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Published online 27 October 2006
Published in J Environ Qual 35:2162-2169 (2006)
DOI: 10.2134/jeq2006.0178
© 2006 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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Sulfadimethoxine Degradation Kinetics in Manure as Affected by Initial Concentration, Moisture, and Temperature

Q.-Q. Wanga,c, S. A. Bradforda, W. Zhenga,b and S. R. Yatesa,*

a USDA-ARS, U.S. Salinity Lab., 450 W. Big Springs Rd., Riverside, CA 92507
b Dep. of Environmental Sciences, Univ. of California, Riverside, CA 92521
c Dep. of Chemistry, Delaware State Univ., Dover, DE 19901


Figure 1
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  		Fig. 1. The percentage of aqueous-phase sulfadimethoxine relative to the total remaining in the manure during the degradation period.

 

Figure 2
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  		Fig. 2. Sulfadimethoxine sorption isotherm in manure at 25°C.

 

Figure 3
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  		Fig. 3. Comparison of the fit of the simple first-order model and the availability-adjusted first-order model for sulfadimethoxine degradation in manure. Points are experimental data and lines are the fitting results.

 

Figure 4
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  		Fig. 4. The degradation kinetics of sulfadimethoxine in (a) nonsterile and (b) sterile manure. Points are experimental data. Lines are fitting results using the adjusted first-order model.

 

Figure 5
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  		Fig. 5. The degradation of sulfadimethoxine in nonsterile manure at different moisture contents. Points are experimental data and lines are model-fitted results using the adjusted first-order model.

 

Figure 6
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  		Fig. 6. The degradation of sulfadimethoxine in nonsterile manure at 25 and 40°C. Points are experimental data and lines are model-fitted results using the adjusted first-order model.

 




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Copyright © 2006 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.