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Accreditation and Quality Assurance

, Volume 9, Issue 1–2, pp 55–63 | Cite as

An uncertainty budget for the determination of the purity of glyphosate by quantitative nuclear magnetic resonance (QNMR) spectroscopy

  • Tareq Saed Al-Deen
  • D. Brynn HibbertEmail author
  • James M. Hook
  • Robert J. Wells
Practitioner’s Report

Abstract

An uncertainty budget is presented for the results of measurements of purity of the agrochemical glyphosate using 1H and 31P quantitative nuclear magnetic resonance (QNMR) spectroscopy. The budget combines intralaboratory precision from repeated independent measurements of a batch, and other Type A and Type B effects. Consideration of correlation of uncertainties in ratios of mass determinations has been included. Expanded uncertainties of the purity for single determinations of purity by 1H and 31P QNMR are 0.66% and 0.82% (95% confidence interval, k=2), respectively.

Keywords

Uncertainty budget Measurement uncertainty Method validation Quantitative nuclear magnetic resonance (QNMR) Glyphosate Agrochemicals 

Notes

Acknowledgments

The authors acknowledge useful suggestions from Mr. G. O’Donnell of Workcover Australia.

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Tareq Saed Al-Deen
    • 2
  • D. Brynn Hibbert
    • 2
    Email author
  • James M. Hook
    • 1
  • Robert J. Wells
    • 3
  1. 1.NMR FacilityUniversity of New South WalesSydneyAustralia
  2. 2.School of Chemical SciencesUniversity of New South WalesSydneyAustralia
  3. 3.Bob Wells and AssociatesGordon Australia

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