In EMC (Electromagnetic Compatibility) testing, radiation testing occupies an important position and has significant influence. Based on the requirements of relevant job positions in enterprises for EMC test engineers, we conducted two rounds of lectures to sort out, research, and think and analyze, and developed a small and economical radiation disturbance test training platform. On the one hand, it avoids the high cost of dark room construction and the shortage of space, and on the other hand, it fills the gap in radiation interference testing teaching and helps students prepare for entering enterprises, helping them better adapt to the needs of enterprise job positions. This paper aims to develop a small and economical radiation interference test training platform, mainly explaining the development process from two aspects of key equipment and system design and construction to meet the needs of teaching and research, and also has guiding value for actual engineering applications.

Objective To establish an ultra high performance liquid chromatography-triple quadrupole tandem mass spectrometry (UPLC-MS/MS) method for simultaneous determination of the characteristic components of Ophiopogon japonicus and Liriope spicata (Thunb.) Lour. var. prolifera Y. T. Ma saponins B and Liriope muscari (Decne.) Baily saponins C in Xuanmai Ganju granules. Methods Xuanmai Ganju Granules were extracted by methanol ultrasound and analyzed using OMNI Orca${\mathrm{C}}_{18}$chromatography column (${2.1}\mathrm{\;{mm}}\times {100}\mathrm{\;{mm}},{2.6\mu }\mathrm{m}$). The mobile phase was eluted using a gradient elution of${10}\mathrm{{mmol}}/\mathrm{L}$ammonium acetate solution and methanol. The column temperature was set to${40}^{\circ}\mathrm{C}$, and the injection amount was${1\mu }\mathrm{L}$. The contents of methyl ophiopogon flavanone$\mathrm{A}$and methyl ophiopogon flavanone$\mathrm{B}$in Ophiopogon japonicus, as well as saponin B in Liriope spicata (Thunb.) Lour. var. prolifera Y. T. Ma and saponin C in Liriope muscari (Decne.) Baily, using an electrospray ion source (ESI), a simultaneous scanning mode of positive and negative ions, and a multi reaction monitoring mode. Results Methyl ophiopogon flavanone A, methyl ophiopogon flavanone B, saponin B from Liriope spicata (Thunb.) Lour. var. prolifera Y. T. Ma, and saponin C from Liriope muscari (Decne.) Baily have good linear relationships within their respective ranges, with $r$ values greater than 0.996 and recovery rates ranging from 90.6% to 99.8%. Conclusion This method has the advantages of simple and fast pre-treatment, high sensitivity, and accurate and reliable results. It can be used to determine the feeding situation of Ophiopogon japonicus mixed with Liriope spicata (Thunb.) Lour. in commercially available Xuanmai Ganju Granules and provide legal basis for regulatory authorities.

Objective To study the determination of mercury and arsenic content in soil by microwave digestion/atomic fluorescence method. Methods In this study, microwave digestion was used as the pretreatment, by optimizing the digestion temperature, digestion solution dosage and other parameters, digested with aqua regia (a mixture of hydrochloric acid and nitric acid), and the contents of mercury and arsenic in the samples were determined by atomic fluorescence. Results The results showed that the correlation coefficients of the standard curves of mercury and arsenic were 0.9996 and 0.9999, and the detection limits of the method were 0.0011 mg/kg and${0.0096}\mathrm{{mg}}/\mathrm{{kg}}$, respectively. The relative standard deviation of parallel experiments was${1.3}\%\sim {8.7}\%$, all of which were within 10%. The recoveries were 91.2%~117.4% and 86.0%~98.0%, respectively. The measured values of the certified reference materials are all within the theoretical range. Conclusion By optimizing digestion temperature, digestion solution dosage and other parameters, the method is accurate, simple, reliable and has good practicability.

Objective To establish a titration method for evaluating the uncertainty in the determination of thiomersal content in adsorbed diphtheria, tetanus, and acellular pertussis combined vaccine, and to identify the sources of significant uncertainty, improve laboratory detection ability. Methods The titration method was established according to the first method of the General Rules 3115 in the 2020 edition of the Pharmacopoeia of the People’s Republic of China, a mathematical model was established, and the sources of uncertainty in the detection process were analyzed to synthesize the standard uncertainty and extended uncertainty. Results In the determination of thiomersal content, all influencing factors have a certain effect. After type A evaluation and type B evaluation, the extended uncertainty${U}_{\mathrm{{rel}}}= {4.72}\%\left({K = 2}\right)$was obtained. Conclusion After evaluating the uncertainty introduced by each factor, it was found that the factors introducing significant uncertainty are mainly the titration process of the test sample. It is suggested that the titration process in low-temperature and other conditions be considered in subsequent method improvements.

This article aims to study common technical issues in the monitoring of building energy-saving materials and propose quality monitoring and management measures. In the process of building energy-saving buildings, energy-saving materials play an indispensable core role, and their performance and quality directly determine the level of building energy-saving efficiency. The quality inspection of energy-saving building materials is a key link in evaluating the qualification of building energy-saving projects and needs to be taken seriously. On the basis of analyzing the importance of building energy-saving material testing, this article explores the common problems in current energy-saving material quality testing, and proposes targeted improvement plans and response strategies based on practical experience and relevant national regulations.

Objective To prepare cultivated soil standard material for agricultural soil testing process to ensure that the test process is closer to the actual test samples. Methods The candidate samples prepared by drying, crushing, grinding, mixing, packing, using the$F$test uniformity test, examined the long-term stability of the candidate in storage for more than 18 months and short-term stability of simulated transportation conditions, invited 10 long undertake the soil standard material value laboratory cooperation value, using a variety of test methods and the current advanced and reliable test methods, copper and nickel test, the sample with the average as the specified value, the final synthesis uncertainty. Results Developed by soil composition analysis standard material uniformity is good, for 18 months of stability monitoring, through the calculation evaluation for 5 years, the fixed value project comprehensive accurate, reasonable uncertainty assessment, the relative extension of copper uncertainty is${6.5}\%$, the relative uncertainty of total nickel is${6.7}\%$, better than similar concentration of other same grade of soil national standard material. Conclusion The standard material is widely used and can be used for soil composition analysis in agriculture, forestry, environment and geochemistry.

With the development of modern medicine, fluorescence immunochromatography plays an important role in the detection of pathogenic microorganisms because of its rapid, simple and high sensitivity. In this paper, the principle and application process of the technique are systematically described, including sample pretreatment, preparation of fluorescently labeled antibodies, assembly of immunochromatographic apparatus, detection reaction and result interpretation. The application examples of the technology in the detection of bacteria, viruses and fungi were introduced, and the advantages and challenges of the technology were analyzed. The results show that fluorescence immunochromatography provides an effective tool for rapid identification and monitoring of pathogenic microorganisms, and has a wide application prospect in clinical diagnosis and public health.

Food safety has always been one of the focus of social concern, and elemental analysis of food testing laboratory as an important means to ensure product safety, its quality control is crucial. This paper first introduces the key role of food laboratory element analysis in ensuring product safety and the main ways of food testing laboratory element analysis. Then, the paper focuses on the problems in quality control and puts forward a series of effective quality control strategies. It is hoped to provide useful guidance for the quality control of elemental analysis in food testing laboratories to ensure food safety and public health.

In the era of rapid development of information technology, more and more research and development enterprises are seeking innovative research and development models, learning advanced research and development concepts, and achieving the transformation of traditional research and development to digital research and development. This article took Xin'an Chemical Group as an example to share practical experience and introduce the research and development model based on integrated product development (IPD) as the concept, combined with the construction of product lifecycle management (PLM) scientific research information management system, to explore and achieve the process of enterprise digital transformation, improved enterprise research and development level, and enhanced core competitiveness, so as to provide reference for the development of related enterprises.

In the process of production and inspection of biological products, a large amount of relevant data will be generated, but there are problems such as low digital management and inconvenient work in the data processing process. This paper constructed a trend analysis system based on the characteristics of trend analysis in the quality control of biological products. Based on the research and development of laboratory information management system (LIMS) and FineReport (FR), the system integrated the relevant technologies of instrument data acquisition and inspection data cleaning, used the shewhart control chart to complete the collection, cleaning and summary of the detection data, and provided statistics, analysis and visual monitoring, alarm and other functions to improve the quality and efficiency of the trend analysis of biological products. The stability and variability in production and testing were tracked to provide reference for the scientific management of biological products.