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ESTIMATIONS OF AMMONIA AND HYDROGEN SULFIDE FLUXES FROM CATTLE FEEDLOT SURFACES IN TEXAS HIGH PLAINS
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Pp. 123-130 in Air Pollution from Agricultural Operations III, Proceedings of the 12-15 October 2003 Conference (Research Triangle Park, North Carolina USA), Publication Date 12 October 2003. 701P1403.(doi:10.13031/2013.15503)
Authors: B.-H. Baek, J. A. Koziel, J. D. Spinhirne, D. B. Parker, and N. A. Cole
Keywords: Ammonia, Air quality, Hydrogen sulfide, Dynamic flow through surface chamber, Flux, Continuous emissions monitoring, Area source, Open dirt cattle feedlots, Manure
A dynamic flow-through chamber system and continuous analyzers were used for on-site measurements of ammonia-nitrogen (NH3-N) and hydrogen sulfide-sulfur (H2S-S) fluxes from commercial feedlot surfaces in northwestern Texas during two week period in the summer of 2002. Ambient air and air inside chamber temperatures, and manure pack temperature were measured continuously. Manure pack moisture content, pH, and TKN were measured daily to characterize its correlation with NH3-N fluxes. The preliminary average NH3-N flux from the feedlot surface for the entire measurement period was 1,669 ± 1,212 NH3-N µg/m2/min (or 1,494 ± 1,083 NH3-N µg/m2/min without accounting for the losses due to adsorption to chamber walls). Preliminary mean H2S-S flux was estimated at approximately at 1.884 ± 1.497 H2S-S µg S/m2/min (1.683 ± 1.334 H2S-S µg S/m2/min excluding the loss due to adsorption). Manure pack temperature was found to have a weak (R2 = 0.492) logarithmic relationship with NH3-N flux (Log10 NH3-N flux (µg N/m2/min) = 0.1308 × Tsoil(oC) + 28.198). The TKN showed a weak (R2 = 0.472) positive linear correlation with NH3-N flux.
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