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This post was last edited by zhoudingshengs on 2023-11-3 at 11:58. When using a gas chromatography-mass spectrometer, the application varies; the carrier of the mobile phase is usually a gas, and the injector consists of a sharp injection needle. As it passes through the chromatographic column, the viscosity is low due to the low flow rate of the carrier gas, resulting in good fluidity. In terms of the compounds to be analyzed, those with a mass of less than 1000, low boiling points, and good stability are suitable. In actual use of this product, it is affected by the evaporation of the sample, so it is essential to pay attention to certain characteristics of the sample. In laboratory analysis, liquid chromatography instruments are used for analyzing liquids that are difficult to vaporize or have poor stability; such analysis is a specialized type. However, fluorescence detectors or ultraviolet detectors are commonly used as detection devices. In practical use, this type of instrument is not restricted by issues such as sample volatility or poor thermal stability; its advantages become even more apparent during use. Therefore, it is better to use this equipment for analyzing compounds related to medicine or biology. In actual analysis, gas chromatography-mass spectrometers follow similar principles. However, it is also highly mature in the process of separation; moreover, separation analysis is not only efficient but also fast, and the analytical advantages of these two aspects are quite evident. Therefore, when the sample is an organic compound, this type of analytical instrument can be used to achieve better results. In specific analyses, liquid chromatography instruments are used for samples that are difficult to separate. It can still be completed easily, especially since the interactions in sample analysis can be analyzed readily even at low temperatures during separation. Particularly in terms of sample recovery, it serves not only as an analytical method but also as a way of extraction, achieving good results in many fields. Since this method can be widely used in many fields, such liquid chromatography instruments are even more widely applied. There are many differences between these two types of instruments in terms of their actual use. However, when analyzing samples, it is essential to understand the characteristics of those samples in order to choose the more suitable instrument for the analysis.