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Background Odors in Tedlar® Bags Used for CAFO Odor Sampling

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  034144,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13890) @2003
Authors:   David B. Parker, Marty B. Rhoades, Jacek Koziel, Jarett Spinhirne
Keywords:   Odor, CAFO, sampling, Tedlar®, feedyard, cattle, SPME

Tedlar film is manufactured in a wet solvent process and continues to emit organic compounds after manufacturing. Tedlar bags are used for odor sampling at concentrated animal feeding operations (CAFOs). Odor regulations for CAFOs vary widely, but maximum detection thresholds (DT) of 2 to 15 have been proposed downwind of feeding operations. Results at the WTAMU Olfactometry Laboratory have shown that both commercially available Tedlar bags and homemade Tedlar bags have a detectable background odor (DTs of 20 to 60 typical) even following standard protocols for purging. Purging the bags before sampling was not effective in reducing DTs to acceptable levels, as verified with SPME analysis. Heating the Tedlar bags for 24 hrs, when combined with purging immediately after heating and again prior to odor sampling, reduced background DTs to less than 12. This is an acceptable range for odor sampling at open lot beef cattle feedyards or any other locations where DTs are expected to be greater than sixteen.

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