Assessment of overall accuracy of lead isotope ratios determined by inductively coupled plasma mass spectrometry using batch quality control and the Youden two-sample method

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Abstract

The determination of lead isotope ratios in environmental samples using a batch quality control protocol is described. Isotope ratios are computed with respect to 204Pb and are corrected for mass discrimination by the addition of thallium to all solutions. The batch quality control protocol entails measurements of two separate control samples, namely National Institute of Standards and Technology (NIST) Standard Reference Material (SRM) 981 Common Lead and a galena sample independently analysed by thermal ionization mass spectrometry. The present study demonstrates results of these two control samples for 43 sample batches analysed over a two-year period of time. Modified Youden-type plots of the two-sample sums and differences are constructed in order to estimate over-all accuracy for individual batches and collectively for the entire dataset. This statistical treatment indicated that 95% of the batches have estimated over-all relative uncertainties for the ratios 206Pb:204Pb, 207Pb:204Pb and 208Pb:204Pb of less than 1.23, 1.45 and 1.77%, respectively.

Original languageEnglish (US)
Pages (from-to)1125-1129
Number of pages5
JournalJournal of Analytical Atomic Spectrometry
Volume7
Issue number7
StatePublished - 1992
Externally publishedYes

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Inductively coupled plasma mass spectrometry
Isotopes
Quality control
Thallium
Ionization
Mass spectrometry
Lead
lead sulfide
Uncertainty
Hot Temperature

Keywords

  • Batch quality control
  • Inductively coupled plasma mass spectrometry
  • Lead isotope ratio determination
  • Thallium-based mass discrimination correction
  • Youden two-sample protocol

ASJC Scopus subject areas

  • Spectroscopy

Cite this

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title = "Assessment of overall accuracy of lead isotope ratios determined by inductively coupled plasma mass spectrometry using batch quality control and the Youden two-sample method",
abstract = "The determination of lead isotope ratios in environmental samples using a batch quality control protocol is described. Isotope ratios are computed with respect to 204Pb and are corrected for mass discrimination by the addition of thallium to all solutions. The batch quality control protocol entails measurements of two separate control samples, namely National Institute of Standards and Technology (NIST) Standard Reference Material (SRM) 981 Common Lead and a galena sample independently analysed by thermal ionization mass spectrometry. The present study demonstrates results of these two control samples for 43 sample batches analysed over a two-year period of time. Modified Youden-type plots of the two-sample sums and differences are constructed in order to estimate over-all accuracy for individual batches and collectively for the entire dataset. This statistical treatment indicated that 95{\%} of the batches have estimated over-all relative uncertainties for the ratios 206Pb:204Pb, 207Pb:204Pb and 208Pb:204Pb of less than 1.23, 1.45 and 1.77{\%}, respectively.",
keywords = "Batch quality control, Inductively coupled plasma mass spectrometry, Lead isotope ratio determination, Thallium-based mass discrimination correction, Youden two-sample protocol",
author = "Ketterer, {Michael E}",
year = "1992",
language = "English (US)",
volume = "7",
pages = "1125--1129",
journal = "Journal of Analytical Atomic Spectrometry",
issn = "0267-9477",
publisher = "Royal Society of Chemistry",
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TY - JOUR

T1 - Assessment of overall accuracy of lead isotope ratios determined by inductively coupled plasma mass spectrometry using batch quality control and the Youden two-sample method

AU - Ketterer, Michael E

PY - 1992

Y1 - 1992

N2 - The determination of lead isotope ratios in environmental samples using a batch quality control protocol is described. Isotope ratios are computed with respect to 204Pb and are corrected for mass discrimination by the addition of thallium to all solutions. The batch quality control protocol entails measurements of two separate control samples, namely National Institute of Standards and Technology (NIST) Standard Reference Material (SRM) 981 Common Lead and a galena sample independently analysed by thermal ionization mass spectrometry. The present study demonstrates results of these two control samples for 43 sample batches analysed over a two-year period of time. Modified Youden-type plots of the two-sample sums and differences are constructed in order to estimate over-all accuracy for individual batches and collectively for the entire dataset. This statistical treatment indicated that 95% of the batches have estimated over-all relative uncertainties for the ratios 206Pb:204Pb, 207Pb:204Pb and 208Pb:204Pb of less than 1.23, 1.45 and 1.77%, respectively.

AB - The determination of lead isotope ratios in environmental samples using a batch quality control protocol is described. Isotope ratios are computed with respect to 204Pb and are corrected for mass discrimination by the addition of thallium to all solutions. The batch quality control protocol entails measurements of two separate control samples, namely National Institute of Standards and Technology (NIST) Standard Reference Material (SRM) 981 Common Lead and a galena sample independently analysed by thermal ionization mass spectrometry. The present study demonstrates results of these two control samples for 43 sample batches analysed over a two-year period of time. Modified Youden-type plots of the two-sample sums and differences are constructed in order to estimate over-all accuracy for individual batches and collectively for the entire dataset. This statistical treatment indicated that 95% of the batches have estimated over-all relative uncertainties for the ratios 206Pb:204Pb, 207Pb:204Pb and 208Pb:204Pb of less than 1.23, 1.45 and 1.77%, respectively.

KW - Batch quality control

KW - Inductively coupled plasma mass spectrometry

KW - Lead isotope ratio determination

KW - Thallium-based mass discrimination correction

KW - Youden two-sample protocol

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