Equilibria in a sulfide rich water from Enghien-les-Bains,France |
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| Authors: | Jacques Boulegue |
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| Institution: | Laboratoire de Géochimie des Eaux et Laboratoire de Géochimie et Cosmochimie (CNRS LA 196), Université de Paris VII, 2 place Jussieu, 75221 Paris Cedex 05, France |
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| Abstract: | A complete analysis of a sulfide rich water from a sedimentary area has been achieved. The formation of metastable sulfur species (polysulfide ions, colloidal sulfur and thiosulfate) is very important. The relative concentrations of the sulfur species is controlled by bacterial processes (Desulfovibrio and Thiobacteriaceae). Electrochemical measurements and results of the analyses are in agreement. A possible repartition of polysulfide ions is S2?6 ≈- S2?5 >S2?4. This repartition, although out of equilibrium, is characteristic of the processes leading to the formation of the metastable sulfur species.The water is in equilibrium with amorphous FeS formation. When sulfide, polysulfide and thiosulfate complexing of trace metals Cu, Cd and Pb is taken into account, an agreement is reached between their concentrations in water and their concentrations in the FeS precipitate. |
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