(a) THC determination and initial THC/CH4 contamination corrections. (1) If we require you to determine THC emissions, calculate xTHC[THC-FID]cor using the initial THC contamination concentration xTHC[THC-FID]init from Sec. 1065.520 as follows:[GRAPHIC] [TIFF OMITTED] TR15SE11.058 Example: xTHCuncor = 150.3 [micro]mol/molxTHCinit = 1.1 [micro]mol/molxTHCcor = 150.3--1.1xTHCcor = 149.2 [micro]mol/mol
(1) If we require you to determine THC emissions, calculate xTHC[THC-FID]cor using the initial THC contamination concentration xTHC[THC-FID]init from Sec. 1065.520 as follows:[GRAPHIC] [TIFF OMITTED] TR15SE11.058 Example: xTHCuncor = 150.3 [micro]mol/molxTHCinit = 1.1 [micro]mol/molxTHCcor = 150.3--1.1xTHCcor = 149.2 [micro]mol/mol
(2) For the NMHC determination described in paragraph (b) of this section, correct xTHC[THC-FID] for initial THC contamination using Equation 1065.660-1. You may correct xTHC[NMC-FID] for initial contamination of the CH4 sample train using Equation 1065.660-1, substituting in CH4 concentrations for THC.
(3) For the CH4 determination described in paragraph (c) of this section, you may correct xTHC[NMC-FID] for initial THC contamination of the CH4 sample train using Equation 1065.660-1, substituting in CH4 concentrations for THC.
(b) NMHC determination. Use one of the following to determine NMHC concentration, xNMHC:
(1) If you do not measure CH4, you may omit the calculation of NMHC concentrations and calculate the mass of NMHC as described in Sec. 1065.650(c)(5).
(2) For nonmethane cutters, calculate xNMHC using the nonmethane cutter's penetration fraction (PF) of CH4 and the response factor penetration fraction (RFPF) of C2H6 from Sec. 1065.365, the response factor (RF) of the THC FID to CH4 from Sec. 1065.360, the initial THC contamination and dry-to-wet corrected THC concentration xTHC[THC-FID]cor as determined in paragraph (a) of this section, and the dry-to-wet corrected CH4 concentration xTHC[NMC-FID]cor optionally corrected for initial THC contamination as determined in paragraph (a) of this section.
(i) Use the following equation for penetration fractions determined using an NMC configuration as outlined in Sec. 1065.365(d):[GRAPHIC] [TIFF OMITTED] TR15SE11.059 Where: xNMHC = concentration of NMHC.xTHC[THC-FID]cor = concentration of THC, initial THC
contamination and dry-to-wet corrected, as measured by the THC
FID during sampling while bypassing the NMC.xTHC[NMC-FID]cor = concentration of THC, initial THC
contamination (optional) and dry-to-wet corrected, as measured
by the NMC FID during sampling through the NMC.RFCH4[THC-FID] = response factor of THC FID to
CH4, according to Sec. 1065.360(d).RFPFC2H6[NMC-FID] = nonmethane cutter combined ethane
response factor and penetration fraction, according to Sec.
1065.365(d). Example: xTHC[THC-FID]cor = 150.3 [micro]mol/molxTHC[NMC-FID]cor = 20.5 [micro]mol/molRFPFC2H6[NMC-FID] = 0.019RFCH4[THC-FID] = 1.05[GRAPHIC] [TIFF OMITTED] TR15SE11.060 xNMHC = 131.4 [micro]mol/mol
(ii) For penetration fractions determined using an NMC configuration as outlined in section Sec. 1065.365(e), use the following equation:[GRAPHIC] [TIFF OMITTED] TR15SE11.061 Where: xNMHC = concentration of NMHC.xTHC[THC-FID]cor = concentration of THC, initial THC
contamination and dry-to-wet corrected, as measured by the THC
FID during sampling while bypassing the NMC. PFCH4[NMC-FID] = nonmethane cutter CH4 penetration
fraction, according to Sec. 1065.365(e).xTHC[NMC-FID]cor = concentration of THC, initial THC
contamination (optional) and dry-to-wet corrected, as measured
by the THC FID during sampling through the NMC.PFC2H6[NMC-FID] = nonmethane cutter ethane penetration
fraction, according to Sec. 1065.365(e). Example: xTHC[THC-FID]cor = 150.3 [micro]mol/molPFCH4[NMC-FID] = 0.990xTHC[NMC-FID]cor = 20.5 [micro]mol/molPFC2H6[NMC-FID] = 0.020[GRAPHIC] [TIFF OMITTED] TR15SE11.062 xNMHC = 132.3 [micro]mol/mol
(iii) For penetration fractions determined using an NMC configuration as outlined in section Sec. 1065.365(f), use the following equation:[GRAPHIC] [TIFF OMITTED] TR15SE11.063 Where: xNMHC = concentration of NMHC.xTHC[THC-FID]cor = concentration of THC, initial THC
contamination and dry-to-wet corrected, as measured by the THC
FID during sampling while bypassing the NMC.PFCH4[NMC-FID] = nonmethane cutter CH4 penetration
fraction, according to Sec. 1065.365(f).xTHC[NMC-FID]cor = concentration of THC, initial THC
contamination (optional) and dry-to-wet corrected, as measured
by the THC FID during sampling through the NMC.RFPFC2H6[NMC-FID] = nonmethane cutter CH4 combined
ethane response factor and penetration fraction, according to
Sec. 1065.365(f).RFCH4[THC-FID] = response factor of THC FID to
CH4, according to Sec. 1065.360(d). Example: xTHC[THC-FID]cor = 150.3 [micro]mol/molPFCH4[NMC-FID] = 0.990xTHC[NMC-FID]cor = 20.5 [micro]mol/molRFPFC2H6[NMC-FID] = 0.019RFCH4[THC-FID] = 0.980[GRAPHIC] [TIFF OMITTED] TR15SE11.067 xNMHC = 132.5 [micro]mol/mol
(3) For a GC-FID, calculate xNMHC using the THC analyzer's response factor (RF) for CH4, from Sec. 1065.360, and the initial THC contamination and dry-to-wet corrected THC concentration xTHC[THC-FID]cor as determined in paragraph (a) of this section as follows: [GRAPHIC] [TIFF OMITTED] TR15SE11.068 Where: xNMHC = concentration of NMHC.xTHC[THC-FID]cor = concentration of THC, initial THC
contamination and dry-to-wet corrected, as measured by the THC
FID.xCH4 = concentration of CH4, dry-to-wet corrected,
as measured by the GC-FID.RFCH4[THC-FID] = response factor of THC-FID to
CH4. Example: xTHC[THC-FID[cor = 145.6 [micro]mol/molRFCH4[THC-FID] = 0.970xCH4 = 18.9 [micro]mol/molxNMHC = 145.6-0.970 [middot] 18.9xNMHC = 127.3 [micro]mol/mol
(c) CH4 determination. Use one of the following methods to determine CH4 concentration, xCH4:
(1) For nonmethane cutters, calculate xCH4 using the nonmethane cutter's penetration fraction (PF) of CH4 and the response factor penetration fraction (RFPF) of C2H6 from Sec. 1065.365, the response factor (RF) of the THC FID to CH4 from Sec. 1065.360, the initial THC contamination and dry-to-wet corrected THC concentration xTHC[THC-FID]cor as determined in paragraph (a) of this section, and the dry-to-wet corrected CH4 concentration xTHC[NMC-FID]cor optionally corrected for initial THC contamination as determined in paragraph (a) of this section.
(i) Use the following equation for penetration fractions determined using an NMC configuration as outlined in Sec. 1065.365(d):[GRAPHIC] [TIFF OMITTED] TR15SE11.069 Where: xCH4 = concentration of CH4.xTHC[NMC-FID]cor = concentration of THC, initial THC
contamination (optional) and dry-to-wet corrected, as measured
by the NMC FID during sampling through the NMC.xTHC[THC-FID]cor = concentration of THC, initial THC
contamination and dry-to-wet corrected, as measured by the THC
FID during sampling while bypassing the NMC.RFPFC2H6[NMC-FID] = the combined ethane response factor and
penetration fraction of the nonmethane cutter, according to
Sec. 1065.365(d).RFCH4[THC-FID] = response factor of THC FID to
CH4, according to Sec. 1065.360(d). Example: xTHC[NMC-FID]cor = 10.4 [micro]mol/molxTHC[THC-FID]cor = 150.3 [micro]mol/molRFPFC2H6[NMC-FID] = 0.019RFCH4[THC-FID] = 1.05[GRAPHIC] [TIFF OMITTED] TR15SE11.070 xCH4 = 7.69 [micro]mol/mol
(ii) For penetration fractions determined using an NMC configuration as outlined in Sec. 1065.365(e), use the following equation:[GRAPHIC] [TIFF OMITTED] TR15SE11.071 Where: xCH4 = concentration of CH4.xTHC[NMC-FID]cor = concentration of THC, initial THC
contamination (optional) and dry-to-wet corrected, as measured
by the NMC FID during sampling through the NMC.xTHC[THC-FID]cor = concentration of THC, initial THC
contamination and dry-to-wet corrected, as measured by the THC
FID during sampling while bypassing the NMC.PFC2H6[NMC-FID] = nonmethane cutter ethane penetration
fraction, according to Sec. 1065.365(e).RFCH4[THC-FID] = response factor of THC FID to
CH4, according to Sec. 1065.360(d).PFCH4[NMC-FID] = nonmethane cutter CH4 penetration
fraction, according to Sec. 1065.365(e). Example: xTHC[NMC-FID]cor = 10.4 [micro]mol/molxTHC[THC-FID]cor = 150.3 [micro]mol/molPFC2H6[NMC-FID] = 0.020RFCH4[THC-FID] = 1.05PFCH4[NMC-FID] = 0.990[GRAPHIC] [TIFF OMITTED] TR15SE11.072 xCH4 = 7.25 [micro]mol/mol
(iii) For penetration fractions determined using an NMC configuration as outlined in Sec. 1065.365(f), use the following equation:[GRAPHIC] [TIFF OMITTED] TR15SE11.073 Where: xCH4 = concentration of CH4.xTHC[NMC-FID]cor = concentration of THC, initial THC
contamination (optional) and dry-to-wet corrected, as measured
by the NMC FID during sampling through the NMC.xTHC[THC-FID]cor = concentration of THC, initial THC
contamination and dry-to-wet corrected, as measured by the THC
FID during sampling while bypassing the NMC.RFPFC2H6[NMC-FID] = the combined ethane response factor and
penetration fraction of the nonmethane cutter, according to
Sec. 1065.365(f).PFCH4[NMC-FID] = nonmethane cutter CH4 penetration
fraction, according to Sec. 1065.365(f).RFCH4[THC-FID] = response factor of THC FID to
CH4, according to Sec. 1065.360(d). Example: xTHC[NMC-FID]cor = 10.4 [micro]mol/molxTHC[THC-FID]cor = 150.3 [micro]mol/molRFPFC2H6[NMC-FID] = 0.019 PFCH4[NMC-FID] = 0.990RFCH4[THC-FID] = 1.05[GRAPHIC] [TIFF OMITTED] TR15SE11.074 xCH4 = 7.78 [micro]mol/mol
(2) For a GC-FID, xCH4 is the actual dry-to-wet corrected CH4 concentration as measured by the analyzer. [76 FR 57462, Sept. 15, 2011]