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ORIGINAL ARTICLE. J. Chem. Metrol. 11:1 (2017) 9-15. Accurate determination of ethanol in water by qNMR: Validation and uncertainty assessment lker n* and Ahmet C Goren TUBITAK, UME, :54 41470 Gebze-Kocaeli, T rkiye (Received February 27, 2017; Revised March 23, 2017; Accepted March 25, 2017). Abstract: A rapid and simple method, having high reproducibility and low uncertainty for determination of low concentration of ethanol in water has been developed by using qNMR. Method validation was performed applying CRM and calibration solutions. The correlation coefficient for the analyte in the calibration interval was 1. At a concentration range of mg /g to 5 mg/g, the recovery was determined to be The relative uncertainties for ethanol solutions of mg/g and mg/g in water were found to be mg/g and mg/g, respectively.
Ün and Goren, J. Chem.Metrol.. 11:1 (2017) 9-15 13 Figure 2. Representative qNMR spectrum of ethanol in water sample solved in D 2 O 3.3. Traceability In quantitative NMR analyzes, the TSP-d
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