Low-temperature oxygen trap for maintaining strict anoxic conditions

Byong Hun Jeon, Brian A. Dempsey, Richard A. Royer, William D. Burgos

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

A low-temperature O2 trap was designed in order to achieve strict anoxic conditions. The work was motivated by observation of slow oxidation of Fe(II) in an anaerobic chamber, leading to an estimated 3.8 × 10-7 atm O2 (well below the O2 monitor detection limit) despite recirculation of the N2:H 2 atmosphere across a Pd catalyst. Very low O 2 activity inside an "anaerobic" chamber can result in erroneous conclusions regarding oxidation-reduction reactivities in anoxic environments. The O2 trap consisted of two sequential barrier suspensions with 93.2 mM Fe(III) as ferric hydroxide, 0.90 mM FeCl2, and pH 8.1. The partial press ure Of O2 was estimated to be less than 7.5 × 10 -9 atm O2 when reactors were attached to the traps, based on no observed oxidation of Fe(II).

Original languageEnglish (US)
Pages (from-to)1407-1410
Number of pages4
JournalJournal of Environmental Engineering
Volume130
Issue number11
StatePublished - Nov 2004

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Civil and Structural Engineering
  • Environmental Chemistry
  • Environmental Science(all)

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