Where Do I Go to Get References to Title III Hazardous Air Pollutants (HAPs), Their Boiling Points and Vapor Pressure?

During the presentation on Defining Hazardous Air Pollutants (HAPs), we discussed the methodology EPA uses to define the Clean Air Act Amendments of 1990, Title III, HAPs by boiling point (BP) and vapor pressure (vp).  EPA uses eight categories to define HAPs according to vapor pressure:

  • Very Volatile Organic Compounds [VVOC] (vp> 380 mm Hg)
  • Very Volatile Inorganic Compounds [VVINC] (vp> 380 mm Hg)
  • Volatile Organic Compounds [VOC] (vp 0.1 to 380 mm Hg)
  • Volatile Inorganics [VINC] (vp 0.1 to 380 mm Hg)
  • Semi-volatile Organics [SVOC] (vp 10-1 to 10-7 mm Hg)
  • Semi-volatile Inorganics [SVINC] (vp 10-1 to 10-7 mm Hg)
  • Non-volatile Organics [NVOC] (vp < 10-7 mm Hg)
  • Non-volatile Inorganics [NVINC] (vp < 10-7 mm Hg)

Using boiling points, the EPA defines HAPs by three broad categories:

  • Volatiles (VVOC/VVINC/VOC/VINC)    BP < 100 C
  • Semi-volatiles (SVOC/SVINC)                 BP  100 to 300 C
  • Particles (NVOC/NVINC)                        BP  > 300 C

As you recall, we use this information to help us pick the proper sampling train to capture our analytes.  Particles would use a filtration technique, semi-volatiles would use both filtration and adsorbent, and volatiles would a combination of adsorbents in the sample train.

You were provided a copy of the paper written by Larry Johnson and myself that included the listing of the CAAA of 1990 Title III HAPs and appropriate sampling methods from EPA’s SW-846 Compendium for each of the listed HAPs.

Based upon that presentation, I have had many inquiries as to the availability of documents that list the BP and vp for the Title III HAPs.  EPA has funded three documents which have as part of them BP and vp for the Title III HAPs.  They are:

  • Ambient Measurement Methods and Properties of the 189 Clean Air Act Hazardous Air Pollutants (HAPs), EPA-600/R-94/187, October 1994. (EPA Project Officer:  Bill McClenny, 919-541-3158).
  • Simultaneous Control of PM-10 and Hazardous Air Pollutants II:  Rationale For Selection of Hazardous Air Pollutants as Potential Particulate Matter, EPA-452/R-93/013, October 1992 (EPA Project Officer:  Gary Blais, 919-541-3223).
  • Screening Methods for the Development of Air Toxics Emission Factors, EPA-450/4-91-021, September 1991 (EPA Project Officer:  Bill Kuykendal919-541-5372).

To obtain copies of these documents, you can order from EPA’s National Technical Information Service (NTIS), 5285 Port Royal Road, Springfield, VA, 22161, (703-487-4650, email:  Info@NTIS.FEDWORLD.GOV, Internet: https://www.ntis.gov.

In reality, I would call each of the EPA Project Officers and have them send you a copy.  Remember, you must be persistent in your demands for a copy!  Don’t take a brush-off or no for an answer!

In addition, you can go to the Internet and get chemical and physical properties (i.e., vapor pressures and boiling points) for many HAPs.  That site is:  https://chemfinder.camsoft.com