In principle, any substance that has a small molecular mass and a certain volatility, does not decompose under vaporization or column temperature, or has a large molecular weight, but can be derivatized into a volatile compound by various treatments, and can also be subjected to gas chromatography analysis. Specifically, in the current commercial gas chromatograph, the general GC is suitable for the analysis group with a point of less than 350 ° C, and the high temperature GC can analyze the component of the Buddha point not exceeding 500 ° C. In the instrumental analysis method, the characteristics of simultaneous separation and detection analysis of chromatographic analysis have unique advantages compared with other instrumental analysis methods. Due to its particularly high separation efficiency, sample analysis of complex mixtures of multiple components, isomers and optical isomers as well as trace components is almost an indispensable analytical tool. With the continuous development of detection technology, sample processing technology and microelectronic technology, the GC detection limit has been extended from the initial 10-2 to 10-13 or even some analysis can reach the order of 10-15. However, the conventional detectors commonly used in gas chromatography are not able to give characteristic signals according to the composition of the components to be analyzed. The qualitative analysis by conventional GC is also limited. For such problems, a variety of instrumental analysis is required. Use together to prove. The instrumental analysis methods currently used for online combination are: GC/MS, GC/FIR, LC/MS, LC/NMR, and the like.
Different types of GC users have significant differences in analysis purposes and requirements. Therefore, the functions, performance, and operational characteristics of the same type of instrument are also very different. As a new customer, it is first positioned to belong to that level. One of the main factors is the purchase of a good instrument. We can roughly divide GC users into three categories:
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1. National research institutes and research institutes in universities and colleges: mainly used in life science science, new materials science, forensic science, military science, aerospace science, archaeological excavation research, agriculture, forestry, geological ocean, pharmacokinetic function and toxicology research Analytical testing methods. Such users have higher overall requirements.
2. National ministries, bureaus, head offices, key industries in the national economy, research institutes set up by large enterprises, analysis centers, testing centers, monitoring centers, etc.: Typical industries are: chemical industry, petroleum industry, metallurgical industry, energy ( Nuclear energy, coal) industry, semiconductor industry, machinery industry, pharmaceutical industry, light industry (food, household chemicals), commercial, construction, etc. What such users are more demanding is the accuracy and reliability of the results.
3. For the first-line analysis of customers such as: process control and quality assurance in the factory production process, quality supervision of import and export commodities, disease diagnosis, health and epidemic prevention, industrial hygiene investigation and evaluation, public security detection and evidence collection, military equipment related monitoring (military Environment such as: daodan launch site, submarine and other air quality monitoring), biological product analysis, environmental monitoring daily analysis, resource development site analysis (oil field, natural gas calorific value calculation), daily commodities (cosmetics, spice composition, glass, ceramics, paper industry) Etc.) Quality monitoring, quality control of decoration materials, teaching laboratories, etc. This type of user is more repetitive.
Beijing Zhongyi Yusheng Technology Co., Ltd.
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Professional chromatographs and accessories
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March 16, 2022
March 18, 2020
September 27, 2024
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