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Created: | May 29, 2019 at 2:27 p.m. | |
Last updated: | Apr 13, 2020 at 5:20 p.m. | |
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Abstract
Ferrous iron (FeII) oxidation is an important pathway for generating reactive FeIII phases in soils, which can affect organic carbon (OC) persistence/decomposition. We explored how pO2 concentration influences FeII oxidation rates and FeIII mineral composition, and how this impacts the subsequent FeIII reduction and anaerobic OC mineralization following a transition from oxic to anoxic conditions. We conducted batch soil slurry experiments within a humid tropical forest soil amended with isotopically labeled 57FeII. The slurries were oxidized with either 21% or 1% pO2 for 9 days and then incubated for 20 days under anoxic conditions. Exposure to 21% pO2 led to faster FeII oxidation rates and greater partitioning of the amended 57Fe into low-crystallinity FeIII-(oxyhydr)oxides (based on Mössbauer analysis) than exposure to 1% pO2. During the subsequent anoxic period, low-crystallinity FeIII-(oxyhydr)oxides were preferentially reduced relative to more crystalline forms with higher net rates of anoxic FeII and CO2 production—which were well correlated—following exposure to 21% pO2 than to 1% pO2. This study illustrates that in redox-dynamic systems, the magnitude of O2 fluctuations can influence the coupled iron and organic carbon cycling in soils and more broadly, that reaction rates during periods of anoxia depend on the characteristics of prior oxidation events.
R-code for Spectral Subtraction for 57Fe-spiked samples developed for:
Chen, Chunmei, Christof Meile, Jared Wilmoth, Diego Barcellos, and Aaron Thompson (2018): Influence of pO2 on iron redox cycling and anaerobic organic carbon mineralization in a humid tropical forest soil. Environmental Science & Technology 52 (14): 7709-7719. DOI: 10.1021/acs.est.8b01368
Subject Keywords
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Content
ReadMe.md
LCZO -- Soil Redox Potential -- Redox cycling -- Bisley -- (2018)
OVERVIEW
Description/Abstract
Ferrous iron (FeII) oxidation is an important pathway for generating reactive FeIII phases in soils, which can affect organic carbon (OC) persistence/decomposition. We explored how pO2 concentration influences FeII oxidation rates and FeIII mineral composition, and how this impacts the subsequent FeIII reduction and anaerobic OC mineralization following a transition from oxic to anoxic conditions. We conducted batch soil slurry experiments within a humid tropical forest soil amended with isotopically labeled 57FeII. The slurries were oxidized with either 21% or 1% pO2 for 9 days and then incubated for 20 days under anoxic conditions. Exposure to 21% pO2 led to faster FeII oxidation rates and greater partitioning of the amended 57Fe into low-crystallinity FeIII-(oxyhydr)oxides (based on Mössbauer analysis) than exposure to 1% pO2. During the subsequent anoxic period, low-crystallinity FeIII-(oxyhydr)oxides were preferentially reduced relative to more crystalline forms with higher net rates of anoxic FeII and CO2 production—which were well correlated—following exposure to 21% pO2 than to 1% pO2. This study illustrates that in redox-dynamic systems, the magnitude of O2 fluctuations can influence the coupled iron and organic carbon cycling in soils and more broadly, that reaction rates during periods of anoxia depend on the characteristics of prior oxidation events.
Creator/Author
Chen, Chunmei|Christof Meile|Jared Wilmoth|Diego Barcellos|Aaron Thompson
CZOs
Luquillo
Contact
Miguel Leon, Miguel.Leon@unh.edu
Subtitle
Ferrous Iron Oxidation under Varying pO2 Levels: The Effect of Fe(III)/Al(III) Oxide Minerals and Organic Matter
SUBJECTS
Disciplines
Biogeochemistry|Soil Science / Pedology
Topics
Soil Redox Potential
Subtopic
Redox cycling
Keywords
Iron redox cycling|anaerobic organic carbon minerlization|oxygen|Mössbauer spectroscopy|iron oxides
Variables
iron|ferric ion|ferrous ion|dissolved iron|clay|goethite|ferrihydrite
Variables ODM2
Iron|Goethite
TEMPORAL
Date Start
2018-01-01
Date End
2018-01-31
SPATIAL
Field Areas
Bisley
Location
Bisley
North latitude
18.3202
South latitude
18.3053
West longitude
-65.7494
East longitude
-65.7346
REFERENCE
Citation
Chen, Chunmei, Christof Meile, Jared Wilmoth, Diego Barcellos, and Aaron Thompson (2018): Influence of pO2 on iron redox cycling and anaerobic organic carbon mineralization in a humid tropical forest soil. Environmental Science & Technology 52 (14): 7709-7719. DOI: 10.1021/acs.est.8b01368
Publications of this data
Chen, Chunmei, Christof Meile, Jared Wilmoth, Diego Barcellos, and Aaron Thompson (2018). Influence of pO2 on iron redox cycling and anaerobic organic carbon mineralization in a humid tropical forest soil. Environmental Science & Technology 52 (14): 7709-7719 http://dx.doi.org/10.1021/acs.est.8b01368
CZO ID
7170
Additional Metadata
Name | Value |
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czos | Luquillo |
czo_id | 7170 |
citation | Chen, Chunmei, Christof Meile, Jared Wilmoth, Diego Barcellos, and Aaron Thompson (2018): Influence of pO2 on iron redox cycling and anaerobic organic carbon mineralization in a humid tropical forest soil. Environmental Science & Technology 52 (14): 7709-7719. DOI: 10.1021/acs.est.8b01368 |
keywords | Iron redox cycling, anaerobic organic carbon minerlization, oxygen, Mössbauer spectroscopy, iron oxides |
subtitle | Ferrous Iron Oxidation under Varying pO2 Levels: The Effect of Fe(III)/Al(III) Oxide Minerals and Organic Matter |
variables | iron, ferric ion, ferrous ion, dissolved iron, clay, goethite, ferrihydrite |
disciplines | Biogeochemistry, Soil Science / Pedology |
Related Resources
This resource is referenced by | Chen, Chunmei, Christof Meile, Jared Wilmoth, Diego Barcellos, and Aaron Thompson (2018). Influence of pO2 on iron redox cycling and anaerobic organic carbon mineralization in a humid tropical forest soil. Environmental Science & Technology 52 (14): 7709-7719 http://dx.doi.org/10.1021/acs.est.8b01368 How to Cite |
The content of this resource is derived from | https://doi.org/10.1021/acs.est.8b01368 |
How to Cite
This resource is shared under the Creative Commons Attribution CC BY.
http://creativecommons.org/licenses/by/4.0/
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