Assessment of Uncertainty in the Determination of Water Acidity by Titration with Acid-Base Indicators
In order to improve the accuracy of the results of acid-base indicator titration method for the determination of water acidity,various sources of uncertainty were analyzed,and their measurement uncertainties were calculated under the specified measurement conditions according to the CNAS-GL006:2019"Guidance on Quantifying Uncertainty in Chemical Analysis"and JJF 1059.1-2012"Evaluation and Expression of Uncertainty in Measurement"and the Revision Sheet No.1.The uncertainty in the purity of standards,pipettes,common glass instrument,titration process and repro-ducibility were evaluated.It was found that the uncertainty in the titration process and the uncertainty caused by repeated measurements were the main factors affecting the results.
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