Trace Metals (Fe, Cu, Zn, Cd) in Anoxic Environments

  • Jacques Boulègue
Part of the NATO Conference Series book series (NATOCS, volume 9)

Abstract

Anoxic environments can be characterized by the appearance of several reduced sulfur species: hydrogen sulfide, polysulfide ions, organic sulfides and thiosulfate. We have studied the possible complexations of Fe, Cu, Zn and Cd ions by polysulfide and thiosulfate ions. Laboratory results show that Cu(I) is strongly complexed by polysulfide (S4 2− and S5 2−) and thiosulfate and that Cu(II) and Cd are complexed by thiosulfate.

The combination of the above data with previous data on complexation with hydrogen sulfide enables us to describe the possible speciations of the above metals in the following systems: H 2S-H 2O, H 2S-S8 -H2O and H2S-O2-H2O.

These results are employed to explain the concentrations of Fe, Cu, Zn and Cd observed in several anoxic environments (Pavin Lake, Black Sea, Delaware Estuary). A good agreement is obtained between thermodynamic calculations and field measurements.

Recent studies of the sulfur system in reducing conditions in water have been done in the laboratory1–7 and in the field8–12. They have emphasized the importance of the formation of polysulfide ions (HSi ; Si 2−; i > 1). Polysulfide ions are rapidly produced upon reaction of hydrogen sulfide with elemental sulfur or incomplete oxidation of hydrogen sulfide. Polysulfides, elemental sulfur and thiosulfate are the main intermediary products of the incomplete and complete oxidations of hydrogen sulfide as observed in the laboratory6,7,13,14. In reducing environments, one may expect that the variations of concentration of hydrogen sulfide due to environmental changes will bring about changes in the control of metal concentrations by sulfide formation and changes due to possible complexation by sulfide, polysulfides and thiosulfate.

In this paper, we report some results on the speciation of trace metals in anoxic environments and their changes during sulfate reduction.

Keywords

Trace Metal Hydrogen Sulfide Carbonate Sediment Iron Sulfide Anoxic Environment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1983

Authors and Affiliations

  • Jacques Boulègue
    • 1
  1. 1.Laboratoire de Géologie AppliquéeUniversité Pierre et Marie CurieParis Cedex 05France

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