DOI: 10.18503/1995-2732-2026-24-1-123-132
Abstract
Relevance. The reliability and durability of equipment in the field of oil and gas engineering, which is of strategic importance for the Russian economy and the oil and gas industry, is determined by effective corrosion protection and the role of inhibitors. The effectiveness of inhibition, in turn, is largely determined by the accuracy of analytical control of the inhibitor concentration, which is carried out, in particular, by the photometric method. However, the reliability of the results is subject to measurement uncertainty caused by various factors. In accordance with GOST ISO/IEC 17025-2019, the assessment and accounting of uncertainty are mandatory for testing laboratories conducting analytical control. The relevance of this work lies in providing practical approaches to assessing uncertainty in the photometric determination of corrosion inhibitors to ensure compliance with regulatory requirements and improve the quality of analytical results. Objectives. The study is aimed at estimating the measurement uncertainty in the photometric determination of a corrosion inhibitor. Methods Applied. A modeling approach has been used to estimate the uncertainty. A mathematical measurement model has been developed, describing the relationship between the measured value and the input parameters. Values have been determined for each input value, and corresponding distribution laws have been assigned. Originality. The peculiarity of this work is the comprehensive analysis of the photometric determination procedure, which includes the identification of sources of uncertainty at all stages of measurement using the Ishikawa cause-and-effect diagram. Result. The uncertainty sources have been identified and quantified: type A based on observation statistics, and type B based on the assessment of the influence of individual factors. The relative standard uncertainties have been calculated for each measurement stage. An equation for calculating the relative total standard uncertainty has been generated. The relative extended uncertainty has been calculated. The uncertainty budget has been formed to systematize and visualize the results. Practical Relevance. The implementation of the study results into the practice of analytical control of inhibitors in the field of oil and gas engineering and the oil and gas industry will ensure compliance with the requirements of GOST ISO/IEC 17025-2019, increase the reliability of measurements, and provide their metrological justification.
Keywords
durability, corrosion, inhibition efficiency, analytical control, reliability of results, cause-and-effect diagram, uncertainty, uncertainty budget
For citation
Sharafieva R.R., Denisova Ya.V., Sopin V.F. Photometric Determination of a Corrosion Inhibitor: the Role of Measurement Uncertainty in Ensuring the Quality of Analytical Studies and Their Results. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2026, vol. 24, no. 1, pp. 123-132. https://doi.org/10.18503/1995-2732-2026-24-1-123-132
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