As an important component of the new energy vehicle field, fuel cell vehicles are powered by the process of hydrogen gas passing through fuel cells to generate electricity. The quality of hydrogen directly affects the efficiency and lifespan of fuel cells, therefore ensuring the high quality of hydrogen is crucial. This article comprehensively explores the relationship between fuel cell vehicles and hydrogen quality, existing hydrogen quality detection technologies and their limitations, and focuses on several new rapid detection technologies, including hydrogen sensor technology, spectral analysis technology, and mass spectrometry analysis technology, as well as their applications in hydrogen quality detection of fuel cell vehicles.

With the rapid development of technology, traditional building material testing methods face many challenges, such as low efficiency, high cost, and insufficient accuracy. Therefore, introducing intelligent technologies such as artificial intelligence, machine learning, and the Internet of Things has become a key way to improve the efficiency and accuracy of building material detection. Artificial intelligence algorithms can achieve intelligent recognition and evaluation of building materials through a large amount of data learning and training, thereby improving the accuracy and speed of detection. At the same time, the application of Internet of Things technology makes the process of building material testing more intelligent and automated, achieving real-time monitoring and data transmission. In addition, the application of machine learning algorithms has also provided new ideas and methods for building material detection, further improving the accuracy and reliability of detection through deep data analysis and pattern recognition. Therefore, applying intelligent technology to material testing in construction projects is expected to bring revolutionary changes to the construction industry.

Objective To establish a highly specific method for thedetermination of related substances in salbutamol sulfate injection. Methods HPLC was performed on a column packed with spherical end-cappedoctylsilyl silica gel (Hypersil BDS C8 ${4.6}\times {150}\mathrm{\;{mm}},{3\mu}\mathrm{m}$ ) at the flow rate of ${0.6}\mathrm{\;{mL}}/\mathrm{{min}}$ , thedetection wavelength of ${220}\mathrm{\;{nm}}$ and columntemperature of ${25}^{\circ }\mathrm{C}$ by gradientelution using ${3.45}\mathrm{\;g}/\mathrm{L}$ sodiumdihydrogen phosphate dihydrate solution (adjust to $\mathrm{{pH}}$ 3.0 with phosphoric acid)as mobile phase A, 10 volumes of methanol and 90 volumes of acetonitrileas mobile phase B. Results The chromatograph showed good specificity ofthe peaks of main components and 15 impurities, and the methodverification of 6 of the impurities showed good linear, repeatabilityand recovery. Conclusion The chromatographic peaks of the maincomponents in salbutamol can be completely separated from the 15impurities. The established method is highly specific, easy to operateand can be used for the inspection of related substances in salbutamolsulfate injection.

Objective To evaluate the application value ofhigh-performance liquid chromatography fluorescence detection method fordetermining nitrite in drinking water. Method Collect mineral water, tapwater, and source water as water samples, and use high-performanceliquid chromatography fluorescence detection method to determine.Analyze the detection advantages of this method and the stability ofnitrite derivative 2,3 naphthalene triazole in the water standard. Result The nitrite concentration detected in pure water was ${0.6\mu }\mathrm{g}/\mathrm{L}$ , with goodpeak shape and no impurity interference; The detection limit ofhigh-performance liquid chromatography fluorescence detection method is ${0.3\mu }\mathrm{g}/\mathrm{L}$ , andthe quantitative limit is $1\mathrm{{\mug}}/\mathrm{L}$ ; After derivatization with nitrite, thestability of the derivative is high, and the measurement error is smallwithin 7 days; The recovery rate of nitrite spiking is between90.29%-102.60%, and the precision is between 0.71%-3.66%. Conclusion Thedetermination of nitrite in drinking water by high-performance liquidchromatography fluorescence detection method has the characteristics ofaccuracy and convenience, providing important technical support fordrinking water safety monitoring.

Objective To optimize the detection method and explore thedetection method with stable strength data and small relative standarddeviation of Curdlan. Method Using Curdlan as the material, compare theglue making methods, optimize the sampling amount, heating temperature,ice water bath cooling time, and parallel measurement times based onsingle factor experiments, and analyze the optimal combination of eachfactor condition through orthogonal experiments. Result The determineddetection method is to take a sample of ${0.30}- {0.31}\mathrm{\;g}$ , add ${15}\mathrm{\;{mL}}$ of freshly prepareddegassed water, stir with a trace sampling spoon to evenly disperse thesuspension, heat in a boiling water bath and maintain its uniformity,heat in a water bath for 10 minutes, then remove and cool in an icewater bath for 50 minutes, and conduct three parallel experiments. Conclusion This method has a small relative standard deviation andstable data. The column heads with diameters of ${0.4}\mathrm{\;{cm}},{0.5}\mathrm{\;{cm}}$ and ${0.6}\mathrm{\;{cm}}$ forproducts with gel strength greater than ${600}\mathrm{\;g}\cdot {\mathrm{{cm}}}^{-2}$ can be used for determination.

Objective A method was developed for the simultaneous determination of calcium, boron and sodium in Bombyx batryticatus by Inductively coupled plasma mass spectrometry (ICP-MS). Methods Microwave Digestion was used as the pretreatment method. The contents of Ca, B and Na in 25 batches of Bombyx batryticatus were determined by ICP-MS and analyzed by multivariate statistics. Results The three elements had a good linear relationship (r>0.995), the recoveries were in the range of 80%~120%, the reproducibility RSD<5%, the reproducibility RSD<5% and the stability RSD<5% within 1 day. Conclusion the method is simple and accurate, and can be used for the quantitative study of three elements in Bombyx batryticatus. The results can provide reference for the quality control and origin study of Bombyx batryticatus.

Objective To establish a new liquid chromatographic methodfor caffeine content in milk tea, to detect the caffeine content ofinstant milk tea in the region, and to make recommendations on healtheffects. Methods The determination was carried out on a Waters highperformance liquid chromatography Symmetry C18 column $\left({{5\mu}\mathrm{m}\times {150}\mathrm{\;{mm}}\times {4.6}\mathrm{\;{mm}}}\right)$ ,the mobile phase was methanol-water $\left({{30}+ {70}}\right)$ at a flow rateof $1\mathrm{\;{mL}}/\mathrm{{min}}$ ,the detection wavelength of ${272}\mathrm{\;{nm}}$ , and the columntemperature was ${35}^{\circ }\mathrm{C}$ . Results Thecorrelation coefficient was $\mathrm{r}={0.9999}$ over the linear range of 1-30 μg/mL, the recoverieswere 97.2%-99.5%, and the method precision was ${0.54}\%$ . Conclusion The method adoptspotassiun ferrocyanide and zinc acetate precipitation centrifugation,which can rapidly extract the effective components of caffeine in milktea and remove the interference of proteins, shorten the pretreatmenttime, optimize the chromatographic conditions, and accelerate thedetection of caffeine.

Given the potential adverse effects of alcohol ether estercompounds in the air on the environment and public health, this studyaims to develop an accurate method for monitoring these compounds. Byanalyzing experimental data, this study selected suitable measurementmethods and instrument reagents, and established a detailed measurementprocess. The research results show that the optimized carbon disulfidedesorption gas chromatography method performs excellently in thequantitative analysis of alcohol ether esters, with a linearrelationship of over ${99.9}\%$ and adetection limit as low as ${0.02}\mathrm{{mg}}/\mathrm{L}$ . Inaddition, the relative standard deviation of this method in precisionand recovery tests is less than 5%, fully demonstrating its highreliability and application value in environmental monitoring.

Objective To establish an HPLC method for the simultaneousdetermination of 12 common bacteriostatic agents (benzoic acid, benzylalcohol, sorbic acid, methylparaben, thimerosal, ethylparaben,chlorhexidine acetate, propyl hydroxybenzoate, butyl p-hydroxybenzoate,benzalkonium bromide, domiphen bromide, benzalkonium chloride ) inbrimonidine tartrate eye drops. The 48 batches of samples collected from4 domestic manufacturers were tested and evaluated. Methods ShiseidoCAPCELL PAK C18 MGII column ( ${4.6}\mathrm{\;{mm}}\times {250}\mathrm{\;{mm}},{5\mu}\mathrm{m}$ ) was used, ${0.02}\mathrm{\;{mol}}/\mathrm{L}$ ammonium acetate(pH adjusted to 4.5 by glacial acetic acid)(mobile phaseA) and methyl alcohol(mobile phase B) were used for gradient elution,and the detection wavelength was ${262}\mathrm{\;{nm}}$ . Results Theseparation degree of 12 bacteriostatic agents reached the requirements,and the blank excipients did not interfere with the determination ofbacteriostatic agents, the linear relationship of bacteriostatic agentsin their linear range was good, the average recoveries were in the rangeof 92.8% to 105.7% and the RSDs were ${0.3}\%\sim {1.9}\%\left({\mathrm{n}=9}\right)$ . The qualitative analysis showed that the types ofbacterial inhibitors in 48 batches were all in agreement with theformulation. The quantitative determination showed that the contents ofbacterial inhibitors were between ${24}\%\sim {102}\%$ of the formulation. Conclusion The method is sensitive, rapid and specific, and can be usedfor the accurate quantitative determination of multiple bacteriostaticagents in brimonidine tartrate eye drops. This study can providetechnical support for the standardized use of bacteriostatic agents inthis variety.

Objective A method for the determination of fluoride ion incoalmine water was established by ion chromatography. Methods The watersamples were determined by ${0.22\mu}\mathrm{m}$ qeuosystem filter membrane with a volume of ${25\mu }\mathrm{L}$ . In ion chromatograpy,the determination of fluoride was completed within $4\mathrm{\;{min}}$ under the anionexchange chromatography of HS-5A-P3 with column temperature at ${35}^{\circ }\mathrm{C}$ , eluted with ${20}\mathrm{{mmol}}/\mathrm{L}\mathrm{{KOH}}$ solution at the rate of ${1.0}\mathrm{\;{mL}}/\mathrm{{min}}$ . Results The linear relation between peak area and concentration offluoride were good. The linear return equation was $\mathrm{y}= {30.26}\mathrm{x}- {0.104}$ .The correlation coefficient of the standard curve was above 0.9997 . Thedetection limit was ${0.002}\mathrm{{mg}}/\mathrm{L}$ . Therecovery of fluoride was ${88.0}\%$ -115.5%. The mean value offluorine ion content in the standard sample was within the range of itsguaranteed concentration. Conclusion Compared fluoride ion selectiveelectrode method, the method has the advantages of small sample amountand can be used to determine other components simultaneously. It issuitable for the determination of fluorine ion content in largequantities of coal mine water.