Objective A method for simultaneous determination of MBAA, DBAA, DCAA, TCAA and ${\mathrm{{ClO}}}_{2}{}^{- }$ in drinking water was established by ion chromatography. Methods The water samples were determined by ${0.22\mu}\mathrm{m}$ qeuosystem filter membrane with a volume of ${500\mu }\mathrm{L}$ . The samples were rinsed with $\mathrm{{KOH}}$ solution gradient and separated by IonPac AS19 anion column. The column temperature was set at ${30}^{\circ }\mathrm{C}$ , and the current of the inhibitor was ${75}\mathrm{\;{mA}}$ . Results The results showed that the linearity ranges of ${\mathrm{{ClO}}}_{2}{}^{- }$ , MBAA, DBAA, DCAA and TCAA were found in the range of ${10}\sim {1000\mu}\mathrm{g}/\mathrm{L},\mathrm{r}> {0.9990}$ , with detection limits $\left({3\mathrm{\;S}/\mathrm{N}}\right)$ of ${0.32},{0.76},{1.30},{0.69},{1.58\mu}\mathrm{g}/\mathrm{L}$ . The standard recoveries were ${80}\%\sim {110}\%$ and RSD (n=6) of the determined values were all less than 5.0%. Conclusion The method was simple, sensitive, can meet the detection requirements of four kinds of Haloaeetic Acids and Chlorite in drinking water. The method can be used for the determination of kour kinds of haloaeetic acids and chlorite in drinking water.

Objective To develop an ultra high performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS) to identification of the feeding status of turtle and turtle shell components in different batches of Gejie Dingchuan Pills. Methods This study used the identification method of characteristic peptides of Animal medicine for reference, Enzymatic hydrolysis of different batches of Ge jie Ding chuan Pill samples using trypsin, and Identification by using the ultra high performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS). The characteristic ion pairs of Testudinis Carapax et Plastrum and Trionycis Carapax were as detection ion pairs. The positive electrospray ionization and multiple reaction monitoring were adopted. Result: 51 batches of Gejie Ding chuan Pills form 8 companies have all detected turtle shell components, but no other turtle source components have been detected. Conclusion This method is raliable for identification of Testudinis Carapax et Plastrum and Trionycis Carapax form Ge jie Ding chuan Pill.

Objective To build capability verification public service platform based on the proposed recommendation algorithm. Methods Using big data and artificial intelligence related technologies, after the preprocessing of the ability verification data over the years, the recommendation algorithm model of the supply and demand matching between the provider and the participant is established and trained. After the training meets the requirements, the recommendation accuracy of the algorithm is verified in the core business process of the ability verification. Further explore the needs of all parties in the field of capability verification, integrate the resources of all parties in the field of capability verification, and build a national public service platform for capability verification by using unified data specification, unified business process and unified business description method. Results By using this algorithm model, the supply and demand matching of the providers and participants in the capability verification service on the platform has a better fit than other platforms without using the algorithm. Conclusion The construction of the public service platform for capability verification based on recommendation algorithm

The application of the 7S concept in the construction of metrology laboratories and their standardized management can significantly enhance organizational effectiveness, guarantee experimental accuracy, enhance safety awareness, and through continuous improvement to achieve lasting job satisfaction and performance optimization, which is a necessary condition for the realization of high-efficiency, high-quality laboratory operations. This paper is aimed at measuring laboratory construction and standardized management of the 7S concept of the integration of strategies to carry out research, aims to explore the construction of measuring laboratories, standardized management of how to achieve the development of management programs based on the $7\mathrm{\;S}$ concept through case studies. Only in this paper, for China’s measurement laboratory construction units to learn and reference.

In the process of college education,it is necessary to use various facilities and tools,so many colleges and universities build special laboratories to provide environment and conditions for experimental teaching. Especially in the context of the rapid development of science and technology, schools pay more and more attention to experimental education and improve the quality of laboratory water. They have not only invested a large amount of construction funds, but also formulated more perfect laboratory management plans to promote the continuous improvement of laboratory management. But in the actual management, many colleges and universities still have some problems.Because the scale of laboratory assets has expanded,the number of instruments and equipment has increased, and the value has increased, the management difficulty has also increased, and there are higher requirements for management model innovation. This paper takes university teaching laboratory as the research object, expounds several common teaching laboratory management modes, analyzes the management system and operation mode of China's teaching laboratory, and puts forward the practical strategy of university teaching laboratory management mode.

With the continuous development of China's manufacturing industry and the increase in international trade, the requirements for product quality and safety are constantly increasing. Enterprises need to establish a modern and comprehensive laboratory to provide strong technical support for themselves and ensure the quality and international competitiveness of their products. Taking the laboratory construction of auto parts manufacturing enterprises as an example, this paper studied the process and method of industrial product testing laboratory construction, summarized the general process and method of laboratory construction, Including needs assessment and project planning, site selection and space design, equipment procurement and installation, personnel recruitment and training, quality management system establishment, laboratory safety and environmental protection, laboratory information and digitization, continuous improvement and technological innovation, etc., and put forward relevant suggestions to provide theoretical reference for the construction of related laboratories.

Food re-inspection refers to food production and operation of food safety supervision and sampling inspection conclusions have objections and in accordance with the law to the market supervision and management department to submit an application for re-inspection, market supervision and management department commissioned the re-inspection of the re-inspection of the backup samples for review and inspection of the behaviour.Re-inspection is an important way for food producers and operators to safeguard their legitimate rights and interests, an important link for market supervision departments to ensure the high quality of food safety supervision work, and an important measure to ensure the relatively fair and stable operation of the market. Because the retest conclusion serves as the final conclusion Therefore, the professionalism of the re-inspection institution is particularly important in the re-inspection work. Based on the perspective of the re-inspection institution, this paper analyzes the risk points of the food re-inspection acceptance work (i. e., contract review), so that the re-inspection institution can avoid potential risks and lay a solid foundation for the smooth progress of the whole re-inspection work.

ABSTRACT: Against the backdrop of accelerating the modernization process of the military, testing and evaluating the adaptability of equipment environment has become particularly important. However, the current equipment testing and appraisal work cannot meet the needs of equipment testing and evaluation under the new system, and it is urgent to systematically sort and analyze it. China has established a relatively complete experimental system, and has made significant progress in both hardware equipment construction and training of experimental personnel. In the evaluation test of single system weapons and equipment, its management and technology are also relatively mature and complete. However, there are new challenges in equipment testing. Therefore, this article proposes an overall approach for equipment environmental adaptability testing and verification under a new system of digital transformation in equipment testing and identification. It grasps the key links in the entire process of testing and identification, spans various stages, and combines virtual and real to comprehensively evaluate equipment.

Objective To trace the source of a foodborne disease outbreak caused by consuming smoked meat pancakes contaminated with Salmonella enteritidis. Methods Epidemiological investigations were carried out on 8 patients, samples of relevant environment, food and feces were collected, laboratory tests were carried out according to national standards. After bacteria enhancement, suspicious colonies were selected for biochemical identification, and the six strains of Salmonella detected underwent serum agglutination with standard diagnostic sera, drug sensitivity test and pulsed field gel electrophoresis. Result There were 8 cases of this incident, and out of the 6 samples, 6 strains of Salmonella enteritidis were isolated. The detection rates of Salmonella in the food, environmental samples, and cases feces were all 100%. The drug sensitivity test results showed that all strains were resistant to 6 drugs, and the drug resistance spectrum was CT-CTX - TET - CIP - AMP - AMS. They were sensitive to CHL, SXT, ETP, MEM, CAZ, CZA, TIG, AZM, and AMI. The PFGE bands of the 6 strains were consistent, with the homology of ${100}\%$ , and that showed the same clone. Conclusions This incident is a foodborne disease outbreak caused by consuming smoked meat pancakes contaminated with Salmonella enteritidis.

Objective The aim of this study is to investigate the variation of SERS effect intensity with the distance between probe molecules and the enhanced surface using atomic layer deposition (ALD) technology. Methods The study used ALD technology to deposit two-dimensional materials with different thicknesses on the surface of SERS to block raman probe molecules from the surface, exploring the weakening effect of different interaction distances on the SERS effect of the surface, and studying the changes in raman spectral intensity of probe molecules;the study used a silver-silicon combination as the SERS substrate, and a crystal violet aqueous solution with a concentration of ${10}^{-4}\mathrm{\;{mol}}/\mathrm{L}$ as a raman probe to conduct SERS effect exploration experiments on two-dimensional materials with different thicknesses. Results The final experimental results prove that the liquid SERS spectral intensity at the ${532}\mathrm{\;{nm}}$ laser wavelength generally weakens with the increase in the thickness of the two-dimensional material. Conclusion 5 nm thickness is its limiting distance.