Electron Transfer,Atom Exchange,and Transformation of Iron Minerals in Soils;The Influence of Soil Organic Matter

Chunmei Chen; Yanjun Dong; Aaron Thompson

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Electron Transfer,Atom Exchange,and Transformation of Iron Minerals in Soils;The Influence of Soil Organic Matter

机译：Electron Transfer,Atom Exchange,and Transformation of Iron Minerals in Soils;The Influence of Soil Organic Matter

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Despite substantial experimental evidence of electron transfer,atom exchange,and mineralogical transformation during the reaction of Fe(II)_(aq)with synthetic Fe(III)minerals,these processes are rarely investigated in natural soils.Here,we used an enriched Fe isotope approach and Mossbauer spectroscopy to evaluate how soil organic matter(OM)influences Fe(II)/Fe(III)electron transfer and atom exchange in surface soils collected from Luquillo and Calhoun Experimental Forests and how this reaction might affect Fe mineral composition.Following the reaction of ~(57)Fe-enriched Fe(II)_(aq)with soils for 33 days,Mossbauer spectra demonstrated marked electron transfer between sorbed Fe(II)and the underlying Fe(III)oxides in soils.Comparing the untreated and OM-removed soils indicates that soil OM largely attenuated Fe(II)/Fe(III)electron transfer in goethite,whereas electron transfer to ferrihydrite was unaffected.Soil OM also reduced the extent of Fe atom exchange.Following reaction with Fe(II)_(aq)for 33 days,no measurable mineralogical changes were found for the Calhoun soils enriched with high-crystallinity goethite,while Fe(II)did drive an increase in Fe oxide crystallinity in OM-removed LCZO soils having low-crystallinity ferrihydrite and goethite.However,the presence of soil OM largely inhibited Fe(II)-catalyzed increases in Fe mineral crystallinity in the LCZO soil.Fe atom exchange appears to be commonplace in soils exposed to anoxic conditions,but its resulting Fe(II)-induced recrystallization and mineral transformation depend strongly on soil OM content and the existing soil Fe phases.

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《Environmental Science & Technology: ES&T》 |2023年第29期|10696-10707|共12页
作者
Chunmei Chen; Yanjun Dong; Aaron Thompson;
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作者单位

School of Earth System Science,Tianjin University,Tianjin 300072,China;

Department of Crop and Soil Sciences,University of Georgia,Athens,Georgia 30602,United States;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
iron electron transfer; iron atom exchange; iron mineral transformation; Mossbauer spectroscopy; organic matter-mineral interactions;

Electron Transfer,Atom Exchange,and Transformation of Iron Minerals in Soils;The Influence of Soil Organic Matter

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