E C O P H Y S I C S Gas Phase Titration
CLD 780 TR / July 2000 153
A3.3 Reagents
a) NO concentration standard. Gas cylinder standard containing 50 to
100 ppm NO in N
2
, with less than 1 ppm NO
2
. (Further details on the
calibration gas are given in section 1.3.1, Appendix F, 40 CFR Part
50).
b) Zero air. Air, free of contaminants which will cause a detectable res-
ponse on the NO/NO
x
/NO
2
analyzer or which might react with either
NO, O
2
or NO
2
in the gas phase titration. A procedure for generating
zero air is given in Reference 1.
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