Evaluation of Uncertainty for Determination of Industrial Methyl Orange-xylene Cyanol Indicator Titration of Triethanolamine Uncertainty

Based on the evaluation principles and methods of measurement uncertainty,this article used an example of titration to determine the content of industrial triethanolamine,analyzed the source of uncertainty,and determined the mathematical model of uncertainty.Various factors that affected the uncertainty of the measured value of industrial triethanolamine content are discussed,and the relative standard uncertainty components,synthetic standard uncertainties and expanded uncertainties were calculated.The results showed that the uncertainty of the determination of triethanolamine by titration mainly came from repeated operations of personnel and calibration of the instrument.