| The requirements of method confirmation during the procedure of laboratory certification were discussed. Combining with the specialty of environmental monitoring laboratories, the specific procedure was proposed, to conduct the method confirmation of a new environmental monitoring parameter. And the issues often occurred in the process were discussed, which were found in the procedure of on site laboratory certification. The method confirmation should be conducted strictly with the standard methods and technical monitoring specifications, covering the complete monitoring process, especially sampling, blank test and determination of limit of detection. In the procedure of precision and accuracy testing, the following approaches were required to ensure the reliability of determination of the new parameter, such as using high, medium, and low concentrations of certified reference materials, standard addition, comparison test (method comparison, personnel comparison, and comparison between laboratories), and increasing repeat times of measurement. |
