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  Early stationary phases of gas-solid chromatograph

  Aluminum oxide has 5 crystal forms, and g-type is commonly used in gas chromatography, it has good thermal stability and mechanical strength, and its adsorption capacity varies greatly depending on its water content, so it needs the activation treatment before using.

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  Carbon adsorbents—graphitized carbon black

  In order to overcome the shortcomings of activated carbon, many studies were conducted both domestically and internationally in the early stages. They subjected the carbon black to high-temperature treatment in vacuum or a reducing atmosphere, such as heating it to 3000 ℃. As a result, graphite like crystal shapes were formed on the carbon surface.

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  Early stationary phases of gas-solid chromatograph

  In the early development of gas chromatography, silica gel could be used as a stationary phase for gas-solid chromatography and as a carrier for gas-liquid chromatography. Because of differences in the production process, raw material surface area, and pore size of silicone, there are significant differences in its separation performance. For this reason, the manufacturer has carried out standardi

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