Experimental and theoretical treatment of elementary ligand exchange reactions in aluminum complexes

Article Abstract:

Substitution reaction studies on aluminum (hydr)oxide dissolution finds that hydroxide or fluoride ion substitution into the inner coordination sphere of the chemical greatly weakens water molecule-complex bonding. Findings however, show that there are differences in calculated and actual activation energies suggesting that a significant contributing factor to the required activation energy is the interaction between hydration waters and second-sphere water molecules.

Aluminum Compounds NEC, Aluminum compounds

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Biotic generation of Arsenic(III) in metal(oid)-contaminated freshwater lake sediments

Article Abstract:

Arsenic V biotic reduction experiments in groundwater sediments shows that sediments of the Coeur d'Alene Lake (CDAL) have the capacity for As(V) reduction. As(III) generation within As(V) amended organisms was measured to determine As mobility and biotic degradation was measured using an inhibitor of SRB metabolism (molybdate). Results show that amended sediment organisms displayed attenuated As (V) reduction capabilities.

Arsenic & Compounds, Land-Based Source Water Pollution, Biodegradation, Arsenic compounds, Water pollution, Lake sediments

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Influence of pH and competitive adsorption on the kinetics of ligand-promoted dissolution of aluminum oxide

Article Abstract:

Aluminum oxide dissolution rates in the presence of ligands are found to vary with changes suggesting that calculated rate constants are pH dependent. Arsenate and 8-hydroxyquinoline-5-sulfonate (HQS) are found to be exceptions to the general dissolution assumptions regarding ligands as HQS promotes oxide dissolution while arsenate does not encourage dissolution but adsorbs only to the aluminum oxide surface.

Aluminum Oxide

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