Ionic Factors Affecting Aluminum Transformations and the Impact on Soil and Environmental Sciences

Huang, P. M.

doi:10.1007/978-1-4613-8771-8_1

Cited by 59 publications

(37 citation statements)

References 203 publications

(286 reference statements)

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“…Dahlgren and Walker (1993) obtained a slope of about 2.7 for several Spodosol Bs horizons, compared to a theoretical value of 3.0 for an Al(OH) 3 phase. A slope less than 3.0 may indicate that the formula for the hydroxy-Al polymer is Al(OH) 2.7 0.3+ , the positive charge satisfying the negative charge of the 2:1 layer silicate hosting the interlayer material (Huang, 1988). As for allophanic Andosol A horizons, Takahashi et al (1995) observed a slope of 2.9, which was very close to the value expected for an Al(OH) 3 phase ( Fig.…”

Section: Organic Carbon Accumulation In Andosolssupporting

confidence: 60%

Nature, properties and function of aluminum–humus complexes in volcanic soils

2016

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Andosols (or Andisols) possess several distinctive properties that are rarely found in other groups of soils. These properties are largely due to the dominance of short-range-ordered minerals (allophane, imogolite and ferrihydrite) and/or metal-humus complexes (Al/Fe-humus complexes) in their colloidal fraction. While several papers have extensively reviewed the nature and properties of short-range-ordered minerals, there is no comprehensive review of the genesis, characteristics and management implications of Al-humus complexes, the dominant form of active Al in non-allophanic Andosols. In this review, we survey the chemical characteristics of Al-humus complexes and discuss the pedogenic environment favoring their formation in non-allophanic Andosols. The role of Al-humus complexes in carbon cycling and soil organic carbon accumulation is emphasized as an important mechanism controlling organic dynamics in Andosols. While non-allophanic Andosols share many common properties with allophanic Andosols, they display several distinct characteristics associated with Al-humus complexes, such as strong acidity and high exchangeable Al content that impair agricultural productivity due to Al phytotoxicity. Thus, we focus on the role of Al-humus complexes in regulating aqueous Al 3+ solubility and release/retention kinetics, Al phytotoxicity, phosphorus dynamics, and suppression of soil-borne diseases. Knowledge of these soil properties as related to Al-humus complexes is necessary to develop effective soil management practices to assure sustainable agricultural productivity in non-allophanic Andosols. Finally, future research needs are identified concerning the role of Al-humus complexes in regulating soil biogeochemical processes.

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Section: Organic Carbon Accumulation In Andosolssupporting

confidence: 60%

Nature, properties and function of aluminum–humus complexes in volcanic soils

2016

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“…Hydroxy-A1 interlayers in expandable layer silicates are noted for their importance in affecting the availability and dynamics of plant nutrients and pollutants in acidic environments (Huang, 1988;Barnhisel and Bertsch, 1989) and for their application in industrial catalysis (Pinnavaia, 1983) due to the high surface reactivity of the interlayer materials. The modifications in surface properties of the hydroxy-A1 interlayers upon silication, thus, deserve future study.…”

Section: Discussionmentioning

confidence: 99%

Silication of Hydroxy-Al Interlayers in Smectite

Lou

1993

Clays and clay miner.

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Abstract--The reaction of hydroxy-A1 interlayers in montmorillonite with monosilicic acid was studied by chemical analysis, X-ray diffractometry (XRD), and Fourier-transform infrared (FTIR) spectroscopy. Hydroxy-A1 interlayers in montmorillonite was prepared by treating Ca-montmorillonite (< 2/~m) with hydroxy-Al solutions at an initial A1 concentration of 0.5 mM and OH/A1 molar ratios of 1.0, 2.0, and 2.5. The resultant partially intedayered montmorillonite was reacted with 0.5, 0.9, and 1.4 mM monosilicic acid solutions.A substantial amount of monosilicic acid was adsorbed by the interlayer hydroxy-A1 polymers through the reaction of Si-OH groups with mainly A1-OH groups, resulting in the formation of silicated A1-interlayers with Si/A1 molar ratios up to 0.19. The adsorption of silicic acid by interlayer hydroxy-A1 polymers increased the basal spacings of the partially interlayered montmorillonite. This effect was most pronounced for the hydroxy-A1 interlayered montmorillonite formed in the systems at an OH/AI ratio of 2.0, in which the d(001) reflections (110~ shifted from 13.6 /~ before silication to 14.1 /k with a shoulder at 17.0 A after silication. The differential IR spectrum of the silicated hydroxy-Al interlayers in montmorillonite exhibited absorption bands at 935 and 3730 cm -t , which can be assigned to Si-O and Si-OH, respectively, of the adsorbed Si(OH)4. An interlayer structure analogous to that of "proto-imogolite" was, thus, proposed for the silicated interlayer hydroxy-Al polymers in montmorillonite. This study revealed a new mechanism through which Si enters the interlayer spaces of smectite. The silication of hydroxy-Al-interlayered clays in natural environments and the related modifications in surface properties of the clays should receive increasing attention.

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“…The hydrolytic reactions of Al are affected to varying degrees by pH, temperature, aging, and the nature and concentration of counter anions and clay minerals (Hsu and Bates, 1964;Violante andViolante, 1978, 1980;Kodama and Schnitzer, 1980;Huang, 1975, 1979;Violante andJackson, 1979, 1981;Huang and Violante, 1986;Huang, 1988;Hsu, 1989). Critical amounts of anions with different structures, functional groups, molecular weight, and chelating power toward A1 ions lead to the formation of noncrystalline or poorly crystalline A1 precipitation products (pseudoboehmite), which do not change into AI(OH)3 polymorphs for many months (Violante and Violante, 1980;Violante and Jackson, 1981;Violante and Huang, 1984, 1985Violante, 1985).…”

Section: Introductionmentioning

confidence: 99%

Effect of Prolonged Aging on the Transformation of Short-Range Ordered Aluminum Precipitation Products Formed in the Presence of Organic and Inorganic Ligands

Violante

Gianfreda

Violante

1993

Clays and clay miner.

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Abstract--More than 40 samples of A1 precipitation products formed in the presence of organic (aspartic, oxalic, citric, tartaric, malic, salicylic, and tannic acid, and acetylacetone) and inorganic (chloride, sulfate and phosphate) ligands, which were short-range-ordered materials after 2-5 months of aging, were analyzed by X-ray diffraction (XRD), infrared spectroscopy (IR), and transmission electron microscopic (TEM) examination after prolonged periods of aging in the mother liquids (from 7-15 years). Noncrystalline materials were found after 7-10 years of aging in samples formed in the presence of citrate, tartrate, and tannate at pH -< 8.0 and at ligand/A1 molar ratios (R) ranging from 0.05-0.1; they were found as well in the presence of phosphate and malate at ligand/Al molar ratios from 0.1-0.5. Poorly crystalline AIoxyhydroxides (pseudoboehmite) without AI(OH)3 polymorphs were found in solutions with a wide range ofpH (from 6.0-11.0) in the presence of tartrate, citrate, tannate, malate, salicylate, sulfate, and phosphate after 7-15 years. The crystallinity of these samples was indeed very poor. On the contrary, gibbsite formation was observed in samples formed at pH 7.0 or 8.0 in the presence of oxalate (R = 0.1 or 1.0), aspartate (R = 0.1 and 0.5), malate (R = 0.03 or 0.17), salicylate (R = 0.05), and in samples containing very high concentrations of chloride (R = 700 or 1000). Finally, the formation ofgibbsite was promoted in the presence of montmorillonite, but some samples at pH -< 6.0 in the presence of citrate (R = 0.1), tartrate (R = 0.1), or tannate (R = 0.02 or 0.1) showed after 6 years of aging interstratification of OH-A1 species in the interlayers of the clay mineral and complete lack of AI(OH)3 polymorphs.

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Ionic Factors Affecting Aluminum Transformations and the Impact on Soil and Environmental Sciences

Cited by 59 publications

References 203 publications

Nature, properties and function of aluminum–humus complexes in volcanic soils

Nature, properties and function of aluminum–humus complexes in volcanic soils

Silication of Hydroxy-Al Interlayers in Smectite

Effect of Prolonged Aging on the Transformation of Short-Range Ordered Aluminum Precipitation Products Formed in the Presence of Organic and Inorganic Ligands

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