Site Preparation
Gas considerations
12
Gas purity
Some gas suppliers furnish instrument or chromatographic purity
grades (the names vary with the supplier) specifically intended for
chromatographic use. Use these when available.
Carrier Gases and Capillary Makeup Gases
99.9995%
”
”
Best available
Helium
Nitrogen
Hydrogen
Argon/Methane
Note: For ECD use, gases must be 99.9995% pure.
Detector Support Gases
Hydrogen
Air (dry)
99.9995%
Best available
Gas Purity Recommendations
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