Abstract
A variety of wind tunnels and flux chambers have been used to measure fluxes of volatile organic compounds (VOC) and ammonia (NH3) at animal feeding operations (AFO). However, there has been little regard to the extreme variation and inaccuracy caused by inappropriate air velocity or sweep air flow rates. There is a need to standardize flux chamber and wind tunnel measurements. In this paper, we present results of evaporative and VOC flux measurements with the EPA flux chamber and a small wind tunnel. Emissions of gas-film controlled compounds like NH3 and VOC at AFOs are positively correlated with evaporation rates. We propose a simple methodology for standardization and comparison of different chamber types by measuring water evaporation using a mass balance approach. This same methodology holds promise for correcting field-measured chamber flux measurements resulting in more accurate emission estimates.
Published Version
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