Stability of metal-organic complexes in acetone- and methanol-water mixtures

Article Abstract:

Potentiometric titration was used to measure the effects of mixed solvents on the complexation of some trace metals by organic ligands. Conditional stability constants increased as organic cosolvent content increased for complexes between Co(II) and oxalate, citrate, nitrilotriacetate and ethylenediaminetetraacetate (EDTA) in water-acetone and water-methanol mixtures. Complexation stability between Cu(II) and EDTA waned with increasing organic cosolvent concentration, while stability constants for Fe(III)-EDTA complexes depended minimally on the content of the organic cosolvent.

Usage, Organometallic chemistry, Solution (Chemistry), Solutions (Chemistry), Potentiometry

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Cosolvent effect on goethite surface protonation

Article Abstract:

An estimation of the protonation constants of goethite, the most abundant iron-oxide in soils, in cosolvents of environmental relevance revealed that the number of apparent surface sites increased as the cosolvent content increased. Constant capacitance and diffuse-layer models were used in calculating surface acidity constants in mixed solvent solutions, such as acetone-water and methanol-water mixtures. Results add to the sparse information available on mineral surface acidities in mixed solvent solutions.

Chemistry, Physical and theoretical, Physical chemistry, Solvents, Iron oxides, Acidity function

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Oxidation kinetics of Co(II)-EDTA in aqueous and semi-aqueous goethite suspensions

Article Abstract:

Complexation of metals to ethylenediaminetetraacetic acid (EDTA) poses a serious risk to the environment because EDTA is slowly biodegradable and resistant to decomposition. Cobalt (Co)-EDTA complexes have been the subject of numerous studies because they are persistent in the environment. Analysis of the oxidation kinetics of these complexes in aqueous and semi-aqueous goethite suspensions provide information on co-contaminant interactions of Co and EDTA in mixed waste environments.

Environmental aspects, Pollutants, EDTA, Coordination compounds, Cobalt, Ethylenediaminetetraacetic acid

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