According to 40 CFR §68.115, the amount of any listed toxic substance present in a mixture at a concentration greater than 1% does not need to be included in a threshold quantity determination if it can be shown that the partial vapor pressure is less than 10 mm Hg.
Formaldehyde is not specifically listed with a concentration cutoff, but is listed with the qualifier "solution". Can the partial pressure exemption be applied to formaldehyde solutions?
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