An uncertainty budget for the determination of the purity of glyphosate by quantitative nuclear magnetic resonance (QNMR) spectroscopy |
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| Authors: | Tareq Saed Al-Deen D Brynn Hibbert James M Hook Robert J Wells |
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| Institution: | (1) NMR Facility, University of New South Wales, NSW 2052 Sydney, Australia;(2) School of Chemical Sciences, University of New South Wales, NSW 2052 Sydney, Australia;(3) Bob Wells and Associates, 34 Merriwa Street, NSW 2072 Gordon , Australia |
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| 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. |
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| Keywords: | Uncertainty budget Measurement uncertainty Method validation Quantitative nuclear magnetic resonance (QNMR) Glyphosate Agrochemicals |
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