Abstract
This paper considers the present-day approach to traceability of measurements in chemical analysis. Specific features of concentration as a physical quantity are discussed. It is shown that the traceability of concentration measurements is the main task of metrology applications in quantitative analysis. It is proved that there is no need for a special traceability chain for measuring the properties used to identify components. The differences in the requirements for the composition measurements of standard samples and of reference materials are discussed by analysing the role played by these materials in calibration processes and accuracy checks.
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