Low-temperature oxygen trap for maintaining strict anoxic conditions

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

Low-temperature oxygen trap for maintaining strict anoxic conditions

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

Civil and Environmental Engineering

Research output: Contribution to journal › Article › peer-review

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 language	English (US)
Pages (from-to)	1407-1410
Number of pages	4
Journal	Journal of Environmental Engineering
Volume	130
Issue number	11
State	Published - Nov 2004

All Science Journal Classification (ASJC) codes

Environmental Engineering
Civil and Structural Engineering
Environmental Chemistry
General Environmental Science

Cite this

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title = "Low-temperature oxygen trap for maintaining strict anoxic conditions",

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).",

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AU - Jeon, Byong Hun

AU - Dempsey, Brian A.

AU - Royer, Richard A.

AU - Burgos, William D.

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Low-temperature oxygen trap for maintaining strict anoxic conditions

Abstract

All Science Journal Classification (ASJC) codes

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