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Ask the Expert Question-and-Answer Archive by Ron Joseph March, 2005 Definition of Exempt Solvents, (VOC) Q. Ron, Excellent presentation in Metal Finishing this month (Feb '05) re VOC. Could I ask (1) where do you look to find the "exempt" and "non-exempt" status of a solvent.....is there a good website? (2) did the EPA Method 24 use the test method of ASTM, i.e., 1 hour drying at 105°C, as a basis for "volatiles"? Do they still use this method at all? Thanks, and keep up the good work. A. Thanks for the compliment. 40 CFR Part 51.100(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: (2) For purposes of determining compliance with emissions limits, VOC will be measured by the test methods in the approved State implementation plan (SIP) or 40 CFR part 60, appendix A, as applicable. Where such a method also measures compounds with negligible photochemical reactivity, these negligibility-reactive compounds may be excluded as VOC if the amount of such compounds is accurately quantified, and such exclusion is approved by the enforcement authority."
Best Wishes, Ron Joseph
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