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Sample
and Analysis for Formaldehyde Emissions from Stationary Sources in
the Mineral Wool and Wool Fiberglass Industries – USEPA Method
316 USEPA Method 316 is used for the determination of formaldehyde from stationary sources in the mineral wool and wool fiber glass industries. High purity water is used to collect the formaldehyde. The formaldehyde concentrations in the stack samples are determined using the modified pararosaniline method. Formaldehyde is detected as low as 8.8 x 10-10 lbs/cu ft (11.3 ppbv) or as high as 1.8 x 10-3 lbs/cu ft (23,000,000 ppbv), at standard conditions over a 1 hour sampling period, sampling approximately 30 cu ft. Gaseous and particulate pollutants are withdrawn isokinetically from an emission source and are collected in high purity water. Formaldehyde present in the emissions is highly soluble in high purity water. The high purity water containing formaldehyde is then analyzed using the modified pararosaniline method. Formaldehyde in the sample reacts with acidic pararosaniline, and the sodium sulfite, forming a purple chromophore. The intensity of the purple color, measured spectrophotometrically, provides an accurate and precise measure of the formaldehyde concentration in the sample. Sulfite and cyanide in solution interfere with the pararosaniline method. |
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Last Update: October 25, 2006