Article Abstract:
It is believed that surface complexation models can possibly describe the sorption of trace metals on natural sediments. Researchers performed an experiment based on 11 geographically and hydrologically diverse natural aquatic sediment samples to validate the assumption. The sorption isotherm and pH-edge sorption experiments evaluated the sorption of Cu(II), Zn(II), Pb(II), and Cd(II) on the sediment samples. The experiment utilized the surface complexation model (the double-layer model) to observe the linear free energy relationship (LFER) between the surface complexation constants of trace metals on the sediments and the first-hydrolysis constants.
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Article Abstract:
The determination of the extent of competitive oxalate and chromate adsorption on goethite and the validity of two surface complexation models' predicting capacity are discussed. Adsorption was measured as a function of acidity in goehtite suspensions at constant ionic strength and temperature. Homogenous sites were assumed in modeling the data using diffuse-layer and triple-layer models. It was found that chromate has a higher affinity with the goethite surface although the two models maintained poor predictive capabilities for binary solute adsorptions.
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Article Abstract:
The chemical properties of colloidal material must be related to its physical properties to determine the material's function as an agent of environmental pollution. Physical characteristics such as size, morphology and conformational transformation have been identified with colloid circulation in environmental systems. Such characteristics can be identified by careful application of analytical methods including sampling, storage or fractionation.
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