Iron Stable Isotopes in Bulk Soil and Sequential Extracted Fractions Trace Fe Redox Cycling in Paddy Soils

Yu Han Qi; Wenhan Cheng; Xiao Yun Nan; Fan Yang; Jianghanyang Li; De Cheng Li; Craig C. Lundstrom; Hui Min Yu; Gan Lin Zhang; Fang Huang

doi:10.1021/acs.jafc.0c02515

Iron Stable Isotopes in Bulk Soil and Sequential Extracted Fractions Trace Fe Redox Cycling in Paddy Soils

Yu Han Qi, Wenhan Cheng, Xiao Yun Nan, Fan Yang, Jianghanyang Li, De Cheng Li, Craig C. Lundstrom, Hui Min Yu, Gan Lin Zhang, Fang Huang

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

Abstract

In paddy soils, iron (Fe) forms are highly influenced by the seasonal redox changes and leave detectable isotope signals because of fractionation between different Fe forms. Here, we present Fe concentrations and Fe isotope compositions (expressed as δ56Fe values) in a paddy soil profile from Suzhou, China. Light Fe isotopes were enriched in two iron-accumulation layers (Br3 and G1) with high Fe concentrations. In particular, large shifts in both Fe concentrations and δ56Fe values were found at the Br2 and Br3 boundaries, showing fast and efficient transformation between these horizons. With sequential extraction, we show that Fe isotopes in the short-range-ordered Fe minerals and crystalline Fe oxides were lighter than those in the residual silicate minerals. Iron enriched in light isotopes was leached from the Ap horizon and subsequently moved to Br horizon, quickly precipitating there as Fe oxides.

Original language	English (US)
Pages (from-to)	8143-8150
Number of pages	8
Journal	Journal of Agricultural and Food Chemistry
Volume	68
Issue number	31
DOIs	https://doi.org/10.1021/acs.jafc.0c02515
State	Published - Aug 5 2020

Keywords

Fe cycling
Fe isotopes
paddy soil
redox variation
sequential extraction

ASJC Scopus subject areas

General Chemistry
General Agricultural and Biological Sciences

Online availability

10.1021/acs.jafc.0c02515

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title = "Iron Stable Isotopes in Bulk Soil and Sequential Extracted Fractions Trace Fe Redox Cycling in Paddy Soils",

abstract = "In paddy soils, iron (Fe) forms are highly influenced by the seasonal redox changes and leave detectable isotope signals because of fractionation between different Fe forms. Here, we present Fe concentrations and Fe isotope compositions (expressed as δ56Fe values) in a paddy soil profile from Suzhou, China. Light Fe isotopes were enriched in two iron-accumulation layers (Br3 and G1) with high Fe concentrations. In particular, large shifts in both Fe concentrations and δ56Fe values were found at the Br2 and Br3 boundaries, showing fast and efficient transformation between these horizons. With sequential extraction, we show that Fe isotopes in the short-range-ordered Fe minerals and crystalline Fe oxides were lighter than those in the residual silicate minerals. Iron enriched in light isotopes was leached from the Ap horizon and subsequently moved to Br horizon, quickly precipitating there as Fe oxides.",

keywords = "Fe cycling, Fe isotopes, paddy soil, redox variation, sequential extraction",

author = "Qi, {Yu Han} and Wenhan Cheng and Nan, {Xiao Yun} and Fan Yang and Jianghanyang Li and Li, {De Cheng} and Lundstrom, {Craig C.} and Yu, {Hui Min} and Zhang, {Gan Lin} and Fang Huang",

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doi = "10.1021/acs.jafc.0c02515",

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T1 - Iron Stable Isotopes in Bulk Soil and Sequential Extracted Fractions Trace Fe Redox Cycling in Paddy Soils

AU - Qi, Yu Han

AU - Cheng, Wenhan

AU - Nan, Xiao Yun

AU - Yang, Fan

AU - Li, Jianghanyang

AU - Li, De Cheng

AU - Lundstrom, Craig C.

AU - Yu, Hui Min

AU - Zhang, Gan Lin

AU - Huang, Fang

PY - 2020/8/5

Y1 - 2020/8/5

N2 - In paddy soils, iron (Fe) forms are highly influenced by the seasonal redox changes and leave detectable isotope signals because of fractionation between different Fe forms. Here, we present Fe concentrations and Fe isotope compositions (expressed as δ56Fe values) in a paddy soil profile from Suzhou, China. Light Fe isotopes were enriched in two iron-accumulation layers (Br3 and G1) with high Fe concentrations. In particular, large shifts in both Fe concentrations and δ56Fe values were found at the Br2 and Br3 boundaries, showing fast and efficient transformation between these horizons. With sequential extraction, we show that Fe isotopes in the short-range-ordered Fe minerals and crystalline Fe oxides were lighter than those in the residual silicate minerals. Iron enriched in light isotopes was leached from the Ap horizon and subsequently moved to Br horizon, quickly precipitating there as Fe oxides.

AB - In paddy soils, iron (Fe) forms are highly influenced by the seasonal redox changes and leave detectable isotope signals because of fractionation between different Fe forms. Here, we present Fe concentrations and Fe isotope compositions (expressed as δ56Fe values) in a paddy soil profile from Suzhou, China. Light Fe isotopes were enriched in two iron-accumulation layers (Br3 and G1) with high Fe concentrations. In particular, large shifts in both Fe concentrations and δ56Fe values were found at the Br2 and Br3 boundaries, showing fast and efficient transformation between these horizons. With sequential extraction, we show that Fe isotopes in the short-range-ordered Fe minerals and crystalline Fe oxides were lighter than those in the residual silicate minerals. Iron enriched in light isotopes was leached from the Ap horizon and subsequently moved to Br horizon, quickly precipitating there as Fe oxides.

KW - Fe cycling

KW - Fe isotopes

KW - paddy soil

KW - redox variation

KW - sequential extraction

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U2 - 10.1021/acs.jafc.0c02515

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JO - Journal of Agricultural and Food Chemistry

JF - Journal of Agricultural and Food Chemistry

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Iron Stable Isotopes in Bulk Soil and Sequential Extracted Fractions Trace Fe Redox Cycling in Paddy Soils

Abstract

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