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.
Ultraviolet rays are constantly affecting human health, especially causing harm to the eyes. Therefore, anti ultraviolet glasses and lenses are of great significance for human health and safety. At present, there are simple and qualitative testing equipment for the UV protection performance of lenses, but their measurement accuracy and traceability have not been verified. Accurate and quantitative UV protection testing requires the use of high-precision grating spectrometers, making it impossible to conduct on-site testing. Therefore, this article presents a portable anti-UV detection system for eyeglass lens, integrating electronic components such as UV light sources, UV sensors, micro-controllers, and display screen. Experimental verification has shown that the system can meet the testing requirements of various lenses in the market.
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