Elucidation of the mechanism of reaction between S2O 82-, selenite and Mn2+ in aqueous solution and limestone-gypsum FGD liquor

Hiroyuki Akiho, Shigeo Ito, Hiromitsu Matsuda, Toshiaki Yoshioka

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The mechanism of reaction between peroxodisulfate ion (S2O 82-), selenite (Se(IV)O32-) and Mn2+ as an inhibitor of selenite oxidation was studied using aqueous solutions composed of commercial reagents, as well as limestone-gypsum flue gas desulfurization (FGD) liquors sampled from coal fired power plants. The oxidation of selenite to selenate (Se(VI)O42-) is promoted by the sulfate ion radical (SO4-) which results from decomposition of S2O82-. In the presence of Mn2+, selenite oxidation was prevented due to the difference in rates of reaction with SO4-. The ratio of the oxidation rate constants of selenite and Mn2+ with SO4- was determined over a temperature range of 40-60 C, and was found to be little influenced by the various coexisting components in FGD liquors.

Original languageEnglish
Pages (from-to)11311-11317
Number of pages7
JournalEnvironmental Science and Technology
Volume47
Issue number19
DOIs
Publication statusPublished - 2013 Oct 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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