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- W1495003239 abstract "Allophane, a short-range ordered aluminosilicate with reactive aluminol groups has an important role in reaction with organic compounds in volcanic ash soils. Adsorption of low molecular weight organic compounds (acetate, oxalate and citrate) on allophane showed that oxalate has the highest affinity among the three for allophane at lower pH (4–5). At higher pH (6–9), however, citrate adsorption was highest among the three organic compounds. For all organic compounds, the amount of adsorption on allophane increased with decreasing pH. Increase in solution pH with adsorption was observed in most cases, indicating dehydroxylation reaction via ligand exchange. On the contrary, a decrease in pH after acetate and citrate adsorption at lower pH was observed due to reaction between Al-OH 2 + and COOH. Oxalate and citrate are possibly adsorbed in bidentate and/or binuclear form, but molecular orbital calculation indicated that the binuclear form is more stable for oxalate and the bidentate form is more stable for citrate. These results have an important implication in study on pedogenesis, soil fertility and environmental chemistry." @default.
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- W1495003239 date "2002-01-01" @default.
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- W1495003239 title "Reactions of some short-range ordered aluminosilicates with selected organic ligands" @default.
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- W1495003239 doi "https://doi.org/10.1016/s0166-2481(02)80060-5" @default.
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