Isotope ratio measurements by MC-ICPMS below 10 μL min−1 under continuous sample flow conditions. Exploring the limits with strontium

Paredes, Eduardo; Asfaha, Daniel Goitom; Quétel, Christophe R.

doi:10.1039/c2ja30209h

Cited by 11 publications

(13 citation statements)

References 19 publications

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“…(They propagate relative shifts of a result value as standard uncertainty of a unity factor). The approach was also adopted by Paredes et al who worked at very low sample flow rates and reported expanded uncertainties ( k = 2) between 0.007 and 0.07 % when propagating only repeatability, blank correction, and a component accounting for the difference between the observed and the certified n ( 87 Sr)/ n ( 86 Sr) [ 49 ].…”

Section: Resultsmentioning

confidence: 99%

“…Although the majority of publications of (Sr) isotope ratio data do not include statements about measurement uncertainty according to the GUM, several authors have presented uncertainty calculations for Sr isotopes using procedures (1) [ 17 , 18 , 46 – 49 ], (2) [ 50 – 53 ], and (3) [ 7 , 54 , 55 ]. Examples of uncertainty calculations for other isotope ratios include references [ 30 , 56 – 62 ] in which the authors apply (1), references [ 63 – 70 ] in which authors apply (2), and reference [ 71 ] in which authors use (3).…”

Section: Introductionmentioning

confidence: 99%

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Evaluation strategies and uncertainty calculation of isotope amount ratios measured by MC ICP-MS on the example of Sr

2015

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This paper critically reviews the state-of-the-art of isotope amount ratio measurements by solution-based multi-collector inductively coupled plasma mass spectrometry (MC ICP-MS) and presents guidelines for corresponding data reduction strategies and uncertainty assessments based on the example of n(87Sr)/n(86Sr) isotope ratios. This ratio shows variation attributable to natural radiogenic processes and mass-dependent fractionation. The applied calibration strategies can display these differences. In addition, a proper statement of uncertainty of measurement, including all relevant influence quantities, is a metrological prerequisite. A detailed instructive procedure for the calculation of combined uncertainties is presented for Sr isotope amount ratios using three different strategies of correction for instrumental isotopic fractionation (IIF): traditional internal correction, standard-sample bracketing, and a combination of both, using Zr as internal standard. Uncertainties are quantified by means of a Kragten spreadsheet approach, including the consideration of correlations between individual input parameters to the model equation. The resulting uncertainties are compared with uncertainties obtained from the partial derivatives approach and Monte Carlo propagation of distributions. We obtain relative expanded uncertainties (Urel; k = 2) of n(87Sr)/n(86Sr) of < 0.03 %, when normalization values are not propagated. A comprehensive propagation, including certified values and the internal normalization ratio in nature, increases relative expanded uncertainties by about factor two and the correction for IIF becomes the major contributor.Electronic supplementary materialThe online version of this article (doi:10.1007/s00216-015-9003-9) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation strategies and uncertainty calculation of isotope amount ratios measured by MC ICP-MS on the example of Sr

2015

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“…The temperature at which the hTISIS is operated is a relevant parameter, as has been previously observed for elemental 12,13,29,30 and isotopic analyses. [31][32][33] The hTISIS temperature was optimized for ethanol-water mixtures representative for actual bioethanol samples, i.e., with an ethanol content from 60 to 100% while using the X-type skimmer. The 208 Pb/ 206 Pb ratios obtained upon combined internal (NIST-Tl) and external (NIST-Pb in 75% ethanol) correction are shown in Figure 4 for the different temperatures studied: room temperature ( (Figure 4.e) and 250°C (Figure 4.f).…”

Section: Effect Of Htisis Temperature On the Mass Bias Correctionmentioning

confidence: 99%

“…The combination of an hTISIS and MC-ICP-MS has been previously used for carrying out studies in aqueous sample matrices, aiming at improving the sensitivity and/or at reducing the volume of sample required for the analysis. [31][32][33][34][35] However, its application to direct isotopic analysis of organic samples has not been investigated yet.…”

Section: Introductionmentioning

confidence: 99%

Direct lead isotopic analysis of bioethanol by means of multi-collector ICP-mass spectrometry with a total consumption sample introduction system

Sanchez

Bolea-Fernández

Costas‐Rodríguez

et al. 2018

J. Anal. At. Spectrom.

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“…Paredes et al investigated the performance of a TISIS coupled with MC-ICP-MS for the determination of Pb 14 and Sr 15,16 isotope ratios. Accurate data were obtained at a very low sample uptake rate (5-30 mL min À1 ) and at a total sample consumption of less than 0.3 mL of solution.…”

Section: Introductionmentioning

confidence: 99%

Lead isotopic analysis of Antarctic snow using multi-collector ICP-mass spectrometry

Bazzano

Latruwe

Grotti

et al. 2015

J. Anal. At. Spectrom.

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Reliable determination of Pb isotope ratios in Antarctic snow is challenging because of the low analyte concentration and the low volume of sample typically available. In this work, a combination of a total sample consumption introduction system (the torch-integrated sample introduction system, TISIS) with multi-collector ICP-mass spectrometry (MC-ICP-MS) was used for this purpose. With this instrumental setup, accurate and precise determination of Pb isotope ratios was possible at concentrations as low as 0.5 ng mL(-1), while using 0.2 mL of solution only (total amount of Pb: 100 pg). At 10 ng mL(-1), the repeatability for the Pb-207/Pb-206 ratio was 0.16 parts per thousand RSD. The concentration range was further extended downwards by using 100-fold analyte element preconcentration via freeze-drying of 20 g of snow. The Pb concentration in procedural blanks was 0.5 +/- 0.3 pg g(-1), enabling the determination of Pb isotope ratios in snow samples containing down to 5 pg g(-1) of Pb. After development and validation, the procedure was applied to snow samples collected at Dome C (East Antarctic Plateau) on a monthly basis during the 2006 and 2010 campaigns. The method developed was able to reveal a seasonal variation in the Pb isotope ratios occurring during 2006 and strong inter-annual variation between the two campaigns

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Isotope ratio measurements by MC-ICPMS below 10 μL min−1 under continuous sample flow conditions. Exploring the limits with strontium

Cited by 11 publications

References 19 publications

Evaluation strategies and uncertainty calculation of isotope amount ratios measured by MC ICP-MS on the example of Sr

Evaluation strategies and uncertainty calculation of isotope amount ratios measured by MC ICP-MS on the example of Sr

Direct lead isotopic analysis of bioethanol by means of multi-collector ICP-mass spectrometry with a total consumption sample introduction system

Lead isotopic analysis of Antarctic snow using multi-collector ICP-mass spectrometry

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