Can the content and peaks be measured in both the liquid phase and the gas phase? What’s the difference?
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Replace the product; use a kettle washed with a solvent, and test the solvent to see if it has been cleaned properly. Should it be done in the gas phase or the liquid phase? What do these two phases measure? I want to know! Thank you!
:(Search for gas chromatography and liquid chromatography on Baidu; once you understand their principles, you’ll see that they are primarily used to separate substances based on their molecular weights)
I think it’s better to use gas phase analysis; it has high sensitivity, a fast sample analysis speed, and its cost is also lower than that of liquid phase analysis!
I disagree with the answer above. The decision regarding whether to use gas-phase or liquid-phase testing should be based on the properties of the sample, rather than making arbitrary choices. It’s also incorrect to say that these two testing methods are used for separating substances based on their molecular weight. Gas-phase analysis is primarily used for volatile substances that are thermally stable, with boiling points generally not exceeding 500°C. At present, there are more types of substances that can be separated by liquid-phase methods, but in chemical manufacturing, gas-phase analysis is more efficient for certain substances, such as noble gases and naphtha components. If you have questions about analysis, you can ask them in the chemical analysis forum.
If the solvent can dissolve the original medium, it can be used as a liquid phase. Both gas chromatography and liquid chromatography are available; the choice depends on the properties and composition of the substance being analyzed, and different columns can be used accordingly.