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Re: Definition of VOC

M0FLEI01@ulkyvm.louisville.edu wrote:
> Is there a federal definition of a VOC and if so what is the definition? Is it
> based on vapor pressure?
> Thanks
> Marvin Fleischman, Industrial Assessment Center, Department of
> Chemical Engineering, University of Louisville, Louisville, KY
> 40292, 502/852-6357, FAX:502/852-6355, email:m0flei01@ulkyvm.
> louisville.edu

I should have included the following reference to 40 CFR 51.100 in my

  1.  The authority citation for part 51 continues to read as follows:
  Authority:  42 U.S.C. 7401-7671q
  2.  Section 51.100 is amended by revising paragraph (s) introductory
test and paragraph (s)(1) to read as follows:
  51.100  Definitions
*   *   *   *   *   
  (s) "Volatile organic compounds (VOC)" means any compound of carbon,
excluding carbon monoxide, carbon dioxide, carbonic acid, metallic
carbides or carbonates, and ammonium carbonate, which participates in
atmospheric photochemical reactions.  
  (1) This includes any such organic compound other than the following,
which have been determined to have negligible photochemical reactivity: 
methane; ethane; methylene chloride (dichloromethane);
1,1,1-trichloroethane (methyl chloroform);
1,1,2-trichloro-1,2,2-trifluoroethane (CFC- 113); trichlorofluoromethane
(CFC-11); dichlorodifluoromethane (CFC-12); chlorodifluoromethane
(HCFC-22); trifluoromethane (HFC-23); 1,2-dichloro 1,1,2,2-
tetrafluoroethane (CFC-114); chloropentafluoroethane (CFC- 115);
1,1,1-trifluoro 2,2-dichloroethane (HCFC-123); 1,1,1,2-tetrafluoroethane
(HFC-134a); 1,1-dichloro 1- fluoroethane (HCFC-141b); 1-chloro
1,1-difluoroethane (HCFC- 142b); 2-chloro-1,1,1,2-tetrafluoroethane
(HCFC-124); pentafluoroethane (HFC-125); 1,1,2,2-tetrafluoroethane (HFC-
134); 1,1,1-trifluoroethane (HFC-143a); 1,1-difluoroethane (HFC-152a);
parachlorobenzotrifluoride (PCBTF);  cyclic, branched, or linear
completely methylated siloxanes; acetone; perchloroethylene
(tetrachloroethylene); 3,3- dichloro-1,1,1,2,2-pentafluoropropane
(HCFC-225ca); 1,3- dichloro-1,1,2,2,3-pentafluoropropane (HCFC-225cb); 
1,1,1,2,3,4,4,5,5,5-decafluoropentane (HFC 43-10mee); difluoromethane
ethylfluoride (HFC-161);  1,1,1,3,3,3-hexafluoropropane (HFC-236fa); 
1,1,2,2,3-pentafluoropropane (HFC-245ca);
1,1,2,3,3-pentafluoropropane (HFC-245ea);
1,1,1,2,3-pentafluoropropane (HFC-245eb);
1,1,1,3,3-pentafluoropropane (HFC-245fa);
1,1,1,2,3,3-hexafluoropropane (HFC-236ea);
1,1,1,3,3-pentafluorobutane (HFC-365mfc);
chlorofluoromethane (HCFC-31);
1-chloro-1-fluoroethane (HCFC-151a);
1,2-dichloro-1,1,2-trifluoroethane (HCFC-123a);
1,1,1,2,2,3,3,4,4-nonafluoro-4-methoxy-butane (C4F9OCH3); 2-
((CF3)2CFCF2OCH3); 1-ethoxy-1,1,2,2,3,3,4,4,4- nonafluorobutane 
(C4F9OC2H5); 2-(ethoxydifluoromethyl)- 1,1,1,2,3,3,3-heptafluoropropane
((CF3)2CFCF2OC2H5); and perfluorocarbon compounds which fall into these

	(i) Cyclic, branched, or linear, completely fluorinated alkanes;
	(ii) Cyclic, branched, or linear, completely fluorinated ethers with no
	(iii) Cyclic, branched, or linear, completely fluorinated tertiary
amines with no unsaturations; and
	(iv) Sulfur containing perfluorocarbons with no unsaturations and with
sulfur bonds only to carbon and fluorine.
*   *   *   *   *   

Other key points to keep in mind when somebody asks any question about
VOCs are: (1) is this a regulatory question?, (2) is this an atmospheric
chemistry or health impact question?, and (3) what do they understand by
the term "VOC"?

Don Martz
Senior Scientist
Martz Science Consultants