The formation of polynuclear Al13 under simulated natural conditions

Furrer, Gerhard; Trusch, Bernhard; Müller, Christian

doi:10.1016/0016-7037(92)90174-h

Cited by 74 publications

(44 citation statements)

References 21 publications

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“…The rate of base injection into the Al-containing solution has been shown to influence the amount of measurable Al 13 (Akitt and Farthing, 1981a,b;Bertsch, 1987;Furrer et al, 1992;Parker and Bertsch, 1992). Many reports (Bertsch, 1987;Furrer et al, 1992;Parker and Bertsch, 1992) suggested that ''slow'' neutralization favor Al 13 formation, and that ''rapid'' neutralization tend to favor Al u .…”

Section: Comparison Of Different Methods On Formation Of Al 13mentioning

confidence: 99%

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Optimum conditions for Al13 polymer formation in PACl preparation by electrolysis process

Liu

2004

Chemosphere

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Section: Comparison Of Different Methods On Formation Of Al 13mentioning

confidence: 99%

“…Many reports (Bertsch, 1987;Furrer et al, 1992;Parker and Bertsch, 1992) suggested that ''slow'' neutralization favor Al 13 formation, and that ''rapid'' neutralization tend to favor Al u . Table 4 shows the distribution of Al m , Al 13 , Al u in PACl prepared with different approaches.…”

Section: Comparison Of Different Methods On Formation Of Al 13mentioning

confidence: 99%

Optimum conditions for Al13 polymer formation in PACl preparation by electrolysis process

Liu

2004

Chemosphere

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“…It can be argued that the increased sorption of Al with increasing solution concentration is an artefact due to the high Al concentration, which favours polymerisation of Al (Furrer et al 1992). Yet, dialysis of pectic acid solution (34 µmole GalA/5 ml) against 1, 2 or 4 L of 33 µM Al solution for 8 d resulted in 87-143% Al saturation (Table 2).…”

Section: Sorption Of Al From Dilute Al Solutionmentioning

confidence: 97%

Comparative hydrolysis and sorption of Al and La onto plant cell wall material and pectic materials

et al. 2010

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Pectin, which is an important component of plant cell walls, strongly binds Al and this may play a role in expression of Al toxicity. Sorption of aluminium (Al) and lanthanum (La) from aqueous solutions onto pectic acid, Ca-pectate and plant cell wall material was pH dependent. For Al at pH 3, sorption was less than the available sorption sites (i.e., the cation exchange capacity) on all three sorbents, whereas at pH 4, sorption of Al was in excess of available sorption capacity. By contrast, sorption of the trivalent Al analogue La corresponded to the available sorption capacity on all three sorbents at pH 5. This indicates, therefore, that Al hydrolyses at ≥ pH 4, and hydrolysis increases with Al concentration in solution. Further, it is proposed that the sorption of Al to pectin leads to deprotonation of the galacturonic acid (GalA) residues. Sorption of Al to pectin limits hydrolysis of Al, thereby shifting the pH of hydrolysis to a higher value. Hydrolysis of Al results in its sorption in excess of the stoichiometric equivalent (assuming the free Al 3+ ion), leading to oversaturation of the pectin with Al. Staining of the metal-pectate complexes with the metachromatic dye eosin showed that with increasing Al saturation (but not La saturation), the complex developed a positive net charge, due to formation of some positively charged Al-complexes. The development of a positive charge on the Al-pectate complex may have major effects on cellular transmembrane potential and nutrient acquisition by plant roots. This is the first report of Al binding in excess of binding sites and development of a net positive charge on Al-pectate.

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“…Table 2 5. RESULTS/ VARIANCES/CONCLUSIONS ) and aluminum polymetal reactions taken from the studies of Baes and Mesmer (1986) and Furrer et al (1992). Using this model, we examined the importance of polyaluminum oxo-hydroxo species in various total aluminum concentration, pH and temperature ranges.…”

Section: Methodolgy Tequil Free Energy Models To Temperatures Near 3mentioning

confidence: 99%

“…To evaluate the importance of polyaluminum hydrolysis species, we developed an approximate model at 25°C and 100°C using the concentration products for Al 3+ hydrolysis producing polyaluminum ion species taken from the studies of Baes and Mesmer (1986) and Furrer et al (1992) (see section 5-1). Model predictions showed that an accurate pH dependent model of aluminum aqueous chemistry could be developed for application to a wide range of reservoir fluids in equilibrium with their surroundings using only monoaluminum hydrolysis products.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Geothermal Systems Research and Development: Models of Subsurface Chemical Processes Affecting Fluid Flow

Møller¹,

Weare²

2008

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The formation of polynuclear Al13 under simulated natural conditions

Cited by 74 publications

References 21 publications

Optimum conditions for Al13 polymer formation in PACl preparation by electrolysis process

Optimum conditions for Al13 polymer formation in PACl preparation by electrolysis process

Comparative hydrolysis and sorption of Al and La onto plant cell wall material and pectic materials

Enhanced Geothermal Systems Research and Development: Models of Subsurface Chemical Processes Affecting Fluid Flow

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