Potential for the alleviation of arsenic toxicity in paddy rice using amorphous iron-(hydr)oxide amendments

V.U. Ultra Jr., A. Nakayama, S. Tanaka, Y. Kang, K. Sakurai, K. Iwasaki

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

A pot culture experiment was conducted to investigate the effects of amorphous iron-(hydr)oxide (Am-FeOH) amendments on arsenic (As) availability and its uptake by rice (Oryza sativa L. cv. BR28) irrigated with As-contaminated water. A rhizobag system was established using 3.5 L plastic pots, each containing one central compartment for plant growth, a middle compartment and an outside compartment. Three levels of laboratory-synthesized Am-FeOH (0, 0.1 and 0.5% w/w) were used to amend samples of the As-free sandy loam paddy soil placed into each compartment of the rhizobag system. The soils were submerged with a solution containing 5 mg L-1 As(V). Two-week-old rice seedlings were planted in the central compartments and cultured for 9 weeks under greenhouse conditions. The addition of 0.1% Am-FeOH to the soil irrigated with As-contaminated water improved plant growth, reduced the As concentration in the plants and enhanced Fe-plaque formation on the root surfaces. Analysis of soil solution samples collected during the experiment revealed higher pH levels and lower redox potentials in the soils amended with Am-FeOH at the onset of soil submergence, but later the soil solution collected from the 0.1% Am-FeOH treatment was slightly acidic and more oxidized than the solution from the 0% treatment. This indicated active functioning of the roots in the soil treated with 0.1% Am-FeOH. The concentrations of As(III) in the soil solution collected from the central compartment were significantly reduced by the Am-FeOH amendments, whereas in the soil treated with 0% Fe, As(III) accumulated in the rhizosphere, particularly during the late-cultivation period. The improvement in plant growth and reduction in As uptake by plants growing in the Am-FeOH treated soil could be attributed to the reduction of available As in the soil solution, mainly as a result of the binding of As to the Fe-plaque on the root surfaces. © 2009 Japanese Society of Soil Science and Plant Nutrition.
Original languageEnglish
Pages (from-to)160-169
Number of pages10
JournalSoil Science and Plant Nutrition
Volume55
Issue number1
DOIs
Publication statusPublished - 2009

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iron oxides
arsenic
iron oxide
rice
toxicity
soil
soil solution
plant growth
uptake mechanisms
irrigated soils
pot culture
paddy soils
submergence
soil amendments
soil science
loam soils
redox potential
plant nutrition
sandy loam
rhizosphere

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Ultra Jr., V.U. ; Nakayama, A. ; Tanaka, S. ; Kang, Y. ; Sakurai, K. ; Iwasaki, K. / Potential for the alleviation of arsenic toxicity in paddy rice using amorphous iron-(hydr)oxide amendments. In: Soil Science and Plant Nutrition. 2009 ; Vol. 55, No. 1. pp. 160-169.
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abstract = "A pot culture experiment was conducted to investigate the effects of amorphous iron-(hydr)oxide (Am-FeOH) amendments on arsenic (As) availability and its uptake by rice (Oryza sativa L. cv. BR28) irrigated with As-contaminated water. A rhizobag system was established using 3.5 L plastic pots, each containing one central compartment for plant growth, a middle compartment and an outside compartment. Three levels of laboratory-synthesized Am-FeOH (0, 0.1 and 0.5{\%} w/w) were used to amend samples of the As-free sandy loam paddy soil placed into each compartment of the rhizobag system. The soils were submerged with a solution containing 5 mg L-1 As(V). Two-week-old rice seedlings were planted in the central compartments and cultured for 9 weeks under greenhouse conditions. The addition of 0.1{\%} Am-FeOH to the soil irrigated with As-contaminated water improved plant growth, reduced the As concentration in the plants and enhanced Fe-plaque formation on the root surfaces. Analysis of soil solution samples collected during the experiment revealed higher pH levels and lower redox potentials in the soils amended with Am-FeOH at the onset of soil submergence, but later the soil solution collected from the 0.1{\%} Am-FeOH treatment was slightly acidic and more oxidized than the solution from the 0{\%} treatment. This indicated active functioning of the roots in the soil treated with 0.1{\%} Am-FeOH. The concentrations of As(III) in the soil solution collected from the central compartment were significantly reduced by the Am-FeOH amendments, whereas in the soil treated with 0{\%} Fe, As(III) accumulated in the rhizosphere, particularly during the late-cultivation period. The improvement in plant growth and reduction in As uptake by plants growing in the Am-FeOH treated soil could be attributed to the reduction of available As in the soil solution, mainly as a result of the binding of As to the Fe-plaque on the root surfaces. {\circledC} 2009 Japanese Society of Soil Science and Plant Nutrition.",
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Potential for the alleviation of arsenic toxicity in paddy rice using amorphous iron-(hydr)oxide amendments. / Ultra Jr., V.U.; Nakayama, A.; Tanaka, S.; Kang, Y.; Sakurai, K.; Iwasaki, K.

In: Soil Science and Plant Nutrition, Vol. 55, No. 1, 2009, p. 160-169.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Potential for the alleviation of arsenic toxicity in paddy rice using amorphous iron-(hydr)oxide amendments

AU - Ultra Jr., V.U.

AU - Nakayama, A.

AU - Tanaka, S.

AU - Kang, Y.

AU - Sakurai, K.

AU - Iwasaki, K.

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PY - 2009

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AB - A pot culture experiment was conducted to investigate the effects of amorphous iron-(hydr)oxide (Am-FeOH) amendments on arsenic (As) availability and its uptake by rice (Oryza sativa L. cv. BR28) irrigated with As-contaminated water. A rhizobag system was established using 3.5 L plastic pots, each containing one central compartment for plant growth, a middle compartment and an outside compartment. Three levels of laboratory-synthesized Am-FeOH (0, 0.1 and 0.5% w/w) were used to amend samples of the As-free sandy loam paddy soil placed into each compartment of the rhizobag system. The soils were submerged with a solution containing 5 mg L-1 As(V). Two-week-old rice seedlings were planted in the central compartments and cultured for 9 weeks under greenhouse conditions. The addition of 0.1% Am-FeOH to the soil irrigated with As-contaminated water improved plant growth, reduced the As concentration in the plants and enhanced Fe-plaque formation on the root surfaces. Analysis of soil solution samples collected during the experiment revealed higher pH levels and lower redox potentials in the soils amended with Am-FeOH at the onset of soil submergence, but later the soil solution collected from the 0.1% Am-FeOH treatment was slightly acidic and more oxidized than the solution from the 0% treatment. This indicated active functioning of the roots in the soil treated with 0.1% Am-FeOH. The concentrations of As(III) in the soil solution collected from the central compartment were significantly reduced by the Am-FeOH amendments, whereas in the soil treated with 0% Fe, As(III) accumulated in the rhizosphere, particularly during the late-cultivation period. The improvement in plant growth and reduction in As uptake by plants growing in the Am-FeOH treated soil could be attributed to the reduction of available As in the soil solution, mainly as a result of the binding of As to the Fe-plaque on the root surfaces. © 2009 Japanese Society of Soil Science and Plant Nutrition.

U2 - 10.1111/j.1747-0765.2008.00341.x

DO - 10.1111/j.1747-0765.2008.00341.x

M3 - Article

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