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Title: Stimulation by lepidocrocite (. gamma. -FeOOH) of Fe(II)-dependent nitrite reduction

Abstract

Fe(II)-dependent nitrite reduction was studied in oxygen-free reaction flasks at pH values from 6.0 to 8.5 and in the presence and absence of the Fe(III) oxyhydroxide lepidocrocite ({gamma}-FeOOH). When ionic Fe{sup 2+} was added to flasks containing lepidocrocite, rapid Fe{sup 2+} consumption and release of H{sup +} took place. The solid phase turned dark and contained magnetite (Fe{sub 3}O{sub 4}). This reaction was independent of the presence of NO{sub 2}{sup {minus}}. However, rapid NO{sub 2}{sup {minus}} reduction primarily to N{sub 2}O was observed only after the Fe{sup 2+} binding to lepidocrocite was initiated; insignificant NO{sub 2}{sup {minus}} reduction was observed in control flasks without lepidocrocite. Both Fe{sup 2+} binding and associated H{sup +} release and NO{sub 2}{sup {minus}} reduction were negligible at pH values of 7.0 and below, but increased dramatically as pH was raised to 8.5. The Fe(II) associated with a reactive complex formed during Fe{sup 2+} binding to lepidocrocite, and not the ionic Fe{sup 2+}, seemed responsible for the reduction of NO{sub 2}{sup {minus}}. The catalytic effect of Fe(III) oxyhydroxide may stimulate Fe(II)-dependent formation of N{sub 2}O from NO{sub 2}{sup {minus}} (chemodenitrification) in geochemical systems such as sediments and subsoils.

Authors:
 [1];  [2]
  1. Royal Veterinary and Agricultural Univ., Frederiksberg (Denmark)
  2. Univ. of Aarhus (Denmark)
Publication Date:
OSTI Identifier:
6059254
Resource Type:
Journal Article
Journal Name:
Geochimica et Cosmochimica Acta; (United States)
Additional Journal Information:
Journal Volume: 55:5; Journal ID: ISSN 0016-7037
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; IRON HYDROXIDES; CATALYTIC EFFECTS; NITRATES; REMOVAL; SOILS; DENITRIFICATION; ANAEROBIC CONDITIONS; CLAYS; GEOCHEMISTRY; IRON IONS; LAND POLLUTION; MAGNETITE; PH VALUE; REDUCTION; CHARGED PARTICLES; CHEMICAL REACTIONS; CHEMISTRY; HYDROGEN COMPOUNDS; HYDROXIDES; IONS; IRON COMPOUNDS; IRON ORES; MINERALS; NITROGEN COMPOUNDS; ORES; OXIDE MINERALS; OXYGEN COMPOUNDS; POLLUTION; TRANSITION ELEMENT COMPOUNDS; 540220* - Environment, Terrestrial- Chemicals Monitoring & Transport- (1990-); 580000 - Geosciences

Citation Formats

Sorensen, J, and Thorling, L. Stimulation by lepidocrocite (. gamma. -FeOOH) of Fe(II)-dependent nitrite reduction. United States: N. p., 1991. Web. doi:10.1016/0016-7037(91)90307-Q.
Sorensen, J, & Thorling, L. Stimulation by lepidocrocite (. gamma. -FeOOH) of Fe(II)-dependent nitrite reduction. United States. doi:10.1016/0016-7037(91)90307-Q.
Sorensen, J, and Thorling, L. Wed . "Stimulation by lepidocrocite (. gamma. -FeOOH) of Fe(II)-dependent nitrite reduction". United States. doi:10.1016/0016-7037(91)90307-Q.
@article{osti_6059254,
title = {Stimulation by lepidocrocite (. gamma. -FeOOH) of Fe(II)-dependent nitrite reduction},
author = {Sorensen, J and Thorling, L},
abstractNote = {Fe(II)-dependent nitrite reduction was studied in oxygen-free reaction flasks at pH values from 6.0 to 8.5 and in the presence and absence of the Fe(III) oxyhydroxide lepidocrocite ({gamma}-FeOOH). When ionic Fe{sup 2+} was added to flasks containing lepidocrocite, rapid Fe{sup 2+} consumption and release of H{sup +} took place. The solid phase turned dark and contained magnetite (Fe{sub 3}O{sub 4}). This reaction was independent of the presence of NO{sub 2}{sup {minus}}. However, rapid NO{sub 2}{sup {minus}} reduction primarily to N{sub 2}O was observed only after the Fe{sup 2+} binding to lepidocrocite was initiated; insignificant NO{sub 2}{sup {minus}} reduction was observed in control flasks without lepidocrocite. Both Fe{sup 2+} binding and associated H{sup +} release and NO{sub 2}{sup {minus}} reduction were negligible at pH values of 7.0 and below, but increased dramatically as pH was raised to 8.5. The Fe(II) associated with a reactive complex formed during Fe{sup 2+} binding to lepidocrocite, and not the ionic Fe{sup 2+}, seemed responsible for the reduction of NO{sub 2}{sup {minus}}. The catalytic effect of Fe(III) oxyhydroxide may stimulate Fe(II)-dependent formation of N{sub 2}O from NO{sub 2}{sup {minus}} (chemodenitrification) in geochemical systems such as sediments and subsoils.},
doi = {10.1016/0016-7037(91)90307-Q},
journal = {Geochimica et Cosmochimica Acta; (United States)},
issn = {0016-7037},
number = ,
volume = 55:5,
place = {United States},
year = {1991},
month = {5}
}