Open AccessAssessment and investigation of measurement uncertainty of standard samples of substances and materials in physicochemical measurements based on standard test methods
Author(s) -
Shodlik Masharipov,
Kakhramon R. Ruzmatov,
S A Rahmatullayev,
F F Fattoyev,
M. M. Mahmudjonov,
A G Isaqov
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2094/5/052011
Subject(s) - measurement uncertainty , standard uncertainty , traceability , certified reference materials , metrology , sample (material) , calibration , standard deviation , standard solution , round robin test , certification , primary standard , process engineering , computer science , biochemical engineering , mathematics , statistics , chemistry , engineering , chromatography , detection limit , political science , law
The article assessed and investigated the uncertainty of measurements of standard samples of substances and materials in physicochemical measurements based on standard test methods. A general approach to estimating the sources of uncertainty of standard samples is described. Uncertainties from heterogeneity of standard sample material. uncertainty from instability of standard sample characteristic values. uncertainty from method of setting reference value are investigated. Purity of substances is the main parameter that needs to be paid attention to when studying their properties. This is all the more important when it comes to using a pure substance as some approximation to the prototype reference value. since only this unit of seven main units in the International System of Units (SI system) does not have its own standard. In this sense. an important scientific task is the comprehensive study of pure substances for their practical use as benchmarks for comparison in metrological works and analytical research. The main and very important part of the measurement traceability system are materials with certified (certified) content of components and defined uncertainties of these values (standard samples of the approved type). which require pure substances certified at a higher - reference level. i.e. comparison standards.