OPTIMIZED PROCESS OF VERIFICATION OF MEASUREMENT METHODS TO IMPROVE THE ACCURACY OF CRUDE OIL AND CRUDE OIL PRODUCT QUALITY

Verification is the provision of objective evidence that a given object fully satisfies the established requirements. If we consider a measurement technique as an object, then verification is the process of confirming that the technique meets the requirements established for it, primarily the requirements for obtaining results from it of the required level of quality (in other words, providing reliable information). During the process of method verification, the user of an analytical method should apply several fundamental tenets of analytical chemistry as they relate to the development and implementation of test methods. It is important to make the distinction between the validation of a test method by a standards-developing organization and the implementation of that test method by a laboratory. Whether the test method was developed by a committee of experts or by one individual in a company laboratory, the laboratory shall implement the method in the laboratory and shall demonstrate that the method is being performed sufficiently well and that the results meet the goals for data quality. That is, they should ascertain that the measurement process provides sufficient levels of performance fit for the purpose of testing the materials at hand. It is advisable to determine and document performance characteristics of the method including repeatability precision, limit of detection, limit of quantification, and perhaps other parameters. The laboratory is advised to evaluate the method for bias and for susceptibility to introduction of bias (namely, ruggedness). Method validation is a process of demonstrating that the method meets the required performance capabilities. International standards such as ISO/IEC 17025, certifying bodies, and regulatory agencies require evidence that analytical methods can produce valid results. This applies to laboratories using published standard test methods, modified standard test methods, and in-house test methods. Keywords: verification of method, quality control, precision, certified reference material, calibration.