Benthic Chamber Chemistry

Dyrssen, David; Hall, Per; Westerlund, Stig

doi:10.1007/978-3-642-69777-7_40

Cited by 1 publication

(1 citation statement)

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“…We carried out this analysis as a series of model calculations with the computer program SOLGASWATER, in which surface complexation, aluminum hydrolysis, and aluminum hydroxide/phosphate precipitation were simultaneously considered. The thermodynamic data used in these calculations ,,− are given in Table . As seen in this table, the surface active sites are treated as a separate component by the program.…”

Section: Thermodynamic Simulationsmentioning

confidence: 99%

Balance between Surface Complexation and Surface Phase Transformation at the Alumina/Water Interface

1998

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This paper synthesizes and expands on the results of a recent series of investigations aimed at characterizing the interactions of orthophosphate, phenylphosphonate, and clodronate ions with hydrous alumina surfaces. The paper shows that γ-Al2O3 is a thermodynamically unstable substance in water, which undergoes a (surface) phase transformation into bayerite, -Al(OH)3. Furthermore, it also shows that while phenylphosphonate ions are exclusively adsorbed via surface complexation to the alumina surfaces, clodronate ions dissolve the alumina phase and precipitate as an aluminum clodronate phase. Orthophosphate ions show a transient behavior in this respect, and the limits for, and consequences of, AlPO4(s) formation are determined via a series of chemical modeling calculations. The paper finally shows that, with respect to phenylphosphonate surface complexation, care must be taken when macroscopically derived stoichiometric compositions are used to assign microscopic surface complex structures.

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