Diagnostic in situ de la réduction du fer dans les sols par l'utilisation d'un test de terrain colorimétrique

Abstract : Hydromorphy in soils is a sign of a temporary or constant waterlogging and a deficit of oxygen. It plays a role on their properties and their functions. Hydromorphy is revealed by persistent morphological features, resulting from the evolution of the state of iron and manganese in soil. Soil redoximorphic features such as iron and manganese concretions, which result from temporary or permanent waterlogging and oxygen deficit are broadly used for wetland delineation. However within the framework of the wetlands delineation there are major limits associated with the use of soil redoximorphic features for predicting redox conditions. The visual diagnosis can indeed be misleading in the presence of rock weathering features of similar aspect and when fossil redoximorphic features are present in well-drained soils. Colorimetric tests based on the complexation between Fe(II) and color reagents such as phenantroline, offer interesting alternatives. They are cheap and easy to implement in the field. Despite some limits inherent to the reagent itself and to the annual climatic variations at a particular site, the colorimetric test was shown to improve the surveyor’ interpretations. We finally proposed a key analysis tool for redoxic and reductic conditions based on the morphological features diagnosis and the field colorimetric test.
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L Berthier, V. Chaplot, G. Dutin, A Jaffrezic, B Lemercier, et al.. Diagnostic in situ de la réduction du fer dans les sols par l'utilisation d'un test de terrain colorimétrique. Etude et Gestion des Sols, Association française pour l'"étude des sols, 2014, 21 (1), pp.51-59. ⟨hal-01987422⟩

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