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Sorption of Organic Carbon Fractions by Spodosol Mineral Horizons

David A. N. Ussiri and C. E. Johnson*

Dep. of Civil and Environmental Engineering, 220 Hinds Hall, Syracuse Univ., Syracuse, NY 13244



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  		Fig. 1. CPMAS 13C nuclear magnetic resonance spectra of the organic C fractions used for the adsorption experiment. HPI, hydrophilic; HPO, hydrophobic.

 


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  		Fig. 2. Initial mass isotherms for the sorption of hydrophobic and hydrophilic organic matter extracted from the Oa horizon to Spodosol horizons. DOC, dissolved organic carbon.

 


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  		Fig. 3. Initial mass isotherms for the sorption of hydrophobic and hydrophilic organic matter extracted from the Bh horizon to Spodosol horizons. DOC, dissolved organic carbon.

 


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  		Fig. 4. Composition of dissolved organic C released to organic-C-free extract solution. HPI, hydrophilic; HPO, hydrophobic.

 


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  		Fig. 5. Relationship between initial organic C (OC) concentration and Al + Fe concentration (Panels a, b), and the relationship between initial OC and the molar OC/(Al + Fe) ratio in the equilibrium solutions (Panels c, d). DOC, dissolved organic carbon; OM, organic matter.

 




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