Ligand exchange of oxyanions on synthetic hydrated oxides of iron and aluminum

Okazaki, Masanori; Sakaidani, Koichi; Saigusa, Toshiya; Sakaida, Nako

doi:10.1080/00380768.1989.10434767

Cited by 25 publications

(9 citation statements)

References 17 publications

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“…The release of Downloaded by [University of Glasgow] at 16:55 22 December 2014 OH" accompanied with selenite sorption on allophane clay was larger than that by phosphate sorption (Rajan and Watkinson, 1976). A similar phenomena has been reported for synthetic hydrated oxides of Fe and Al (Okazaki et al, 1989). However, proton consumption with selenite sorption was obviously smaller than that with phosphate and fluoride sorption.…”

Section: Selenitesupporting

confidence: 58%

“…For example, Parfitt (1978) suggested that fluoride adsorption by clay minerals involved ligand exchange with coordinated OH groups. Okazaki et al (1989) showed that selenite and phosphate sorption released OH and H2O from synthetic hydrated oxides of iron (Fe) and aluminum (Al). However, selenite, fluoride, and phosphate sorption mechanisms on real soils would be extremely complex and not fully revealed.…”

Section: Introductionmentioning

confidence: 99%

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Proton consumption and release of organic‐cabon, silicate, and sulfate by anion sorption on andosols

Saeki

Matsumoto

1993

Communications in Soil Science and Plant Analysis

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S:Three anion (selenite, phosphate, and fluoride) sorption, and the concomitant release of silicate, sulphate, and organic matters from soils, and proton consumption with sorption were investigated using two andosols in Japan.The following sequence of sorption by the andosols was, fluoride (F) >> phosphate (P) > selenite (Se); concomitant proton consumption with sorption, F >> P > Se; organic matter released, P > Se > F; and sulfate released, P > Se >> F. There was quite a difference between an allophanic and a non-allophanic andosols in silicate released with anion sorption. Our results suggest that the fluoride sorption mechanism is different from the others and that surface sites with OH groups for inner-sphere complexes with selenite on soil particles which are restricted as compared to phosphate and fluoride.

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Section: Selenitesupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Proton consumption and release of organic‐cabon, silicate, and sulfate by anion sorption on andosols

Saeki

Matsumoto

1993

Communications in Soil Science and Plant Analysis

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“…These tendencies have been shown by Hingston et al. (1972), Balistrieri and Chao (1987) and Okazaki et al (1989). Because Mn minerals (McKenzie, 1972) and Si minerals (Sposito, 1989) have low PZC values, comparing to Fe and Al oxides (Sposito, 1989), it was anticipated that these minerals could not almost adsorb selenite ions in normal pH range (pH<4).…”

Section: Preparation Of Oxides and Humic Acidsmentioning

confidence: 74%

“…Under pH 3 selenite fixation by the hy.Alox was very low. It is supposed that the particle adsorbing selenite ions would be broken by strong acidity (Okazaki et al, 1989), dissolving Alselenite complexes into solution. In the other minerals in Figure 1 adsorption is dependent on pH.…”

Section: Preparation Of Oxides and Humic Acidsmentioning

confidence: 99%

Selenite adsorption by a variety of oxides

Saeki

Matsumoto

1994

Communications in Soil Science and Plant Analysis

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S:Selenite adsorption by a variety of oxides consisting of iron (Fe), aluminum (Al), titanium (Ti), manganes (Mn), and silicon (Si), and by two humic acids were investigated in order to grasp selenite behavior and fixation mechanisms in soil. It was found that selenite was apparently adsorbed even by the Mn oxides on which surface negative charge was dominant in normal pH range (pH <4). No selenite adsorption was observed in the silicon dioxide (SiO 2 ) and the two humic acids. A sequential extraction of adsorbed selenite with competitive anions showed the differences of binding force or stability of adsorbed selenite among the minerals. While the goethite fixed selenite strongly, selenite adsorbed on the Mn oxide was easily released to the liquid phase with other anions, such as phosphate. Each mineral had its inherent characteristic in ligand exchange reactions accompanied with selenite sorption. Selenite sorption by the Mn and the Ti oxides resulted in large increase of surface negative charge, while only a little increase in the Fe and Al oxides. Proton consumption with selenite sorption was extremely smaller for the Mn oxide than for the others.

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“…Amorphous iron‐(hydr)oxide was synthesized from a 0.1 mol L −1 Fe(NO 3 ) 3 ·9H 2 O solution by the addition of 1 mol L −1 NaOH at room temperature until the pH of the solution reached 7.0. The mixture was allowed to stand for 4 h and then filtered (Okazaki et al . 1989).…”

Section: Methodsmentioning

confidence: 99%

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

Ultra

Nakayama

Tanaka

et al. 2009

Soil Science and Plant Nutrition

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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.

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Ligand exchange of oxyanions on synthetic hydrated oxides of iron and aluminum

Cited by 25 publications

References 17 publications

Proton consumption and release of organic‐cabon, silicate, and sulfate by anion sorption on andosols

Proton consumption and release of organic‐cabon, silicate, and sulfate by anion sorption on andosols

Selenite adsorption by a variety of oxides

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

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