Equilibrium distribution of polysulfide ions in aqueous solutions at different temperatures by rapid single phase derivatization

Alexey Kamyshny, Jenny Gun, Dan Rizkov, Tamara Voitsekovski, Ovadia Lev

Research output: Contribution to journalArticlepeer-review

89 Scopus citations

Abstract

Polysulfides are abundant form of reduced sulfur compounds whose distribution in aquatic systems continues to pose environmental challenge. The Gibbs free-energy of formation, enthalpy of formation, and standard entropy of inorganic polysulfides were derived based on measurements of the temperature-dependent distribution of inorganic polysulfides in supersaturated aqueous polysulfide solutions. The data complements the relevant Gibbs free-energy data that were derived in our recent publication. The thermodynamic data show that the average polysulfide length is increased and polysulfides dissolve better at elevated temperatures, though the extent of this increase is pH dependent. At high pH (pH > 10) increasing the temperature from 25 to 80°C results in a 5.6% increase in the concentration of polysulfide bound sulfur (i.e., dissolved zerovalent sulfur) and increases the average chain length (n̄) by 0.2 sulfur atoms, whereas at pH 8.2 the n̄ increases by 0.25, and the dissolved polysulfide sulfur increases three-fold.

Original languageEnglish
Pages (from-to)2395-2400
Number of pages6
JournalEnvironmental Science & Technology
Volume41
Issue number7
DOIs
StatePublished - 1 Apr 2007
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry (all)
  • Environmental Chemistry

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