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Copper and Zinc Speciation in the Solution of a Soil–Sludge Mixture

R. Vulkan*,a, U. Mingelgrinb, J. Ben-Ashera and H. Frenkelc

a The Wyler Department of Dryland Agriculture, The Jacob Blaustein Institute for Desert Research, Ben-Gurion University, Sede Boqer Campus 84990, Israel
b Institute of Soils, Water and Environmental Sciences, The Volcani Center, ARO, P.O.B. 6, Bet Dagan 50250, Israel
c Institute of Soils, Water and Environmental Sciences, The Volcani Center, ARO, P.O.B. 6, Bet Dagan 50250, Israel



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  		Fig. 1. Gel chromatogram of the aqueous extract of the sludge (2:25 sludge to water ratio). (A) Dissolved organic carbon (DOC) and Cu concentrations in leachates of the gel column as a function of the inverse logarithmic function of the molecular weight (Kav). (B) Molecular weight as a function of Kav.

 


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  		Fig. 2. Concentration of Cu (A) and dissolved organic carbon (DOC) (B) in effluents from gel chromatography columns. Samples of 2 mL sludge extract (sludge to water ratio 2:25) or of dilutions of that extract to ratios of 1:50 and 1:100 sludge to water, respectively, were applied to the column in each run.

 


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  		Fig. 3. Effect of incubation time on the molecular weight (MW) distribution of dissolved organic carbon (DOC) species in a 1:1 water extract of soil loaded with 20% sludge. Kav is the inverse logarithmic function of the molecular weight.

 


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  		Fig. 4. Effect of incubation time on the molecular weight (MW) distribution of Cu species in a 1:1 water extract of soil loaded with 20% sludge. Kav is the inverse logarithmic function of the molecular weight.

 


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  		Fig. 5. Effect of incubation time on the distribution of Cu species according to their charge in a water extract of the sewage sludge.

 


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  		Fig. 6. Effect of incubation time on the distribution of Zn species according to their charge in a water extract of the sewage sludge.

 




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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Soil Science Society of America Journal Journal of Plant Registrations The Plant Genome
Copyright © 2002 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.