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Title: Evolution of iron minerals in a 100years-old Technosol. Consequences on Zn mobility

Abstract

The prediction of the long term trace element mobility in anthropogenic soils would be a way to anticipate land management and should help in reusing slightly contaminated materials. In the present study, iron (Fe) and zinc (Zn) status evolution was investigated in a 100-year old Technosol. The site of investigation is an old brownfield located in the Nord-Pas-de-Calais region (France) which has not been reshaped since the beginning of the last century. The whole soil profile was sampled as a function of depth, and trace elements mobility at each depth was determined by batch leaching test. A specific focus on Fe and Zn status was carried out by bulk analyses, such as selective dissolution, X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS). Fe and Zn status in the profile samples was also studied using laterally resolved techniques such as μ-particle induced X-ray emission (μ-PIXE) and μ-Rutherford backscattering spectroscopy (μ-RBS). The results indicate that (i) Fe is mainly under Fe(III) form, except a minor contribution of Fe(II) in the deeper samples, (ii) some Fe species inherited from the past have been weathered and secondary minerals are constituted of metal-bearing sulphates and Fe (hydr)oxides, (iii) ferrihydrite is formed during pedogenesis (iv) 20more » to 30% more Fe (hydr)oxides are present in the surface than in depth and (v) Zn has tetrahedral coordination and is sorbed to phases of increasing crystallinity when depth increases. Zn-bearing phases identified in the present study are: complex Fe, Mn, Zn sulphides, sulphates, organic matter, and ferrihydrite. Soil formation on such material does not induce a dramatic increase of Zn solubility since efficient scavengers are concomitantly formed in the system. However, Technosols are highly heterogeneous and widely differ from one place to another. The behavior examined in this study is not generic and will depend on the type of Technosol and on the secondary minerals formed as well as on the nature and amount of organic matter.« less

Authors:
ORCiD logo; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE
OSTI Identifier:
1338219
Resource Type:
Journal Article
Resource Relation:
Journal Name: Geoderma; Journal Volume: 290; Journal Issue: C
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE

Citation Formats

Coussy, Samuel, Grangeon, Sylvain, Bataillard, Philippe, Khodja, Hicham, Maubec, Nicolas, Faure, Pierre, Schwartz, Christophe, and Dagois, Robin. Evolution of iron minerals in a 100years-old Technosol. Consequences on Zn mobility. United States: N. p., 2017. Web. doi:10.1016/j.geoderma.2016.12.009.
Coussy, Samuel, Grangeon, Sylvain, Bataillard, Philippe, Khodja, Hicham, Maubec, Nicolas, Faure, Pierre, Schwartz, Christophe, & Dagois, Robin. Evolution of iron minerals in a 100years-old Technosol. Consequences on Zn mobility. United States. doi:10.1016/j.geoderma.2016.12.009.
Coussy, Samuel, Grangeon, Sylvain, Bataillard, Philippe, Khodja, Hicham, Maubec, Nicolas, Faure, Pierre, Schwartz, Christophe, and Dagois, Robin. Wed . "Evolution of iron minerals in a 100years-old Technosol. Consequences on Zn mobility". United States. doi:10.1016/j.geoderma.2016.12.009.
@article{osti_1338219,
title = {Evolution of iron minerals in a 100years-old Technosol. Consequences on Zn mobility},
author = {Coussy, Samuel and Grangeon, Sylvain and Bataillard, Philippe and Khodja, Hicham and Maubec, Nicolas and Faure, Pierre and Schwartz, Christophe and Dagois, Robin},
abstractNote = {The prediction of the long term trace element mobility in anthropogenic soils would be a way to anticipate land management and should help in reusing slightly contaminated materials. In the present study, iron (Fe) and zinc (Zn) status evolution was investigated in a 100-year old Technosol. The site of investigation is an old brownfield located in the Nord-Pas-de-Calais region (France) which has not been reshaped since the beginning of the last century. The whole soil profile was sampled as a function of depth, and trace elements mobility at each depth was determined by batch leaching test. A specific focus on Fe and Zn status was carried out by bulk analyses, such as selective dissolution, X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS). Fe and Zn status in the profile samples was also studied using laterally resolved techniques such as μ-particle induced X-ray emission (μ-PIXE) and μ-Rutherford backscattering spectroscopy (μ-RBS). The results indicate that (i) Fe is mainly under Fe(III) form, except a minor contribution of Fe(II) in the deeper samples, (ii) some Fe species inherited from the past have been weathered and secondary minerals are constituted of metal-bearing sulphates and Fe (hydr)oxides, (iii) ferrihydrite is formed during pedogenesis (iv) 20 to 30% more Fe (hydr)oxides are present in the surface than in depth and (v) Zn has tetrahedral coordination and is sorbed to phases of increasing crystallinity when depth increases. Zn-bearing phases identified in the present study are: complex Fe, Mn, Zn sulphides, sulphates, organic matter, and ferrihydrite. Soil formation on such material does not induce a dramatic increase of Zn solubility since efficient scavengers are concomitantly formed in the system. However, Technosols are highly heterogeneous and widely differ from one place to another. The behavior examined in this study is not generic and will depend on the type of Technosol and on the secondary minerals formed as well as on the nature and amount of organic matter.},
doi = {10.1016/j.geoderma.2016.12.009},
journal = {Geoderma},
number = C,
volume = 290,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}
}
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