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Site Preparation

Gas requirements

Table 4. Gas Recommendations for Packed Columns

Gases for capillary columns

When used with capillary columns, GC detectors require a separate makeup gas

for optimum sensitivity. For each detector and carrier gas, there is a preferred

choice for makeup gas. Table 5 lists gas recommendations for capillary columns.

Detector Carrier gas Comments

Detector, anode purge,

or reference gas

Electron

Capture

Nitrogen Maximum sensitivity Nitrogen

Argon/Methane Maximum dynamic range Argon/Methane

Flame

Ionization

Nitrogen Maximum sensitivity Hydrogen and

air for detector

Helium Acceptable alternative

Flame

Photometric

Hydrogen H ydr oge n a nd a ir fo r d e te ct o r

Helium

Nitrogen

Argon

Nitrogen-

Phosphorus

Helium Optimum performance Hydrogen and

air for detector

Nitrogen Acceptable alternative

Thermal

Conductivity

Helium General use Reference must be same as

carrier

Hydrogen Maximum sensitivity (Note A)

Nitrogen Hydrogen detection (Note B)

Argon Maximum hydrogen sensitivity

(Note B)

Note A: Slightly greater sensitivity than helium. Incompatible with some compounds.

Note B: For analysis of hydrogen or helium. Greatly reduces sensitivity for other compounds.

Agilent Technologies 6890 Series Site Preparation And Installation Manual

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