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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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