The injector’s role

• To introduce into the chromatograph a precise volume of sample for analysis without disturbing the flow of the gaseous mobile phase in the system.
• For non-volatile samples at room temperature, to vaporize them so that they are transported towards the separation column by the carrier gas.

The injector’s role

• To vaporize the sample.
• To introduce the volatile compounds into the separation column.

The injector’s role

• To prevent the distortion of chromatographic peaks by rapid injection and non-saturation of the stationary phase: division mode (split).

The injector’s role

• Very diluted sample in a solvent, no risk of column overloading: without division (splitless mode)
• Splitless mode in two stages:
  • Transfer of the sample to the column head with condensation of solvent
  • Solvent vaporization and initiation of analyte elution

Split/splitless injection?

Adapting the injection type to the sample, especially taking into account its concentration.