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LCZO -- Soil Redox Potential - R code for Mössbauer spectral subtraction -- Bisley -- 2018


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Created: May 29, 2019 at 2:27 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

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Resource Level Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Place/Area Name:
Samples analyzed taken at Bisley
North Latitude
18.3220°
East Longitude
-65.7349°
South Latitude
18.3108°
West Longitude
-65.7485°

Temporal

Start Date:
End Date:

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
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

References

Related Resources

The content of this resource serves as the data 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 http://dx.doi.org/10.1021/acs.est.8b01368 How to Cite

How to Cite

Chen, C., C. Meile, J. Wilmoth, D. Barcellos, A. Thompson (2020). LCZO -- Soil Redox Potential - R code for Mössbauer spectral subtraction -- Bisley -- 2018, HydroShare, http://www.hydroshare.org/resource/25db6edfdaa84b94ba6627b0973b3331

This resource is shared under the Creative Commons Attribution CC BY.

 http://creativecommons.org/licenses/by/4.0/
CC-BY

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