Study on calibration of direct mercury analyzer

Direct mercury analyzer can directly test samples without sample pre-treatment, which leads to the advantages of no reagent pollution, less sampling volume, high sensitivity, good precision, and low cost. Therefore, it is widely used to analyze mercury in food, drinking water, cosmetics, soil, etc. As the key equipment for analyzing mercury, the accuracy of a direct mercury analyzer is essential to ensure the accuracy and reliability of the test results of mercury, which has great significance for environmental monitoring and protection. This article developed a calibration method to evaluate the metrological characteristics of a direct mercury analyzer by studying its working principle. Multiple different types of direct mercury analyzers were selected for pre-testing, and national-certified reference materials were chosen as references. Critical parameters such as linear error, detection limit, and repeatability were selected as test items. The experimental results show that the method proposed and reference materials selected can effectively evaluate the metrological performance of the instrument, which is of great significance for the quality control and quantity traceability of direct mercury analyzers.