Why is the calibration so important?
•If you use a surrogate, you could get interference.
•Or their could be financial issues in some testing (Emissions Credits, State Title V emission fees per ton for VOCs )
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•Surrogates are NOT allowed where the money is involved for credit trading:
•Some Methods and testing, you have to use EPA protocol gases (Part 75 / Part 60)
•Some Methods you have to use certified Zero Gases (CFR 40 72.2)*
•* (A gas is not a zero gas unless it meets the definition)