Correlation of odor dilution threshold and H2S and NH 3 concentrations for animal feedlots

Huiqing Guo, Larry D. Jacobson, David R. Schmidt, Richard E. Nicolai

Research output: Contribution to conferencePaperpeer-review

6 Scopus citations


Odor quantification using an olfactometer and panelists is very expensive. Among the numerous components of odors from animal sources, hydrogen sulfide and ammonia are two important and easily measured gases that could possibly be used as odor indicators. A total of 1152 air samples were taken from 260 sources on 80 livestock/poultry farms in Minnesota and measured for odor dilution threshold, H2S, and NH3 concentrations. The data were analyzed to determine whether or not H2S and NH3 concentrations correlated with odor dilution threshold. It was found that H 2S was linearly correlated with odor threshold to various degrees. For all animal species, the coefficient of determination (r2) was 0.569. For various swine facilities, the coefficient of determination (r 2) ranged from 0.433 to 0.934. Swine manure storage units had better linear correlation than building sources (r2: 0.701 vs. 0.443). Cattle operations had a weak linear relationship (r2=0.384 to 0.617). Cattle manure storage units had a better linear correlation than building sources (r2: 0.617 vs. 0.384). For all air samples from poultry buildings and composting sites, H2S and odor threshold correlated linearly (r2=0.781). However, this correlation was weaker for poultry buildings (r2=0.279) and composting sites (r2=0.512). These results, indicate that H2S can be used as an odor indicator for some animal facilities. No correlation was found between NH3 and odor threshold except swine wean-to-finishing barns (r2=0.677).

Original languageEnglish (US)
Number of pages11
StatePublished - Dec 1 2000
Event2000 ASAE Annual International Meeting, Technical Papers: Engineering Solutions for a New Century - Milwaukee, WI., United States
Duration: Jul 9 2000Jul 12 2000


Other2000 ASAE Annual International Meeting, Technical Papers: Engineering Solutions for a New Century
CountryUnited States
CityMilwaukee, WI.


  • Ammonia
  • Animal feedlot
  • Hydrogen sulfide
  • Odor

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