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Voltammetric Behavior of MoS $\rm{ {_{4}^{2-}}}$ and SbS $\rm{ {_{4}^{3-}}}$ as Possible Components of “Dissolved Sulfide” in Oxic Natural Waters
Author(s) -
Ciglenečki Irena,
Helz George R.
Publication year - 2003
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200390016
Subject(s) - sulfide , sulfur , chemistry , mercury (programming language) , inorganic chemistry , cathodic stripping voltammetry , metal , environmental chemistry , voltammetry , dissolved organic carbon , electrochemistry , electrode , organic chemistry , computer science , programming language
Nanomolar concentrations of dissolved sulfide have been observed in O 2 ‐ bearing natural waters. The sulfide consists of oxidation‐resistant, unknown chemical components that might include metal‐sulfide complexes, elemental sulfur in various forms or organic sulfur compounds. Here we show that thioanions are also plausible components. Tetrathiomolybdate and tetrathioantimonate ions deposit respectively 3 and 4 equivalents of HgS at mercury electrodes. In cathodic stripping voltammetry, a common method to quantify nanomolar sulfide in nature, MoS $\rm{ {_{4}^{2-}}}$ and SbS $\rm{ {_{4}^{3-}}}$ would therefore contribute to “total dissolved sulfide.” Limited evidence suggests that thioanions may be powerful complexing agents that would be capable of affecting trace metal speciation and bioavailability in natural waters.