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פותח על ידי קלירמאש פתרונות בע"מ -
Copper and zinc speciation in the solution of a soil-sludge mixture
Year:
2002
Source of publication :
Journal of Environmental Quality
Authors :
מינגלגרין, אורי
;
.
פרנקל, חיים
;
.
Volume :
31
Co-Authors:

Vulkan, R., Wyler Dept. of Dryland Agriculture, J. Blaustein Inst. for Desert Res., Ben-Gurion University, Negev, Israel
Mingelgrin, U., ARO, Israel.
Ben-Asher, J., Wyler Dept. of Dryland Agriculture, J. Blaustein Inst. for Desert Res., Ben-Gurion University, Negev, Israel
Frenkel, H., ARO, Israel.

Facilitators :
From page:
193
To page:
203
(
Total pages:
11
)
Abstract:
Only a small fraction of the transition metals content in sludge-amended soils is soluble, and yet this fraction is a major contributor to the mobility and bioavailability of the metals. The chemical species of zinc (Zn) and copper (Cu) in the soluble fractions of soil-sludge mixtures were characterized with respect to their charge, molecular weight, and stoichiometry using ion exchange resin and gel chromatography procedures. The change in the metals' species with time after sludge application was followed for 100 d. Copper in the water extracts of the sludge-sand mixtures was found almost exclusively in low molecular weight (below 1000 Da) complexes. Higher molecular weight (around 2500 Da) dissolved organic carbon (DOC) was present in the extracts as well, but this DOC fraction exhibited little complexation. Copper was present in the extracts mainly as negatively charged species throughout the incubation period, and zinc tended to form zwitter ions. As incubation progressed, the relative content of positively charged Zn in solution increased. Complexation capacity of DOC in sludge water extract, extrapolated to infinite dilution, was 8.75 mM Cu g-1 DOC. When the complexation capacity of the extract is near saturation, a mean Cu-DOC complex can be defined. It consists of 1.9 Cu atoms attached to DOC species containing 5.6 C atoms. Thus, the organic Cu complexes consist primarily of about two Cu ions attached to DOC species containing only five or six C atoms. Amino acids and small peptides or polycarboxylic acids, such as citric acid, thus may be important complexing agents of the metal.
Note:
Related Files :
Amino Acids
bioavailability
chromatography
dilution
sewage
sewage sludge
soil
water
Zinc
עוד תגיות
תוכן קשור
More details
DOI :
Article number:
0
Affiliations:
Database:
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
27753
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:33
Scientific Publication
Copper and zinc speciation in the solution of a soil-sludge mixture
31

Vulkan, R., Wyler Dept. of Dryland Agriculture, J. Blaustein Inst. for Desert Res., Ben-Gurion University, Negev, Israel
Mingelgrin, U., ARO, Israel.
Ben-Asher, J., Wyler Dept. of Dryland Agriculture, J. Blaustein Inst. for Desert Res., Ben-Gurion University, Negev, Israel
Frenkel, H., ARO, Israel.

Copper and zinc speciation in the solution of a soil-sludge mixture
Only a small fraction of the transition metals content in sludge-amended soils is soluble, and yet this fraction is a major contributor to the mobility and bioavailability of the metals. The chemical species of zinc (Zn) and copper (Cu) in the soluble fractions of soil-sludge mixtures were characterized with respect to their charge, molecular weight, and stoichiometry using ion exchange resin and gel chromatography procedures. The change in the metals' species with time after sludge application was followed for 100 d. Copper in the water extracts of the sludge-sand mixtures was found almost exclusively in low molecular weight (below 1000 Da) complexes. Higher molecular weight (around 2500 Da) dissolved organic carbon (DOC) was present in the extracts as well, but this DOC fraction exhibited little complexation. Copper was present in the extracts mainly as negatively charged species throughout the incubation period, and zinc tended to form zwitter ions. As incubation progressed, the relative content of positively charged Zn in solution increased. Complexation capacity of DOC in sludge water extract, extrapolated to infinite dilution, was 8.75 mM Cu g-1 DOC. When the complexation capacity of the extract is near saturation, a mean Cu-DOC complex can be defined. It consists of 1.9 Cu atoms attached to DOC species containing 5.6 C atoms. Thus, the organic Cu complexes consist primarily of about two Cu ions attached to DOC species containing only five or six C atoms. Amino acids and small peptides or polycarboxylic acids, such as citric acid, thus may be important complexing agents of the metal.
Scientific Publication
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