The influence of organic complexation on Ni isotopic fractionation and Ni recycling in the upper soil layers

The quantification of Ni isotopic fractionation induced by Ni binding to organic acids is a preliminary step to better constrain the mechanisms determining Ni isotopic fingerprint observed in surface soils, waters and plants, as well as the contribution of metal recycling during plant litter degrada...

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Bibliographic Details
Published in:Chemical geology 2018-04, Vol.483, p.47-55
Main Authors: Zelano, I.O., Cloquet, C., Fraysse, F., Dong, S., Janot, N., Echevarria, G., Montargès-Pelletier, E.
Format: Article
Language:English
Subjects:
Complexation
Continental interfaces, environment
Earth Sciences
Geochemistry
Hyperaccumulating plants
Isotopic fractionation
Organic matter
Sciences of the Universe
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Summary:The quantification of Ni isotopic fractionation induced by Ni binding to organic acids is a preliminary step to better constrain the mechanisms determining Ni isotopic fingerprint observed in surface soils, waters and plants, as well as the contribution of metal recycling during plant litter degradation. In this study, Ni isotopic fraction induced by reaction with small organic acids, e.g. citric and oxalic acids, and with soil purified humic acids (PHA) was investigated at different Ni-L ratio and pH conditions. The Donnan Membrane Technique was used to separate Ni bound to organic ligands from the free metal. Obtained results highlighted that Ni binding with carboxylic groups produces, in the adopted experimental conditions, a Δ60Nibond-free 
ISSN:0009-2541
1872-6836
DOI:10.1016/j.chemgeo.2018.02.023