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Published online 11 May 2005
Published in J Environ Qual 34:1131-1137 (2005)
DOI: 10.2134/jeq2004.0378
© 2005 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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Proton Binding by Humic and Fulvic Acids from Pig Slurry and Amended Soils

César Plazaa,*, Juan C. García-Gila, Alfredo Poloa, Nicola Senesib and Gennaro Brunettib

a Centro de Ciencias Medioambientales, Consejo Superior de Investigaciones Científicas, Serrano 115 dpdo., 28006 Madrid, Spain
b Dipartimento di Biologia e Chimica Agroforestale ed Ambientale, University of Bari, Via Amendola 165/A, 70126 Bari, Italy



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  		Fig. 1. Negative charge of humic acids (HAs) isolated from pig slurry (PS), control soil (PS0), and soils amended with pig slurry at a rate of either 90 or 150 m3 ha–1 yr–1 for 3 yr (PS90 and PS150, respectively) versus proton concentration in solution.

 


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  		Fig. 2. Negative charge of fulvic acids (FAs) isolated from pig slurry (PS), control soil (PS0), and soils amended with pig slurry at a rate of either 90 or 150 m3 ha–1 yr–1 for 3 yr (PS90 and PS150, respectively) versus proton concentration in solution.

 


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  		Fig. 3. Affinity distributions for proton binding by humic acids (HAs) isolated from pig slurry (PS), control soil (PS0), and soils amended with pig slurry at a rate of either 90 or 150 m3 ha–1 yr–1 for 3 yr (PS90 and PS150, respectively).

 


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  		Fig. 4. Affinity distributions for proton binding by fulvic acids (FAs) isolated from pig slurry (PS), control soil (PS0), and soils amended with pig slurry at a rate of either 90 or 150 m3 ha–1 yr–1 for 3 yr (PS90 and PS150, respectively).

 




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