Objective To determine the quality of broad hawthorn from different origins and provide a basis for scientifically formulating quality standards for hawthorn medicinal materials. Method According to the General Principles of the Four Parts of the 2015 edition of the Chinese Pharmacopoeia, microscopic and thin-layer chromatography identification was performed on hawthorn from different origins; Detect moisture and ash extracts. Result There are certain differences in the quality of hawthorn from different regions. Conclusion The microscopic and thin-layer identification of hawthorn and the detection of its indicator components can serve as a standard for controlling the quality of hawthorn medicinal materials.

Metrology is an important engineering discipline that covers the knowledge and technologies in such aspects as measurement, standardization, calibration and quality control. Nowadays, metrology management has become critical in industrial and scientific research fields for it helps ensure the accuracy, traceability and repeatability of products and data. The objective of this paper is to explore the basic principles of metrology management and introduce the software tools widely used in this field, so as to help Metrology Engineers better manage measurement and quality control processes.

In the current era of science and technology, chemical laboratory has become an indispensable part of scientific research and industrial production. The laboratory is not only the frontier to promote scientific discovery and technological innovation, but also an important place to cultivate future scientists. Laboratory safety is the priority of laboratory management, with the new situation of the chemical experiment increasingly diversified, chemical laboratory safety faces many new problems, this paper from the research and practice of the chemical laboratory safety management system, expounds the new situation of the chemical laboratory safety management system problems and countermeasures.

Objective This article aims to explore in detail the problems faced by medical laboratory laboratories in universities in terms of biosafety protection, and propose effective response strategies. Through in-depth analysis of laboratory equipment and facilities, personnel training, safety procedures and protocols, emergency response, and safety culture, this article aims to improve the safety performance of the laboratory. Method By evaluating the existing safety measures of medical laboratory in universities, identify key safety hazards. Emphasis has been placed on the modernization needs of equipment and facilities, personnel safety awareness and skill training, the development and implementation of strict safety procedures and protocols, and the establishment of effective emergency response mechanisms. Result In response to the identification issues, this article proposes a series of comprehensive solutions, including but not limited to updating laboratory equipment, strengthening personnel training, developing strict safety procedures, establishing sound emergency response mechanisms, and actively cultivating safety awareness within the laboratory. These solutions aim to improve the overall biosafety level of the laboratory, ensuring the safety and efficiency of research work. Conclusion It emphasizes the importance of continuously monitoring and updating laboratory safety measures. By implementing these strategies, not only can current security issues be addressed, but also new challenges that may arise in the future can be prepared to ensure a safe, efficient, and productive experimental environment.

Objective Discussion on the dilution of sulfur dioxide blank solution for determination of high-concentration sulfur dioxide samples. Methods Several experiments are done to Sulfur dioxide standard solution as sample. For the high concentration of sulfur dioxide exceeds the upper limit of the standard curve of absorbance (referred to as the out of sample, the same below), diluted with sulfur dioxide reagent blank solution (referred to as the blank solution, the same below) and then determination. Results The experimental results show that the absorbance of the sample, preferably not more than the upper limit of the standard curve is 0.100. Conclusion The dilution ratio should not be greater than 2 times; shake well placed 4-5 minutes after the determination as well; sulfur dioxide dilution and measured were lower than sulfur dioxide due to overloading, the samples should be more than the maximum absorbance value according to appropriately increase the sample number measured 4%-8%, make the results more close to the actual value.

Aspirin is a commonly used drug in clinical practice, which is well-known to the public for its precise therapeutic effect and minimal adverse drug reactions. Based on the research results of aspirin content determination methods in recent years, this paper introduces the research progress of titration, ultraviolet and visible spectrophotometry, high performance liquid chromatography, near infrared diffuse reflectance method, etc. in determining aspirin content, providing a reference basis for further developing new detection methods for aspirin.

Gas chromatography technology is an important analytical method in the detection of pesticide residues in food. It provides reliable technical support for food safety by separating and detecting pesticide components in samples. However, the technology faces challenges during its application, such as complex sample pretreatment, insufficient detection sensitivity and selectivity, and poor accuracy and reproducibility of results. To address these issues, this paper describes the application and optimization strategies of gas chromatography technology in the inspection of pesticide residues in food. These include optimizing sample pretreatment methods to improve detection efficiency, technological improvements to enhance detection sensitivity and selectivity, and quality control measures to ensure the accuracy and reproducibility of test results. Through these optimization strategies, the application effect of gas chromatography technology in the detection of pesticide residues in food can be significantly improved, providing stronger technical support for ensuring food safety.

Objective In response to the low accuracy of online detection of total sulfur content in natural gas, a research on online detection method based on gas chromatography-mass spectrometry (GC-MS) technology is carried out. Methods By designing an efficient online sampling method, continuous and stable collection of natural gas samples is achieved, ensuring the representativeness of the tested samples. At the same time, combining the high-resolution and strong qualitative capabilities of GC-MS, detection and analysis conditions for total sulfur content in natural gas are set, and corresponding result calculation algorithms are developed to ensure the accuracy and reliability of the detection results. Results The comparative experiments show that the detection results of the samples tested by the proposed method are highly consistent with the actual total sulfur content, and the deviation is very small. The specific numerical deviation is within$\pm {0.2}\mathrm{{mg}}/{\mathrm{m}}^{3}$, which is significantly smaller than that of the comparison method. Conclusion This method can not only accurately and quickly determine the total sulfur content in natural gas, but also significantly improve the detection accuracy compared with the existing methods, which can effectively meet the strict requirements of natural gas quality monitoring and environmental protection, and provide strong technical support for the online monitoring of total sulfur content in natural gas industry.

Objective This study aims to explore the application of gel permeation chromatography in determining the content of xylene-soluble substances in polypropylene. Methods The study employed gel chromatography to accurately measure the content of xylene-soluble substances in polypropylene and conducted a comparative analysis with the volumetric method to verify the accuracy and reliability of gel chromatography. Results The experimental results indicated that the absolute difference between the measurement results obtained by gel chromatography and the volumetric method did not exceed 0.07%, meeting the accuracy requirements. Furthermore, gel chromatography significantly shortened the analysis time from approximately 8 hours with the volumetric method to 3 hours, and the operation was more straightforward. The amount of xylene used during sample processing was greatly reduced, demonstrating its efficiency and environmental friendliness. Conclusion This study successfully validated the feasibility and superiority of gel chromatography in determining the content of xylene-soluble substances in polypropylene. This method is not only simple to operate and fast in analysis but also highly environmentally friendly, with minimal impact on the environment and operators. It provides strong support for the rapid detection and control of polypropylene product quality and holds broad industrial application prospects.

This paper summarizes the application status of ICP-MS technology in the detection of trace heavy metals in water bodies. The main problems of complex matrix interference, polyatomic ion interference, memory effect and insufficient mass resolution are analyzed, and the optimization countermeasures of optimizing the working parameters of collision reaction pool, adopting mathematical correction model, improving injection system and applying high resolution mass spectrometry are proposed. The research shows that, through system optimization and technical innovation, it is expected to improve the application efficiency of ICP-MS in water trace heavy metal detection, and provide reliable technical support for water environment quality monitoring.