Adsorption of phosphate on alumina and kaolinite from dilute aqueous solutions

Chen, Yi-Shon Richard; Butler, James N.; Stumm, Werner

doi:10.1016/0021-9797(73)90388-3

Cited by 103 publications

(61 citation statements)

References 32 publications

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“…The applicability of this result in describing adsorption of a single ligand has been confirmed by many researchers [21,22]. Considering adsorption to be a coordinative reaction of 1: 1 stoichiometry between concentration of adsorption sites and that of the where r is adsorption density (mol/g or mgig).…”

Section: Equilibrium Adsorptionmentioning

confidence: 54%

Adsorption of inorganic arsenic and organoarsenicals on hydrous oxides

1987

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Section: Equilibrium Adsorptionmentioning

confidence: 54%

Adsorption of inorganic arsenic and organoarsenicals on hydrous oxides

1987

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“…This prediction has been supported for pure iron oxides (Hingston et al 1967;Barrow et al 1980) but non-linear responses, which often have sorption plateaus between pH 4 and 6, have been reported for aluminum oxides (Chen et al 1973;He et al 1997). There is also some evidence that when pH effects do influence phosphate sorption, effects may be concentration dependent and absent under low solution phosphate concentrations (Eze and Loganathan 1990), which are typical of forest systems.…”

Section: Introductionmentioning

confidence: 63%

Leaf litter inputs decrease phosphate sorption in a strongly weathered tropical soil over two time scales

2012

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In strongly weathered soils, leaf litter not only returns phosphorus (P) to the soil environment, it may also modify soil properties and soil solution chemistry, with the potential to decrease phosphate sorption and increase plant available P. Using a radioactive phosphate tracer ( 32 P) and 1 h laboratory incubations we investigated the effect of litter inputs on phosphate sorption over two time scales: (1) long-term field litter manipulations (litter addition, control and litter removal) and (2) pulses of litter leachate (i.e. water extracts of leaf litter) from five species. Leachate pulse effects were compared to a simulated throughfall, which served as a control solution. Soil receiving long-term doubling of leaf litter maintained five-fold more phosphate in solution than the litter removal soil. In addition to the quantity of phosphate sorbed, the field litter addition treatment decreased the strength of phosphate sorption, as evaluated through extraction of sorbed 32 P using a weakly acidic ammonium fluoride solution (Bray 1). In litter removal soil, leachate pulses significantly reduced phosphate sorption in comparison to the throughfall control for all five species evaluated. However, the ability of leachate pulses to reduce phosphate sorption decreased when soil had received field litter inputs. Across soils the effect of leachate pulses on phosphate sorption increased with net sorption of dissolved organic C, with the exception of leachate from one species that had a higher index of aromatic C concentration. These results demonstrate that litter inputs, as both long-term inputs and short-term leachate pulses, can decrease the quantity and strength of phosphate sorption, which may increase the biological availability of this key nutrient.

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“…Phosphate adsorption reached a maximum at pH 5 and declined abruptly at both higher and lower solution pH. Other investigations have reported P adsorption envelopes on kaolinite of a parabolic shape similar to As(V) with P adsorption maxima between pH 4 and 6 (Chen et al, 1973a;Edzwald et al 1976). We did not measure simultaneous P adsorption in experiments with 0.67 ~ P + 0.67 ixM As(V) due to extremely low P concentrations (<0.3 paV/P) in sample solutions that were below the conductivity detection limit using ion chromatography.…”

Section: Resultsmentioning

confidence: 88%

“…Attempts to elucidate the mechanisms of oxyanion adsorption on clay minerals have included studies on the effects of competing anions and chemical modeling~ Phosphate (P) adsorption on kaolinite, montmorillonite and illite is insensitive to the presence of both SO42 and C1- (Edzwald et at. 1976), whereas organic anions decrease the adsorption of P (Chen et at. 1973a) and As(V) (Xu et al 1988) on kaolinite.…”

Section: Manning and Goldbergmentioning

confidence: 99%

Modeling Arsenate Competitive Adsorption on Kaolinite, Montmorillonite and Illite

Manning

Goldberg

1996

Clays and clay miner.

260

127

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Abstract--The adsorption of arsenate (As(V)) on kaolinite, montmorillonite and illite was investigated at varying pH and competing anion concentration while holding As(V) concentration (6.7 x 10 7 M), clay suspension density (2.5 g L 1) and ionic strength (0.1 M NaC1) constant. The effects of 2 concentrations of phosphate (P) or molybdate (Mo) (6.7 X 10 -7 and 6.7 x 10 6 M) on As(V) adsorption envelopes (adsorption vs. pH) gave evidence for direct competitive adsorption (in the case of As(V) + P) and possibly site-specific non-competitive adsorption (As(V) + Mo). Distinct As(V) adsorption maxima occurred at approximately pH 5.0 for kaolinite, 6.0 for montmorillonite and 6.5 for illite, and ranged from 0.15 to 0.22 mmol As(V) kg -1. When both As(V) and P were present at equimolar concentrations (6.7 X 10 -7 M), As(V) adsorption decreased slightly, whereas As(V) adsorption substantially decreased in binary As(V)/P systems when the P concentration was 6.7 X 10 -6 M, which was 10 times greater than As(V). The presence of Mo at equimolar (6.7 X 10 7 M) and 10 times greater (6.7 x 10 6 M) concentrations than As(V) caused only slight decreases in As(V) adsorption because the Mo adsorption maximum occurred at pH < 4. The constant capacitance surface complexation model was applied to As(V) and P adsorption data and was used to predict As(V) adsorption at varying P concentrations. The model gave reasonable descriptions of As(V) adsorption on the 3 clay minerals at varying pH and in the presence of a competing oxyanion (P), indicating that surface complexation modeling may be useful in predicting As(V) adsorption in soils.

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Adsorption of phosphate on alumina and kaolinite from dilute aqueous solutions

Cited by 103 publications

References 32 publications

Adsorption of inorganic arsenic and organoarsenicals on hydrous oxides

Adsorption of inorganic arsenic and organoarsenicals on hydrous oxides

Leaf litter inputs decrease phosphate sorption in a strongly weathered tropical soil over two time scales

Modeling Arsenate Competitive Adsorption on Kaolinite, Montmorillonite and Illite

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