Identification and analysis of sources of uncertainty when determining the mass fraction of protein in semi-finished meat pdroducts

Evaluation of measurement uncertainty in product quality control is a guarantor of confidence in the control results. The process of harmonization of domestic regulatory documents with international ones requires the determination of the measurement uncertainty in the control methods. In this regard, the search for a solution to the laborious and complex problem of introducing the concept of measurement uncertainty in control methods, including meat products, is an urgent task at the present time. The most important step in assessing measurement uncertainty is the analysis of sources of uncertainty. Based on a comprehensive study of the procedure for determining the mass fraction of protein, for the first time, sources of measurement uncertainty have been identified at all stages of the analysis using the Pareto cause-effect diagram. It was found that at all stages such components of uncertainty as the degree of purity of chemical glassware and cuvettes, temperature of solutions, balance calibration, calibration of volumetric chemical glassware, calibration of spectrophotometer wavelengths, readability, nonlinearity, sensitivity, repeatability during sampling, and measurement precision arise. The specified uncertainties in determining the mass fraction of protein affect the reliability of the results obtained.