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Inlets
Packed column analysis is frequently done when high efficiency separations are not
needed or when gases are analyzed by gas-solid chromatography. Purged packed inlets
are simple in both design and use. Few parameters need to be set, and all carrier gas
flow flushes through the inlet into the column in the standard configuration.
Purged Packed Inlet Practices and Rationales
Parameter Selection/Setting Rationale
Inlet temperature BP of solvent +50°C
BP of major solute(s)
Ensures flash vaporization
Use for neat samples
Insert type 1/8 in. stainless steel
1/4 in. stainless steel
530 µm
Use for stainless steel column
only
Inserts permit connection of
columns up to 1/4 in. OD
Liner Glass Use to lower activity
(replaceable)
Initial column temperature Temperature programming Sharpens peaks and reduces run
time
Column type 1/8 in. packed stainless
1/4 in. packed glass
530 µm
Will not break
Better for polar or labile
compounds
Carrier gas flow 10-40 mL/min
10-60 mL/min
Use with N
2
carrier gas
Use with He or H
2
carrier gas
Purged Packed Inlets
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