Evaluation of the Uncertainty of Sulfur Dioxide Content in Grape-Fermented Beverage determined by Acid-Base Titration Method
The goal of this study is to efficiently evaluate the uncertainty of sulfur dioxide content in grape-fermented beverage by acid-base titration and identify the key factors that affect its uncertainty.The sulfur dioxide content in grape-fermented beverage was first measured by acid-base titration,then the relevant mathematical model was established,and finally all uncertainty components were calculated and evaluated.The results showed that when the confidence level was 95%and the coverage factor(k)was 2,the content of sulfur dioxide in grape-fermented beverage was(39.1±0.4)mg/L.The uncertainty of the detection results mainly came from repeatability measurement and titration process of the sample,and the calibration and dilution process of the standard solution were also key factors affecting the uncertainty.
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