Gas Chromatography
A retention gap is placed between the injector and the front of the column to

retain the sample and release it gradually to the column
retain contaminants and prevent them from reaching the column
prevent backflush of the injected solution
All of these

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Gas Chromatography
Sample injection is considered successful if

the sample is spread evenly along the column
all of the sample in the injector has been added to the column
the sample is homogenously spread along the column
the sample is concentrated at the start of the column

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