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Arsenic is an ubiquitous element found in the atmosphere, aquatic media, soils, sediments and living organisms. In this work, we studied the behaviour of arsenic within the leaching of contaminated marine sediment. In order to evaluate arsenic mobility, leaching tests were conducted in batch reactors. Leaching experiments were conducted as a function of contact time between the sediment and ultra pure water. Results showed that arsenic and major elements are rapidly leached in an alkaline medium with an equilibrium pH equal to 8. Arsenic removal was studied in phosphoric acid leaching media, its mobility increased as a function of the concentration of phosphates.

Comportement de l’arsenic lors de la lixiviation d’un sédiment marin de dragage contaminé