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Title: Soil solution Cd, Cu and Zn concentrations as affected by short-time drying or wetting: The role of hydrous oxides of Fe and Mn
Authors: Tack, FMG
Van Ranst, E
LIEVENS, Caroline 
Vandenberghe, RE
Issue Date: 2006
Source: GEODERMA, 137(1-2). p. 83-89
Abstract: Soil solution metal concentrations are affected, among others, by hydrous oxides of iron and manganese. In a greenhouse study, eight selected soils were subjected to different moisture regimes mimicking during 2 weeks (1) strongly oxidizing conditions of a completely dry surface soil; (2) moist, oxic conditions at field capacity; and (3) a short period of flooding and, hence, the establishment of temporarily low oxygen conditions. Hydrous oxides were characterized using selective extractions, X-ray diffraction and Mossbauer spectroscopy. The moisture regimes did not significantly alter the 0.25 M NH2OH center dot HCl+0.25 M HCl-extractable ("amorphous iron oxides") nor the 0.04 M NH2OH-HCl+25% HOAc-extractable ("amorphous+crystalline iron oxides") Fe, Mn and Al. X-ray diffraction and Mossbauer spectroscopy revealed that no major conversions or changes in degree of crystallization or redox state had occurred in any of the soils as a result of the 2-week events of flooding or drought. In sandy and acidic or poorly buffered soils that had been dried, soil solution metal concentrations were between 2 and 40 times higher than in the corresponding reference soils that had been kept at field capacity all the time. Soils that had been saturated tended to have slightly lower concentrations of metals in the soil solution. While the importance of iron oxides should not be neglected, it is clear that it is not the single dominant factor. Soil solution metal concentrations at one moment of time may significantly depend on previous soil moisture conditions. (c) 2006 Elsevier B.V. All rights reserved.
Notes: Univ Ghent, Dept Appl Analyt & Phys Chem, Lab Analyt Chem & Appl Ecochem, B-9000 Ghent, Belgium. Univ Ghent, Dept Geol & Soil Sci, Lab Soil Sci, B-9000 Ghent, Belgium. Univ Hasselt, Dept SBG, Lab Appl Chem, B-3590 Diepenbeek, Belgium. Univ Ghent, Dept Subatom & Radiat Phys, B-9000 Ghent, Belgium.Tack, FMG, Univ Ghent, Dept Appl Analyt & Phys Chem, Lab Analyt Chem & Appl Ecochem, Coupure Links 265, B-9000 Ghent,
Keywords: heavy metals; Mossbauer spectroscopy; X-ray diffraction; selective dissolution
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ISSN: 0016-7061
e-ISSN: 1872-6259
DOI: 10.1016/j.geoderma.2006.07.003
ISI #: 000243601000008
Category: A1
Type: Journal Contribution
Validations: ecoom 2008
Appears in Collections:Research publications

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