two different laser ablation systems: a conventional nanosecond laser and a state-of-the-art femtosecond laser. We investigated the RMs micro-homogeneity and compared the data with our solution data. Both laser ablation systems yielded identical 87Sr/86Sr ratios within uncertainty to the solution data for RMs with low interferences of REEs. Therefore, these carbonate and phosphate RMs can be used to achieve accurate and precise results for in situ Sr isotope investigations by LA-MC-ICP-MS of similar materials

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“…Previously, LA-MC-ICP-MS has been successfully applied for the spatially resolved determination of Sr isotope ratios in tooth enamel (Le Roux et al 2014). However, to the best of our knowledge, ns-LA-MC-ICP-MS has never been used for Sr isotopic determination in archaeological glasses.…”

mentioning

confidence: 99%

Assessment of Nanosecond Laser Ablation Multi‐Collector Inductively Coupled Plasma‐Mass Spectrometry for Pb and Sr Isotopic Determination in Archaeological Glass: Mass Bias Correction Strategies and Results for Corning Glass Reference Materials

Ham-Meert

Chernonozhkin

Malderen

et al. 2018

Geostandard Geoanalytic Res

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This work presents an evaluation of various methods for in situ high‐precision Sr and Pb isotopic determination in archaeological glass (containing 100–500 μg g−1 target element) by nanosecond laser ablation multi‐collector‐inductively coupled plasma‐mass spectrometry (ns‐LA‐MC‐ICP‐MS). A set of four soda‐lime silicate glasses, Corning A–D, mimicking the composition of archaeological glass and produced by the Corning Museum of Glass (Corning, New York, USA), were investigated as candidates for matrix‐matched reference materials for use in the analysis of archaeological glass. Common geological reference materials with known isotopic compositions (USGS basalt glasses BHVO‐2G, GSE‐1G and NKT‐1G, soda‐lime silicate glass NIST SRM 610 and several archaeological glass samples with known Sr isotopic composition) were used to evaluate the ns‐LA‐MC‐ICP‐MS analytical procedures. When available, ns‐LA‐MC‐ICP‐MS results for the Corning glasses are reported. These were found to be in good agreement with results obtained via pneumatic nebulisation (pn) MC‐ICP‐MS after digestion of the glass matrix and target element isolation. The presence of potential spectral interference from doubly charged rare earth element (REE) ions affecting Sr isotopic determination was investigated by admixing Er and Yb aerosols by means of pneumatic nebulisation into the gas flow from the laser ablation system. It was shown that doubly charged REE ions affect the Sr isotope ratios, but that this could be circumvented by operating the instrument at higher mass resolution. Multiple strategies to correct for instrumental mass discrimination in ns‐LA‐MC‐ICP‐MS and the effects of relevant interferences were evaluated. Application of common glass reference materials with basaltic matrices for correction of ns‐LA‐MC‐ICP‐MS isotope data of archaeological glasses results in inaccurate Pb isotope ratios, rendering application of matrix‐matched reference materials indispensable. Correction for instrumental mass discrimination using the exponential law, with the application of Tl as an internal isotopic standard element introduced by pneumatic nebulisation and Corning D as bracketing isotopic calibrator, provided the most accurate results for Pb isotope ratio measurements in archaeological glass. Mass bias correction relying on the power law, combined with intra‐element internal correction, assuming a constant 88Sr/86Sr ratio, yielded the most accurate results for 87Sr/86Sr determination in archaeological glasses

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Strontium isotope analysis of curved tooth enamel surfaces by laser-ablation multi-collector ICP-MS

Cited by 27 publications

References 9 publications

Intra‐ and inter‐tooth variation in strontium isotope ratios from prehistoric seals by laser ablation multi‐collector inductively coupled plasma mass spectrometry

Intra‐ and inter‐tooth variation in strontium isotope ratios from prehistoric seals by laser ablation multi‐collector inductively coupled plasma mass spectrometry

Calcium Carbonate and Phosphate Reference Materials for Monitoring Bulk and Microanalytical Determination of Sr Isotopes

Assessment of Nanosecond Laser Ablation Multi‐Collector Inductively Coupled Plasma‐Mass Spectrometry for Pb and Sr Isotopic Determination in Archaeological Glass: Mass Bias Correction Strategies and Results for Corning Glass Reference Materials

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