Arsenate and Chromate Retention Mechanisms on Goethite. 2. Kinetic Evaluation Using a Pressure-Jump Relaxation Technique

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Department of Plants, Soils, and Biometeorology, Utah State University, Logan, Utah 84322-4820, Department of Agronomy, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge, Louisiana 70803-2110, Department of Plant and Soil Sciences, University of Delaware, Newark, Delaware 19717-1303, USDA-ARS, U.S. Salinity Laboratory, 450 Big Springs Road, Riverside, California 92507, and Battelle, Pacific Northwest Laboratory, Richland, Washington 99352

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Arsenate and Chromate Retention Mechanisms on Goethite. 2. Kinetic Evaluation Using a Pressure-Jump Relaxation Technique

Department of Plants, Soils, and Biometeorology, Utah State University, Logan, Utah 84322-4820, Department of Agronomy, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge, Louisiana 70803-2110, Department of Plant and Soil Sciences, University of Delaware, Newark, Delaware 19717-1303, USDA-ARS, U.S. Salinity Laboratory, 450 Big Springs Road, R...

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Kinetics of Selenate and Selenite Adsorption/Desorption at the Goethite/Water Interface

w Kinetics and mechanisms of selenate and selenite adsorption/desorption a t the goethitelwater interface were studied by using pressure-jump (p-jump) relaxation with conductivity detection at 298.15 K. A single relaxation was observed for selenate Se0:adsorption. This relaxation was ascribed to Se0,2on a surface site through electrostatic attraction accompanied simultaneously by a protonation ...

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Residence Time Effects on Arsenate Adsorption/Desorption Mechanisms on Goethite

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A New Surface Complexation Model for Chromate Adsorption on Ferrihydrite

Surface complexation models (SCMs) provide a mechanistic and thermodynamicallybased description of sorption reactions on mineral surfaces and can thus be used in geochemical modelling to predict contaminant sorption under a variety of geochemical conditions. In the last years, substantial effort has been put into obtaining multiple lines of evidence for the types of complexes formed on mineral ...

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Cation-Exchange Kinetics on Montmorillonite Using Pressure-Jump Relaxation

Batch and flow methods are usually not suitable for measuring kinetics of ion-exchange reactions on soils and soil constituents. These reactions are usually very fast. Thus, a rapid kinetic method must be employed. A pressure-jump relaxation technique was used in this study to investigate the kinetics of Ca-Na and Ca-K exchange on montmorillonite. Single relaxations were observed in both system...

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تاریخ انتشار 1997