Results 201 to 210 of about 8,245 (240)
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The adsorption of lead species on goethite
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2000Adsorption of lead ionic species at the goethite aqueous interface, as well as the electrokinetic properties of the system, were measured as a function of pH. The interpretation was based on the Surface Complexation Model assuming that association of lead species with negatively charged surface sites takes place.
Kovačević, Davor +4 more
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Communications in Soil Science and Plant Analysis, 2007
Abstract Goethite, aluminum‐(Al)‐substituted goethite (GA2), and a system of kaolinite–goethite were examined for their ability to adsorb copper (Cu), zinc (Zn), and cadmium (Cd) as a function of pH, in two ionic strengths and two different metal concentrations. Specific surface area was determined by BET‐N2, whereas the charge development on the solid
Emmanuel Spathariotis +1 more
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Abstract Goethite, aluminum‐(Al)‐substituted goethite (GA2), and a system of kaolinite–goethite were examined for their ability to adsorb copper (Cu), zinc (Zn), and cadmium (Cd) as a function of pH, in two ionic strengths and two different metal concentrations. Specific surface area was determined by BET‐N2, whereas the charge development on the solid
Emmanuel Spathariotis +1 more
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Comparison of Selenate and Sulfate Adsorption on Goethite
Journal of Colloid and Interface Science, 2001The adsorption behavior of selenate (SeO(4)) on goethite has been studied under a wide range of conditions. SeO(4) adsorption has been compared with the binding of SO(4). The experimental results are interpreted in view of very recent spectroscopic work on the speciation and coordination of adsorbed selenate and sulfate on goethite.
Rietra, R.P.J.J. +2 more
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Gibbsite and Goethite Solubility
Soil Science Society of America Journal, 20052‐Ketogluconate (kG) is a microbial byproduct that has been isolated from the rhizosphere of several plants and has been found to accumulate around bacteria adhering to rock surfaces. It has long been suspected that kG may play a role in enhancing the bioavailability of soil nutrients.
Michael E. Essington +2 more
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Clays and Clay Minerals, 2005
AbstractHigh-temperature oxide-melt solution calorimetry and acid-solution calorimetry were used to determine the heat of dissolution of synthetic goethite with particle sizes in the range 2–75 nm and measured surface areas of 30–273 m2/g (27–240 × 103 m2/mol).
Lena Mazeina, Alexandra Navrotsky
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AbstractHigh-temperature oxide-melt solution calorimetry and acid-solution calorimetry were used to determine the heat of dissolution of synthetic goethite with particle sizes in the range 2–75 nm and measured surface areas of 30–273 m2/g (27–240 × 103 m2/mol).
Lena Mazeina, Alexandra Navrotsky
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Magnetism in aluminous goethite
Physics and Chemistry of Minerals, 1991Magnetism in fine particles of goethite which contain 5, 11, 18 and 30 mole % aluminium has been investigated. Mossbauer spectroscopy was used, with the samples at 4.2 K and in applied magnetic fields of 0–8 T. Analysis was via a mean field model, in which the spectra from each sample were simultaneously least-squares fitted.
R.J. Pollard, Q.A. Pankhurst, P. Zientek
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Kinetics of phosphate sorption by goethite‐ and bentonite‐goethite (b‐g) system
Communications in Soil Science and Plant Analysis, 1998Abstract The study of phosphate (PO4) fixation due to reactions which occur to the surface of soil minerals has been limited by a lack of evidence on which a structural model may be based. A structural model should attempt at least to describe the coordination on the absorbed PO4 3‐ ion, that is, to indenfity the immediate neighbour atoms or ions in ...
Anthoula Dimirkon, Andreas Ioannou
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Transformation of Hematite to Goethite in Soils
Nature, 1971IN many parts of the world, especially in those that were not glaciated during the Pleistocene epoch, red hematitic soils that formed in a previous climate (different from the present one) still exist. In regions where the present climate is cooler and more humid than the previous one, the red colour seems to be disappearing and being replaced by more ...
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