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Site Preparation
Gas considerations
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.
12
Gas Purity Recommendations
Carrier Gases and Capillary Makeup Gases
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
99.9995%
Best available
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