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Voltammetric characterization of Iron(II) sulfide complexes in laboratory solutions and in marine waters and porewaters

Article Abstract:

A study of metal sulfide complexes in marine waters and porewaters aims to use voltammetric and polarographic methods to prove their existence where Fe(II) complexation with sulfide may occur, to indicate that Fe complexes may be linked to FeS2 formmation and to determine the thermodynamic strength of the metal sulfide complexes. Saragasso Sea water was used for standard solutions of Fe(II) and sulfide, which were compared with sulfide complexes from a range of marine waters and porewaters. Results showed that the complexes probably have an important role in pyrite synthesis in porewaters and enclosed areas when zerovalent sulfur is present, and that in unenclosed areas, strong sulfide complexes can move a relatively long way.

CHEMICALS AND ALLIED PRODUCTS

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Development of a gold amalgam voltammetric microelectrode for the determination of dissolved Fe, Mn, O2, and S(-II) in porewaters of marine and freshwater sediments

Article Abstract:

A new solid-state voltammetric gold amalgam microelectrode for measuring dissolved O2, S(-II), Fe and Mn in marine sediment porewaters was developed. In contrast with membrane electrodes which can only measure single species per electrode, the new device provides more information at submillimeter depth resolution on all major redox species occurring in the environment. The results of tests on the electrode are presented and discussed.

Marine sediments, Electrodes

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Determination of metal (bi)sulfide stability constants of Mn2+, Fe2+, Ni2+, Cu2+, and Zn2+ by voltammetric methods

Article Abstract:

The stoichiometry and the conditional and thermodynamic stability constants for Mn2+, Fe2+, Co2+, Ni2+, Cu2+ and Zn2+ were studied using voltammetric techniques. The results showed that the complexes dissociate at pH levels lower than seven. At seawater pH, Zn and Cu sulfide complexes were found to be responsible for the presence of nanomolar levels of sulfide in oxic water.

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