High-precision molybdenum isotope analysis by negative thermal ionization mass spectrometry

Worsham, E. A.; Walker, Richard J.; Bermingham, K. R.

doi:10.1016/j.ijms.2016.06.005

Cited by 25 publications

(20 citation statements)

References 43 publications

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“…For Mo, additional Ti and Zr separation may also be achieved using the final column protocol of Worsham et al . (). For W, Step 3 used 140 μl AG 1‐X8, 100–200 mesh anion exchange resin in a column constructed in the top of a 5 ml polypropylene bulb pipet or a microcolumn constructed from shrinkable Teflon (shown here).…”

Section: Use Of Acetic and Citric Acids For Ti‐w And Ti‐mo Separationmentioning

confidence: 97%

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Chemical Separation of Tungsten and Other Trace Elements for TIMS Isotope Ratio Measurements Using Organic Acids

Peters

Mundl‐Petermeier

Horan

et al. 2019

Geostandard Geoanalytic Res

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One requirement for isotope ratio measurement results with small measurement uncertainties is that the element of interest is effectively separated from the sample matrix. Efficient chemical separation of W from matrix components, especially Ti, can be challenging, particularly for large test portion masses (> 1 g). We present a new W separation procedure that takes advantage of the distinct complexation behaviour of Ti and W with citrate ligand in a moderately low pH, oxidising solution. This preparation procedure can reduce the Ti/W ratio of large (4–10 g) basaltic (i.e., high‐matrix) test portions by a factor of 105, relative to their original compositions, in a two‐step separation procedure. The procedure additionally provides a separate, well‐purified Mo fraction. We show that optimal separation requires precise selection of reagent concentrations and sample load. The procedure was employed to determine the μ182W composition of BHVO‐2 as −6.7 ± 4.2 (2 standard deviation, 2s). The principles derived from this method may prove useful for chemical separation of other elements used for geochemical and cosmochemical applications given an appropriate selection of organic acid. Future successful applications of this method may reveal that the use of organic acids as procedural reagents is a currently under‐utilised tool for efficient chemical separation protocols.

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Section: Use Of Acetic and Citric Acids For Ti‐w And Ti‐mo Separationmentioning

confidence: 97%

“…Alternatively, the final separation protocol of Worsham et al . () can be used for additional Mo separation from Ti and Zr.…”

Section: Use Of Acetic and Citric Acids For Ti‐w And Ti‐mo Separationmentioning

confidence: 99%

Chemical Separation of Tungsten and Other Trace Elements for TIMS Isotope Ratio Measurements Using Organic Acids

Peters

Mundl‐Petermeier

Horan

et al. 2019

Geostandard Geoanalytic Res

Self Cite

View full text Add to dashboard Cite

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“… , Nagai and Yokoyama , Worsham et al . , Archer et al . 2017b) or maximise the precision for low signal intensities that result from either very low isotopic abundances (Walker , Naumenko et al .…”

Section: Advances In Thermal Ionisation Mass Spectrometrymentioning

confidence: 99%

“… , Worsham et al . ), using the iterative calculations advocated by Nagai and Yokoyama () or the normalisation technique used by Touboul and Walker (). Examples of this approach have recently been published on research of small isotopic variations (at the levels of ppm) for Mo with x = 100 (Nagai and Yokoyama , Worsham et al .…”

Section: Advances In Thermal Ionisation Mass Spectrometrymentioning

confidence: 99%

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GGR Biennial Critical Review: Analytical Developments Since 2014

Linge

Bèdard

Bugoi

et al. 2017

Geostandard Geoanalytic Res

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This GGR biennial critical review covers developments and innovations in key analytical methods published since January 2014, relevant to the chemical, isotopic and crystallographic characterisation of geological and environmental materials. In nine selected analytical fields, publications considered to be of wide significance are summarised, background information is provided and their importance evaluated. In addition to instrumental technologies, this review also presents a summary of new developments in the preparation and characterisation of rock, microanalytical and isotopic reference materials, including a précis of recent changes and revisions to ISO guidelines for reference material characterisation and reporting. Selected reports are provided of isotope ratio analyses by both solution-nebulisation MC-ICP-MS and laser ablation-ICP-MS, as well as of radioactive isotope geochronology by LA-ICP-MS. Most of the analytical techniques elaborated continue to provide new applications for geochemical analysis, however it is noted that instrumental neutron activation analysis has become less popular in recent years, mostly due to the reduced availability of nuclear reactors to act as a neutron source. Many of the newer applications reported here provide analysis at increasingly finer resolution. Examples include atom probe tomography, a very sensitive method providing atomic scale information, nanoscale SIMS, for isotopic imaging of geological and biological samples, and micro-XRF, which has a spatial resolution many orders of magnitude smaller than conventional XRF

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Isotopic analysis of sub‐nanogram neodymium loads using new ATONA™ amplifiers

Reinhard

Inglis

Steiner

et al. 2021

Rapid Comm Mass Spectrometry

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Rationale Emerging research in the geological and nuclear forensics fields demands increasing analytical precision of isotope ratio measurements with decreasing sample sizes. Here we demonstrate the capability of a newly developed amplification technology to make precise neodymium (Nd) isotopic measurements on 100‐pg standard loads. Methods The reference materials were analyzed as NdO+ to increase the ionization efficiency of the small analyte loads. The Nd isotopic measurements were made using an IsotopX Isoprobe‐T thermal ionization mass spectrometer upgraded with the ATONA™ amplifier system. The ATONA™ amplifier system uses capacitance‐based amplification as opposed to traditional impedance‐based amplification. Results The long‐term gains of the ATONA™ amplifiers are shown to have less than 1 ppm variability. Repeat measurements of the JNdi‐1 reference material demonstrate the ability of the ATONA™ amplification technology to make measurements of 143Nd/144Nd ratios with 23 ppm external reproducibility on 100‐pg loads. The effect of increasing integration time on analytical reproducibility is also displayed as increasing integration time from 10 to 30 s reduced the external measurement uncertainty from 37 to 23 ppm. Conclusions These measurements represent an improvement of more than a factor of 3 in external measurement reproducibility relative to previously published 143Nd/144Nd measurements of 100‐pg loads. This new technology will allow for the measurement of smaller samples for precise isotope ratios and open new avenues of research in the geological and nuclear forensic communities.

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High-precision molybdenum isotope analysis by negative thermal ionization mass spectrometry

Cited by 25 publications

References 43 publications

Chemical Separation of Tungsten and Other Trace Elements for TIMS Isotope Ratio Measurements Using Organic Acids

Chemical Separation of Tungsten and Other Trace Elements for TIMS Isotope Ratio Measurements Using Organic Acids

GGR Biennial Critical Review: Analytical Developments Since 2014

Isotopic analysis of sub‐nanogram neodymium loads using new ATONA™ amplifiers

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