Gas And Reagent Purity - Agilent Technologies ALS Handbuch

7890 Series GC Site Preparation

Gas and Reagent Purity

Agilent recommends that carrier and detector gases be 99.9995% pure. See
Table
high quality traps to remove hydrocarbons, water, and oxygen.
Table 10
Carrier, collision, and reagent gas
requirements
Helium (carrier and collision)
Hydrogen (carrier and self-cleaning
ion source)
Nitrogen (collision)
Nitrogen (drying gas, nebulizer
pressure)
Methane reagent gas
Isobutane reagent gas
Ammonia reagent gas
Carbon dioxide reagent gas
1 Nitrogen for the collision cell requires a separate supply from the nitrogen used for the drying gas.
2 Purity specification is the minimum acceptable purity. Major contaminants can be water, oxygen,
3 Required reagent gas for installation and performance verification, external CI MS only. The 5975,
4 Optional reagent gases, CI mode only.
34
10. Air needs to be zero grade or better. Agilent also recommends using
Carrier, collision, and reagent gas purity
1
2
3
4
4
4
A separate pressure regulator is required. A high pressure bottle of nitrogen is recommended for
the collision cell gas supply.
or air. Drying gas and nebulizer pressure gas can be supplied by a nitrogen gas generator, house
nitrogen system, or liquid nitrogen dewar.
5977, 7000 GC/MS, 7200 Q-TOF MS, and 240 Ion Trap operate in an external CI mode.
Purity
99.9995%
99.9995%
99.999%
99.999%
99.999%
99.99%
99.9995%
99.995%
GC, GC/MS, and ALS Site Preparation Guide
Notes
Hydrocarbon free
SFC grade
Research grade
Research grade
Research or SFC grade
Instrument grade
Research or SFC grade
SFC grade