Boron Fixation by Illites

Couch, Elton L.

doi:10.1346/ccmn.1968.0160307

Cited by 101 publications

(39 citation statements)

References 17 publications

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“…This suggests, in accordance with Couch and Grim (1968) and , that boron is adsorbed on the clay edges rather than on the planar surfaces. The difference in boron adsorption between the Na and Ca forms of the two clays is discussed below.…”

Section: Resultssupporting

confidence: 81%

“…Such specific ad-1 Journal article 856, Agricultural Experiment Station, New Mexico State University, Las Cruces, New Mexico 88003. sorption can occur independent of the sign of the net surface charge (Hingston et al, 1972) and involves the boron species B(OH)3 and B(OH)4-. Several investigators (Couch and Grim, 1968;Bingham and Page, 1971; suggested that most of the boron adsorption sites were located on broken edges of the clay particles. Thus, the magnitude of boron adsorption on montmorillonite and illite should be similar regardless of the exchangeable ions, because the surface area of the broken edges of both clays is essentially the same.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Exchangeable Ions and Ionic Strength on Boron Adsorption by Montmorillonite and Illite

Keren

1982

Clays and clay miner.

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Abstract--The effects of exchangeable Na and Ca and the ionic strength of NaC1 and CaC12 solutions on the boron adsorption by the Na and Ca forms of montmorillonite and illite at pH 9 were studied. The boron adsorption by montmorillonite was greater for the Ca form than for the Na form at any boron activity in solution and at any ionic strength. For example, the amount of boron adsorbed by Na-and Ca-montmorillonite was 2.9 and 4.3/zmole/g, respectively, at an ionic strength of 0.36 and a boron activity of 0.875 mmole/liter in equilibrium solution. The boron adsorption by illite was much greater than by montmorillonite. For example, the amount of boron adsorbed by Na-montmorillonite and Na-illite was 1.5 and 8.7 /zmole/g, respectively, at an ionic strength of 0.02 and a boron activity of 0.5 mmole/liter. However, the nature of the exchangeable cation had little effect on the boron adsorption by illite. The effect of the ionic strength on the boron adsorption by Na-montmorillonite was greater than that observed for either Camontmorillonite or illite. The data suggest that the negative electric field around the clay particles is one of the main factors controlling boron adsorption at alkaline pHs.

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Section: Resultssupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Effect of Exchangeable Ions and Ionic Strength on Boron Adsorption by Montmorillonite and Illite

Keren

1982

Clays and clay miner.

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“…Several investigators (Couch and Grim, 1968;Bingham and Page, 1971) suggested that most of the clay's i Contribution No. 231-E, 1980 series.…”

Section: Introductionmentioning

confidence: 99%

Boron Adsorption by Clay Minerals Using a Phenomenological Equation

Keren

1981

Clays and clay miner.

179

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Abstract--Boron adsorption by Ca forms of montmorillonite, illite, and kaolinite was determined as a function ofpH and boron concentration in solution. Data from batch experiments were compared with results computed for each clay according to fitted adsorption coefficients (maximum boron adsorption and affinity constants related to the binding energy). The agreement between calculated values and experimental results indicates that a phenomenological equation can be used to predict boron adsorption on clays as a function of both of these variables. For the solution-to-clay ratios examined, the water content does not affect the boron-surface interaction as expressed by the above adsorption parameters. Because the affinity of clays for B(OHL-is much stronger than for B(OH) 3 , the adsorption maximum was obtained only under alkaline conditions at approximately pH 9.0 to 9.7. It is suggested that the pH of maximum adsorption is a function of the ratios of affinity coefficients of the three species B(OH)3, B(OH)4-, and OH-competing for the same adsorption sites. The adsorption coefficients indicate that in some cases the difference in the amount of adsorbed boron between montmorillonite and kaolinite could be either small or large, depending on the circumstances. The main factor that would affect this difference is the total amount of boron in the suspension. Estimated value of the adsorption maximum was 2.94, 11.8 and 15.1/zmole/g for Ca-kaolinite, Ca-montmorillonite, and Ca-illite, respectively.

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“…Boron is retained in soils by adsorption onto mineral and humic particles and by forming insoluble precipitates (Couch and Grim 1968;Goldberg and Glaubig 1985;Evans 1987). The mobility, transport and partitioning of B in soils are dependent on various soil chemical properties that include soil pH, the type and contents of clay minerals, and the contents of Al and Fe oxides and (oxy)hydroxides, carbonates and organic matter .…”

mentioning

confidence: 99%