Cited by 155Electrochemical Analysis and ApplicationsGeochemistry and Elemental AnalysisChemical and Physical Properties in Aqueous Solutions

Determination of Metal (Bi)Sulfide Stability Constants of Mn2+, Fe2+, Co2+, Ni2+, Cu2+, and Zn2+by Voltammetric Methods

Luther, George W., Rickard, David T., Theberge, Stephen, Olroyd, Anthony·1996·Environmental Science & Technology

Abstract

The stoichiometry as well as the conditional and thermodynamic stability constants for the (bi)sulfide complexes of the +2 cations of Mn, Fe, Ni, Co, Cu, and Zn have been determined by voltammetric methods in seawater and chloride solutions of varying ionic strength. Acid−base titrations allowed for the determination of the proton stoichiometry of the complexes. Mn, Fe, Ni, and Co form bisulfide, HS -, complexes of stoichiometry MSH +, M 2 (SH) 3+, and M 3 (SH) 5+, which are labile under diffusion control conditions, in seawater at pH values > 7. These complexes dissociate below pH = 7, releasing H 2 S from solution. Evidence for sulfide-rich complexes of form M(SH) 2 was not found. Cu and Zn form sulfide, S 2 -, complexes of stoichiometry MS and M 2 S 3 2 -, which are inert (nonlabile) under diffusion control conditions, in seawater at pH values > 7. There is no evidence for metal-rich sulfide complexes of stoichiometry [M x S] 2 x - 2 from the titration data. The M 2 S 3 2 - complexes are tetrameric structures (M 4 S 6 ) with tetrahedral metal coordination based on known thiolate complex and mineral geometries. The Zn complexes dissociate below pH = 6.7, releasing H 2 S from solution. However, the Cu complex does not fully dissociate below pH = 2 because of Cu(II) reduction and production of polysulfide, which do not appear to be quantitative. At seawater pH, both Zn and Cu sulfide complexes can be deposited on a mercury drop, indicating that these metal complexes are likely responsible for the presence of nanomolar levels of sulfide in oxic seawater.

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Research works printed but not linked: 13

  1. Luther G. W., 1991, Deep Sea Res., 38, S1137
  2. Millero F., 1991, J. Estuarine Coastal Shelf Sci., 33, 527
  3. Zhang J.-Z., 1994, J. Anal. Chim. Acta, 284, 504
  4. Daskalakis K. D., 1993, Environ. Sci. Technol., 26, 2468
  5. Thompson R. A., 1994, Geochim. Cosmochim. Acta, 58, 2983
  6. Helz G. R., 1993, Geochim. Cosmochim. Acta, 57, 25
  7. Meites L., 1965, 2nd. ed.
  8. DeFord D. D., 1951, J. Am. Chem. Soc., 73, 5322
  9. Radford-Knoery J., 1994, Geochim. Cosmochim. Acta, 58, 5431
  10. Gubeli A. O., 1967, Can. J. Chem., 45, 2108
  11. Cotton, F. A.; Wilkinson, G. 1988.Advanced Inorganic Chemistry; John Wiley & Sons:  New York, 1988; p 1455.
  12. Wells, A. F.Structural Inorganic Chemistry,5th ed.; Oxford:  Clarendon, 1986; p 1382.
  13. Williams R. J. P., 1995, Chem. Int., 17, 49

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Authors
Luther, G. W., Rickard, D. T., Theberge, S., & Olroyd, A.
Affiliations
University of Delaware (US)
Venue
Environmental Science & Technology
Published
1996-01-01
Volume
30
Issue
2
Pages
671-679
ISSN
  • 0013-936X (ISSN-L)
  • 1520-5851
OpenAlex
W4253009332
Cited by
155
References
35
Citations by year
2026: 1 · 2025: 2 · 2024: 4 · 2023: 3 · 2022: 3 · 2021: 4 · 2020: 6 · 2019: 3 · 2018: 6 · 2017: 4 · 2016: 7 · 2015: 7 · 2014: 8 · 2013: 4 · 2012: 8
FWCI
6.12
Type
journal article
Language
en
Open access
closed
Locations
  • Environmental Science & Technology (publishedVersion)
  • ORCA Online Research @Cardiff (Cardiff University) (submittedVersion)
Topics
  • Physical Sciences › Chemistry › Electrochemistry › Electrochemical Analysis and Applications
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
  • Physical Sciences › Chemical Engineering › Filtration and Separation › Chemical and Physical Properties in Aqueous Solutions
Keywords
sulfide complexes, stability constants, conditional stability constants, proton stoichiometry, manganese, iron, cobalt, nickel, copper, zinc, seawater, chloride solutions, ionic strength, acid-base titration, hydrogen sulfide release, polysulfides, copper(II) reduction, tetrahedral coordination, metal sulfide precipitation

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