What device must be vaporized when using a chromatograph?

In gas chromatography, the sample must be in a vaporized state to allow for efficient separation and analysis. When utilizing a chromatograph, particularly in its gas form, the sample must transition from a liquid to a gas. This phase change is essential as the chromatograph relies on the movement of vaporized compounds through the column.

Once vaporized, the samples can interact with the stationary phase within the chromatograph, leading to the separation of different components based on their individual volatilities and affinities for the stationary phase. Solid samples typically require first being dissolved in a solvent or directly heated to vaporize them, while gases can directly enter the system without modification. Plasma, though it has its uses in various applications, is not directly involved in the operation of a chromatograph for analyzing substances.

Therefore, vaporizing the liquid sample is a critical step in ensuring accurate and effective analysis in chromatography.