Gas chromatography needle valveIt is a physical separation method. By utilizing the small differences in the distribution coefficients (solubility) of each component of the tested substance between different phases, when the two phases move relative to each other, these substances undergo repeated distribution between the two phases, resulting in significant differences in properties and separation of different components.

Gas chromatography needle valveFeatures:

1. High sensitivity: can detect 10-10 grams of substances, and can be used for trace impurity analysis of ultra pure gases and polymer monomers, as well as analysis of trace toxins in the air.

2. High selectivity: It can effectively separate various isomers and isotopes with extremely similar properties.

3. Can: Separate complex samples into individual components.

4. Fast speed: General analysis can be completed in just a few minutes, which is beneficial for guiding and controlling production.

5. Wide application range: It can analyze low content gases and liquids, as well as high content gases and liquids, without being limited by component content.

6. The required sample size is small: usually a few milliliters are used for gas samples, and a few microliters or tens of microliters are used for liquid samples.

7. The equipment and operation are relatively simple, and the instrument price is cheap.