The high adsorption efficiency of Co by Mn-oxides was pointed out by Krauskopf in his pioneering 1956 publication (Krauskopf, 1956). Co-concentrations up to a few wt.% (6% in birnessite: Manceau et al., 1997) correspond to an economic deposit. In soils, Co is fixed by Mn-oxides in a non-extractable form and its bioavailability is inversely proportional to the Mn content of the soil (Burns, 1976). In addition to its geochemical and economic relevance, Co trapping by Mn-oxide surfaces may cause an efficient retention of Co in sediments, with only a small reversibility of the Co...

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