Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Immobilization of cadmium and zinc in soil by Al-montmorillonite and gravel sludge
Authors: Lothenbach, B.
Krebs, R.
Furrer, G.
Gupta, S. K.
Schulin, R.
DOI: 10.1046/j.1365-2389.1998.00140.x
Published in: European Journal of Soil Science
Volume(Issue): 49
Issue: 1
Pages: 141
Pages to: 148
Issue Date: Oct-1998
Publisher / Ed. Institution: Wiley
ISSN: 1351-0754
1365-2389
Language: English
Subject (DDC): 363: Environmental and security problems
Abstract: We investigated the potential of montmorillonite, Al‐montmorillonite and gravel sludge to immobilize polluting heavy metals in agricultural soil. Batch experiments showed that both Al‐montmorillonite and montmorillonite immobilized zinc and cadmium. Zinc was bound specifically on Al‐montmorillonite and became increasingly incorporated into the interlayer hydroxy‐Al polymer, whereas there was no specific sorption on montmorillonite. Cadmium was bound on montmorillonite and Al‐montmorillonite unspecifically by cation exchange, but there was no incorporation into the lattice. In pot experiments montmorillonite, Al‐montmorillonite, or gravel sludge were added to a soil contaminated with zinc and cadmium. Increasing doses of these agents decreased the concentrations of NaNO3‐extractable zinc and cadmium. Aluminium‐montmorillonite and gravel sludge were more efficient than montmorillonite in immobilizing both zinc and cadmium. Remobilization tests at pH between 4 and 5.5 showed that cadmium and zinc desorbed more easily from montmorillonite than from Al‐montmorillonite. Gravel sludge application increased the buffer capacity of the contaminated soil substantially. The binding agents decreased zinc concentrations in red clover (Trifolium pratense), and gravel sludge also reduced the cadmium concentrations.
URI: https://digitalcollection.zhaw.ch/handle/11475/11603
Fulltext version: Published version
License (according to publishing contract): Licence according to publishing contract
Departement: Life Sciences and Facility Management
Organisational Unit: Institute of Natural Resource Sciences (IUNR)
Appears in Collections:Publikationen Life Sciences und Facility Management

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