Predicting aqueous aluminium concentrations in natural waters

Cronan, Christopher S.; Walker, William J.; Bloom, Paul R.

doi:10.1038/324140a0

Cited by 307 publications

(125 citation statements)

References 18 publications

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“…This enhanced dissolution of gibbsite (and by analogy, other aluminum-containing minerals) may contribute to the high Al concentrations observed in natural waters (2,21,22) that receive input of acid sulfate waters, such as acid rain and acid mine effluents. Although the residence time of these waters is insufficient for them to attain equilibrium with the solid phase, this study suggests that high concentrations of dissolved Al are possibly due to the enhanced dissolution kinetics.…”

Section: Resultsmentioning

confidence: 99%

“…Clearly these solutions are still very undersaturated. Previous studies have suggested a slow equilibration rate for gibbsite dissolution in acidic, lowtemperature solutions (19,20), and few natural low-temperature environments reach equilibrium (2,21,22). An initial difference in the concentration of dissolved Al 3+ (at time zero) is apparent from Figure 1, this difference may result partially from the incomplete removal of all starting solution during the initial rinsing.…”

Section: Resultsmentioning

confidence: 99%

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Effect of Sulfate on the Release Rate of Al³⁺ from Gibbsite in Low-Temperature Acidic Waters

Ridley

Wesolowski

Palmer

et al. 1997

Environ. Sci. Technol.

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Solubility experiments were performed at 5°C by reacting 1 g of powdered gibbsite with 45 g of aqueous H 2 SO 4 -NaCl and HCl-NaCl (0.01 m H + ) solutions at 0.1 m ionic strength. The kinetics of dissolution were monitored under extremely undersaturated conditions and appeared to favor a zero-order rate-determining process. The dissolution rate of gibbsite in the sulfate solution was approximately 10 times faster than in the HCl solution, which is consistent with trends reported in the literature for studies performed at higher temperatures. The enhanced dissolution kinetics of gibbsite (and by analogy, other aluminum-containing minerals) in the presence of sulfate may contribute to the elevated Al concentrations observed in natural lowtemperature waters associated with acid rain and acid mine drainage.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effect of Sulfate on the Release Rate of Al³⁺ from Gibbsite in Low-Temperature Acidic Waters

Ridley

Wesolowski

Palmer

et al. 1997

Environ. Sci. Technol.

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“…These studies suggest that exchange of Al 3+ with humic substances (Al-humus complexes) controls the relationship between Al 3+ and H + . In this case, the degree of Al 3+ saturation of carboxyl groups on humic substances will determine the pAl versus pH solubility relationship (i.e., slope and intercept) (Cronan et al, 1986).…”

Section: Organic Carbon Accumulation In Andosolsmentioning

confidence: 99%

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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“…The original parameters should ®rst be selected before acidi®cation capacity is being calculated. They should have two characteristics: (1) their data over a large scale of area are conventionally determined and available; (2) there exist theoretical relations between these parameters (Cronan et al, 1986) if no measured data are available. The concentration of DOC may be estimated by COD (Li and Tang, 1997) and used in the following computation.…”

Section: Theoretical Computation Approaches Of Acidification Capacitymentioning

confidence: 99%

“…Generally, the concentration of dissolved aluminum in a large scale of area can not be obtained. It has to be predicted from the solubility product of minerals (Cronan et al, 1986), and the used equation is…”

Section: Jinhui LI and Hongxiao Tangmentioning

confidence: 99%

Acidification capacity model: formulation and application

Tang

1998

Water Research

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AbstractÐA theoretical computation approach and a classi®cation method of two-reference-states for the acidi®cation capacity of natural waters are developed after its de®nition, determination procedure and classi®cation methods are demonstrated. In the theoretical computation of acidi®cation capacity, the alkalinity, pH, chemical oxygen demand and Al(III) components of waters are chosen as the original parameters. The contribution of carbonate, dissolved organic matter, and soluble aluminum to the acidi®cation capacity is, respectively, emphasized. On the basis of theory of aquatic chemistry and the aquatic status of Southwest Area of China, the calibration value of methyl orange alkalinity to TIP alkalinity is calculated as 49 mM. The CaCO 3 water system which balances with CO 2 in the atmosphere, and the water system which holds the critical pH and balances with CO 2 in the atmosphere are considered as the reference state of the waters dicult to acidi®cation and the critical state of acidi®ed water. The annual amount of acid deposition including precipitation and dry deposition is used as the reference criterion to classify the waters easy and dicult to acidi®cation. As a case study, this model is applied to the southwest area of China, and some compatible results have been obtained. This model makes it possible to estimate the acidi®cation trend of natural waters in a large scale of area. # 1998 Elsevier Science Ltd. All rights reserved Key wordsÐacid rain, acidi®cation capacity, aquatic chemistry of acid rain, organic acid, aluminum

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Predicting aqueous aluminium concentrations in natural waters

Cited by 307 publications

References 18 publications

Effect of Sulfate on the Release Rate of Al³⁺ from Gibbsite in Low-Temperature Acidic Waters

Effect of Sulfate on the Release Rate of Al³⁺ from Gibbsite in Low-Temperature Acidic Waters

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

Acidification capacity model: formulation and application

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Predicting aqueous aluminium concentrations in natural waters

Cited by 307 publications

References 18 publications

Effect of Sulfate on the Release Rate of Al3+ from Gibbsite in Low-Temperature Acidic Waters

Effect of Sulfate on the Release Rate of Al3+ from Gibbsite in Low-Temperature Acidic Waters

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

Acidification capacity model: formulation and application

Contact Info

Product

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Effect of Sulfate on the Release Rate of Al³⁺ from Gibbsite in Low-Temperature Acidic Waters

Effect of Sulfate on the Release Rate of Al³⁺ from Gibbsite in Low-Temperature Acidic Waters