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Published online 20 April 2005
Published in J Environ Qual 34:842-853 (2005)
DOI: 10.2134/jeq2004.0241
© 2005 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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Advanced Thermal Characterization of Fractionated Natural Organic Matter

Rossane C. DeLappa, Eugene J. LeBoeufa,*, Jie Chenb and Baohua Guc

a Department of Civil and Environmental Engineering, Vanderbilt University, Nashville, TN 37325
b State Agricultural Laboratory, Arizona Department of Agriculture, 2422 West Holly, Phoenix, AZ 85009
c Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831-6036



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  		Fig. 1. (a) Thermal mechanical analysis (TMA) scan of Harpeth humic acid (HHA), noting initial thermal transition (T1) near 21°C, and second transition (T2) at 43°C; (b) TMA scan of Harpeth fulvic acid (HFA), noting initial transition (T1) near –7°C, second transition (T2) near 30°C, and third transition (T3) near 54°C; (c) TMA scan of Georgetown humic acid (GHA) and Georgetown fulvic acid (GFA) indicating a transition near 21 and 17°C, respectively; (d) TMA scan of Harpeth carbohydrate (HCH) indicating transitions near –23 and 22°C.

 


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  		Fig. 2. (a) Standard differential scanning calorimetry (DSC) scan of Harpeth humin (HHU); (b) temperature-modulated differential scanning calorimetry (TMDSC) scan of HHU.

 


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  		Fig. 3. (a) Standard differential scanning calorimetry (DSC) scan of Georgetown carbohydrate (GCH); (b) temperature-modulated differential scanning calorimetry (TMDSC) scan of GCH.

 




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