G A S E S (continued) SRM
Nitric Oxide in Nitrogen (Certified for NO)
2627a 2628a 2737 2738
Oxygen in Nitrogen (Certified for O2
2657a* 2658a* 2659a*
Propane in Air (Certified for CH4 1660a
(also certified for C3 1665b 1666b 1667b
1668b* 1669b 2764
2765 (also certified for C3 H8 ) Propane in Nitrogen (Certified for C3
2644a 2646a 2647a
Oxides of Nitrogen in Air (Certified for NO2 2660a*
) 100
*Available as a NIST Traceable Reference Material (NTRM); from commercial suppliers. A suppliers list is available on our website.
The gas NTRM program was established in 1992 in partnership with the U.S. EPA and specialty gas companies as a means for providing end users with the wide variety of certified gas stan- dards needed to implement the Emissions Trading Provision of the 1990 Clean Air Act.
H8 ) 250
1000 2500
H8 ) )
4 (methane) 1 (propane)
3
10 50
100 500 0.25 100
)
2 mol % 10 mol % 21 mol %
5 10
0.5 1.0
Nominal Amount of Substance Fraction (µmol/mol)
WWW.NIST.GOV/SRM PHONE: (301) 975-2200 FAX: (301) 948-3730 EMAIL:
SRMINFO@NIST.GOV
39
ENVIRONMENTAL
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