On Verification, Calibration of Instruments, Certification of Methods and Reliability of the Results of Chemical Analytical Measurements

The main ways to achieve the reliability (unity) of measurement results, according to existing regulations, are mainly related to the verification of instruments, their calibration or reproduction of metrologically certified measurement methods. When it comes to measuring the amount of a substance, traditional approaches are not always optimal. So, for specific analyzers, a number of electrochemical devices, etc. verification is a completely justified and necessary element of obtaining reliable measurement results. When reproducing (or developing) methods implemented on universal devices, first of all, we should talk about constructing calibration characteristics (specific for each specific substance), observing sample preparation regimes, etc. In this case, the feasibility of verifying the device becomes at least questionable. Obtaining adequate results is largely influenced by the availability and use of appropriate calibration means: reference materials (pure substances or solutions), means of monitoring the obtained data –  matrix type RM, as well as certified measurement techniques. Thus, in the field of chemical- analytical measurements, there is a need to revise the list of instruments subject to mandatory verification, and at the same time, it is advisable to more actively develop the direction of work to significantly expand the list of reference materials, including matrix-type reference materials.