Soluble Polymeric Hydroxy‐aluminium Ions in Acid Soils

Bache, B. W.; Sharp, George S.

doi:10.1111/j.1365-2389.1976.tb01987.x

Cited by 52 publications

(17 citation statements)

References 10 publications

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“…Turner (1967) suggested that the exchangeable fraction could include polymeric hydroxy-Al. This was confirmed by subsequent studies using clay (Hodges and Zelazny, 1983a) and soil systems (Bache and Sharp, 1976b), which found both monomeric and polymeric Al in the exchangeable fraction. Previously, Hsu and Rich (1960) had proposed that non-exchangeable Al 'fixed' by cation exchangers was a cyclic polymer with the formula [Al6(OH)i2) 6+ ].…”

Section: Al Complexed By Soil Organic Mattersupporting

confidence: 71%

“…Bache and Sharp (1976b) found some polymeric Al in their KCl extracts, but the soils they used were less acidic than those used by Lee et al Other evidence (McLean et al, 1964) suggested that hydroxyl Al ions remain exchangeable with K + until they have polymerized. Nair and Prenzel (1978) indicated that at millimolar concentrations of Al, Al 3+ could be expected to the dominant species up to pH 4 depending on the equilibrium constant values used for the various species of Al.…”

Section: Soonmentioning

confidence: 90%

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Fractionation of extractable aluminum in acid soils: A review and a proposed procedure

Soon¹

1993

Communications in Soil Science and Plant Analysis

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Different forms of soil aluminum (Al) are involved in the retention of anions and cations, phytotoxicity of Al in acid soils, CEC reduction and soil physical properties such as aggregate stability and water infiltration. Therefore it is desirable to quantify the different forms of Al in soil especially acidic soils. A rationale was developed from a literature survey to identify the following fractions of Al: (a) exchangeable quantified by 1M KC1 extraction; (b) organic bound quantified by 0.1M CuCl 2 + 0.5M KC1 extraction; (c) sorhed Al extractable with 1M NE 4 OAc at pH 4.0; (d) amorphous Al oxide and hydroxide and amorphous aluminosilicates (if present) extractable with 0.2M ammonium oxalate at pH 3.0; and (e) interlayered Al extractable with 0. 33M sodium citrate at pH 7.3. Pools (a), (b), and (c) are extracted sequentially. Amorphous Al oxide and hydroxide (pool d) is calculated from ammonium oxalate extractable Al minus (a + b + c). Interlayered Al is calculated from sodium citrate extractable Al minus ammonium oxalate extractable Al. The latter two extractions are done on separate subsamples of soils. From preliminary studies and data for 13 soil samples it is suggested that this fractionation of soil Al is more meaningful than that obtained by the KC1 -> K 4 P 2 O 7 -> ammonium oxalate > citrate-bicarbonate-dithionite extraction sequence. INTRODUCTIONAluminum is the most abundant metallic element in the earth's crust and soils. In soils most of the Al is tied up in the crystal lattice of alumino-silicate minerals. The remaining Al occurs in diverse forms, consequently its chemistry is complex.

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Section: Al Complexed By Soil Organic Mattersupporting

confidence: 71%

Section: Soonmentioning

confidence: 90%

Fractionation of extractable aluminum in acid soils: A review and a proposed procedure

Soon¹

1993

Communications in Soil Science and Plant Analysis

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“…The reaction was thus suggested by these authors to involve chemical bonding with surface hydroxyls. McLean (1965) and Shen and Rich (1962) believed that adsorbed Al-p were nonexchangeable with neutral salts, however, their results contradict those of Bache and Sharp (1976), who found that Al-p behaved like normal exchangeable cations. Frink and Peech (1963) indicated little, if any, reduction of CEC by hydroxy-Al treatment.…”

Section: Introductioncontrasting

confidence: 51%

Adsorption of Hydroxy-Al Polycations and Destabilization of Illite and Montmorillonite Suspensions

Doner

1990

Clays and clay miner.

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Abstract--Water-infiltration characteristics of soil can be improved by preventing clay dispersion. The present study determined the adsorption properties of hydroxy-AI polycations (Al-p) and their relation to the destabilization of clay suspensions. AI-p was synthesized and fractionated into nominal molecular weights between 104 and 5 x 104. The reactions of Al-p with Na-illite and Na-montmorillonite indicated a very strong affinity of Al-p to the clay surfaces. The maximum adsorptions of Al-p by Na-illite and Na-montmorillonite were found to be 0.37 and 1.7 mmole Al/g, and very close to the cation-exchange capacity of the two clays, suggesting that the adsorption was chiefly controlled by the mechanism of charge screening. Adsorption of Al-p increased the points of zero charge (PZCs) and the apparent points of zero salt effect (PZSEs) of illite and montmorillonite. PZSEs for both clays were 4.7 at their maximum Al-p adsorption, and PZCs ranged from 5.3 to 6.4, depending on solution ionic strength and the individual clay minerals. The differences in PZCs were probably due to outer-spbere complex formation between Al-p-treated illite and montmorillonite and the swamping electrolyte. Critical flocculation concentrations (CFCs) of Al-p for Na-illite and Na-montmorillonite were at 0.28 and 1.0 mmole Al/g, whereas zero electrophoretic mobilities were at about 0.36 and 1.67 mmole A1/g Al-p additions. Excessive addition of Al-p reversed this surface charge of clay colloids and restabilized the illite but not montmorillonite suspensions. This difference was probably due to the stronger and more extensive interparticle bridging of montmorillonite particles by Al-p than those of illite. The CFCs for the two clays were also found to be dependent on sodium adsorption ratio (SAR), pH, and ionic strength. Increases in SAR and pH significantly increased the CFC, whereas an increase in ionic strength decreased the CFC.

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“…The soils with high P status had slightly higher soil pHs. There were, however, major differences in A1 solubility between higher (limed) and lower (unlimed) soil pH treatments since this soil has more than a 20-fold increase in total soluble AI concentration between pH 5.2 and 4.0 (Bache and Sharp, 1976). The differences in P status were pronounced between treatments with PI treatments of low-to low-medium P status and P2 treatments of high P status (Anonymous, 1985).…”

Section: Soil Propertiesmentioning

confidence: 99%

Top and root growth and nutrient absorption of Prunus avium L. at two soil pH and P levels

Neilsen

Atkinson³

1990

Plant Soil

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One-year-old Prunus avium L. were grown under greenhouse conditions in a Countesswells soil in all combinations of 2 pH and 2 P levels. The soil, obtained from a long-term liming and fertilizer experiment, provided pH values throughout the experiment of 3.75-3.99 (pH 1) and 4.81-5.41 (pH 2). The P treatments had 0.43% acetic acid extractable P of 31-44 #g g-~ (P1) and 145-173/~g g-~ (P2). The trees were harvested 92 (HI), 134 (H2), and 168 (H3) days after initiation of growth.Top (leaf + new stem) dry weight was significantly increased for pH 2 and P2 at H2 and H3. P2 also increased leaf weight (H 1), the weight of the original stem-root (H2 and H3), and root length but decreased root diameter at both soil pHs (H2 and H3). Total tree uptake of N, P, K, Ca, and Mg was also increased by pH-P combinations which had significantly greater dry matter production and root length. Total Mn uptake decreased at pH2. Root nutrient inflows (uM m-~ day-~ ) were increased for Ca at pH2 and for P at P2. Mn inflow decreased at pH2 and at pHI P2 although the increased root length associated with the latter treatment resulted in increased total tree Mn uptake. In general, high nutrient inflows occurred in all trees at H1 and in severely stunted trees at pill P1; both had larger than average root diameters.

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Soluble Polymeric Hydroxy‐aluminium Ions in Acid Soils

Cited by 52 publications

References 10 publications

Fractionation of extractable aluminum in acid soils: A review and a proposed procedure

Fractionation of extractable aluminum in acid soils: A review and a proposed procedure

Adsorption of Hydroxy-Al Polycations and Destabilization of Illite and Montmorillonite Suspensions

Top and root growth and nutrient absorption of Prunus avium L. at two soil pH and P levels

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