Gas Chromatograph Columns – Types & Selection

The GC column is the heart of chromatographic separation. Column selection directly affects resolution, response time, sensitivity, and long-term reliability of the analyzer.

GC Column Types – Overview

Process gas chromatographs mainly use packed columns and capillary (open tubular) columns. Their construction and behavior are fundamentally different.

Separation Behavior Inside Columns

Separation efficiency depends on surface area, flow velocity, and interaction between components and stationary phase.

Typical Applications

Key Points for Technicians

• Packed columns are rugged and tolerant to contamination.
• Capillary columns provide superior resolution but need clean samples.
• Column damage directly affects retention time and peak shape.
• Incorrect column selection leads to poor separation and frequent alarms.