[Code of Federal Regulations]
[Title 40, Volume 30]
[Revised as of July 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR1065.810]

[Page 674]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 1065_TEST PROCEDURES AND EQUIPMENT--Table of Contents
 
                 Subpart I_Testing With Oxygenated Fuels
 
Sec. 1065.810  Calculations.

    (a) THCE emissions. (1) Calculate THCE emissions as the sum of the 
mass of the nonoxygenated hydrocarbons in the exhaust and the carbon-
equivalent mass of each measured oxygenated species in the exhaust.
    (2) Calculate carbon-equivalent mass of each measured oxygenated 
species from the following equation:

 Carbon equivalent = 13.8756 x MOC/MWPC

Where:

MOC is the mass of the oxygenated compound in the exhaust, and MWPC is 
the molecular weight of compound per carbon atom of compound.

    (b) NMHCE emissions. Calculate NMHCE emissions as either:
    (1) The sum of the mass of the nonoxygenated nonmethane hydrocarbons 
in the exhaust and the carbon-equivalent mass of each measured 
oxygenated species in the exhaust.
    (2) THCE minus the mass of methane in the exhaust.
    (c) Sample calculation. (1) Assume the following emissions for a 
test: 40.00 grams of nonoxygenated hydrocarbons, 100.00 grams of 
ethanol, and 10.00 grams of acetaldehyde, and 1.00 gram of formaldehyde.
    (2) The carbon-equivalent of the masses of oxygenated compounds are:
    (i) 13.8756 x 100.00/(46.068/2) = 60.24 grams of ethanol.
    (ii) 13.8756 x 10.00/(44.052/2) = 6.30 grams of acetaldehyde.
    (iii) 13.8756 x 1.00/(30.026) = 0.46 grams of formaldehyde.
    (3) THCE = 40.00 + 60.24 + 6.30 + 0.46 = 107.00 grams per test.