Germanium isotope measurements of high-temperature geothermal fluids using double-spike hydride generation MC-ICP-MS

Siebert, Christopher; Ross, Andy; McManus, James

doi:10.1016/j.gca.2006.06.007

Cited by 41 publications

(56 citation statements)

References 46 publications

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“…The systematic shift of ∼0.4‰ when using the DSN implies additional mass bias effects which amplify uncertainties associated with the calibration session, in particular at extreme spike/sample ratios. This effect has been observed in other laboratories where the doublespike is employed [4,7,14,18,40] and may be related to mass bias changes which do not follow the exponential fractionation law ( [7] and references therein). However, this effect is easily overcome by normalizing the sample δ values to the daily average of spiked standards.…”

Section: Resultsmentioning

confidence: 59%

“…Of these three methods, the double-spike approach provides the most robust correction for instrumental and laboratory mass fractionation [4], and protocols are now in place for the isotopic analysis of several elements such as Ba, Ca, Cd, Hg, Ge, Mo, Ni, Pb, Pt, Se, U, and Zn [e.g., [6][7][8][9][10][11][12][13][14][15][16][17][18]. However, a more widespread adoption of double-spike protocols has been hindered by perceived difficulties in proper double-spike calibration, mathematical inversion [19], and fear of memory effects [20].…”

Section: Introductionmentioning

confidence: 99%

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A practical guide for the design and implementation of the double-spike technique for precise determination of molybdenum isotope compositions of environmental samples

2015

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The isotopic double-spike method allows for the determination of stable isotope ratios by multi-collector inductively coupled plasma-mass spectrometry (MC-ICP-MS) with accuracy and precision in the range of ∼0.02 ‰ amu(-1), but its adoption has been hindered by the perceived difficulties in double-spike calibration and implementation. To facilitate the implementation of the double-spike approach, an explanation of the calibration and validation of a (97)Mo-(100)Mo double-spike protocol is given in more detail than has been presented elsewhere. The long-term external standard reproducibility is 0.05 ‰ on δ(98/95)Mo measurements of standards. δ(98/95)Mo values for seawater and U.S. Geological Survey (USGS) reference materials SDO-1 and BCR-2 measured in this study are 2.13 ± 0.04 ‰ (2 SD, n = 3), 0.79 ± 0.05 ‰ (2 SD, n = 11), and -0.04 ± 0.10 ‰ (2 SD, n = 3) relative to the NIST-SRM-3134. The double-spike method corrects for laboratory and instrumental fractionation which are not accounted for using other mass bias correction methods. Spike/sample molar ratios between 0.4 and 0.8 provide accurate isotope measurements; outside of this range, isotope measurements are inaccurate but corrections are possible when standards and samples are spiked at a similar ratio.

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Section: Resultsmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

A practical guide for the design and implementation of the double-spike technique for precise determination of molybdenum isotope compositions of environmental samples

2015

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“…Stable isotope-ratio measurements using MC-ICP-MS have recently found a wider interest [206,[208][209][210][211]. While all isotopes can be used for stable isotope studies, subtle isotopic variations require an uncertainty of better than 0.1 ‰ using the R( 74 Ge/ 70 Ge) ratio; both isotopes have a relatively high abundance, and they exhibit the largest atomic mass difference.…”

Section: Germaniummentioning

confidence: 99%

Assessment of international reference materials for isotope-ratio analysis (IUPAC Technical Report)

Brand

Coplen

Vogl

et al. 2014

Pure and Applied Chemistry

528

436

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Abstract:Since the early 1950s, the number of international measurement standards for anchoring stable isotope delta scales has mushroomed from 3 to more than 30, expanding to more than 25 chemical elements. With the development of new instrumentation, along with new and improved measurement procedures for studying naturally occurring isotopic abundance variations in natural and technical samples, the number of internationally distributed, secondary isotopic reference materials with a specified delta value has blossomed in the last six decades to more than 150 materials. More than half of these isotopic reference materials were produced for isotope-delta measurements of seven elements: H, Li, B, C, N, O, and S. The number of isotopic reference materials for other, heavier elements has grown considerably over the last decade. Nevertheless, even primary international measurement standards for isotope-delta measurements are still needed for some elements, including Mg, Fe, Te, Sb, Mo, and Ge. It is recommended that authors publish the delta values of internationally distributed, secondary isotopic reference materials that were used for anchoring their measurement results to the respective primary stable isotope scale.

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“…Over the past few years advances have been made with the MC-ICP-MS technique with a long term external reproducibility of 0.2-0.4 ‰ Siebert et al 2006a). Even better reproducibility has been performed by Luais (2012).…”

Section: Germaniummentioning

confidence: 99%

Isotope Fractionation Processes of Selected Elements

Hoefs

2015

Stable Isotope Geochemistry

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Germanium isotope measurements of high-temperature geothermal fluids using double-spike hydride generation MC-ICP-MS

Cited by 41 publications

References 46 publications

A practical guide for the design and implementation of the double-spike technique for precise determination of molybdenum isotope compositions of environmental samples

A practical guide for the design and implementation of the double-spike technique for precise determination of molybdenum isotope compositions of environmental samples

Assessment of international reference materials for isotope-ratio analysis (IUPAC Technical Report)

Isotope Fractionation Processes of Selected Elements

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