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Published online 20 February 2008
Published in J Environ Qual 37:565-573 (2008)
DOI: 10.2134/jeq2006.0417
© 2008 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Abundances and Flux Estimates of Volatile Organic Compounds from a Dairy Cowshed in Germany

Ngwa Martin Ngwabiea,b, Gunnar W. Schadea,c,*, Thomas G. Custerd, Stefan Linkee and Torsten Hinze

a Inst. of Environmental Physics, Univ. of Bremen, Bremen, Germany
b Dep. of Agricultural Biosystems and Technology, Swedish Univ. of Agricultural Sciences, Alnarp, Sweden
c Dep. of Atmospheric Sciences, Texas A&M Univ., College Station, TX 77843
d Max Planck Inst. for Chemistry, Dep. of Atmospheric Chemistry, Mainz, Germany
e Federal Agricultural Research Centre, Braunschweig, Germany


Figure 1
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  		Fig. 1. Experimental setup for monitoring gaseous emissions in animal housing (PFA, perfluoroalkoxy; PTR-MS, proton transfer reaction mass spectrometer).

 

Figure 2
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  		Fig. 2. Propionic acid/butyric acid correlation.

 

Figure 3
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  		Fig. 3. Time series of calibrated volatile organic compounds (VOCs) in the cowshed.

 

Figure 4
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  		Fig. 4. Sample emission model for an evening acetaldehyde spike. Open circles are measured mixing ratio, crosses represent individual mixing ratios added by the assumption of a bell-shaped emissions surge (offset in time for clarity). The dashed line shows the result of those emissions without, and the solid line the modeled result with shed air dilution.

 




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