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Published online 12 October 2005
Published in J Environ Qual 34:1992-1997 (2005)
DOI: 10.2134/jeq2004.0426
© 2005 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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Trihalomethane Formation Potential of Filter Isolates of Electrolyte-Extractable Soil Organic Carbon

Alex T. Chowa, Fengmao Guob,*, Suduan Gaoc and Richard S. Breuerb

a Hydrology Program, Dep. of Land, Air and Water Resources, Univ. of California, Davis, CA 95616
b Office of Water Quality, Div. of Environ. Services, California Dep. of Water Resources, P.O. Box 942836, Sacramento, CA 94236-0001
c Water Management Res. Lab., USDA-ARS, Parlier, CA 93648



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  		Fig. 1. Extraction and fractionation scheme and operational definitions of organic C fractions. POC, particulate organic carbon; COC, colloidal organic carbon; FCOC, fine colloidal organic carbon; SOC, soluble organic carbon.

 


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  		Fig. 2. Quantity and relative size of particulate organic carbon (POC), colloidal organic carbon (COC), fine colloidal organic carbon (FCOC), and soluble organic carbon (SOC) from H2O-extractable soil organic C.

 


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  		Fig. 3. The THM formation potential of particulate organic carbon (POC), colloidal organic carbon (COC), fine colloidal organic carbon (FCOC), and soluble organic carbon (SOC) from the soils.

 


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  		Fig. 4. Quantities of extractable organic C by different electrolytes. H2O, deionized H2O; POC, particulate organic carbon; COC, colloidal organic carbon; FCOC, fine colloidal organic carbon; SOC, soluble organic carbon. 1Na and 4Na represent Na-based electrolytes with electrical conductivity of 1 and 4 dS m–1, respectively. 1Ca and 4Ca indicate Ca-based electrolytes with electrical conductivity of 1 and 4 dS m–1, respectively.

 


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  		Fig. 5. Trihalomethane formation potential of individual C fractions separated from extractable organic C by different electrolytes. H2O, deionized H2O; POC, particulate organic carbon; COC, colloidal organic carbon; FCOC, fine colloidal organic carbon; SOC, soluble organic carbon.

 




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