Ion Transport and Permeability in an Allophanic Andisol at Low pH

Ishiguro, Munehide

doi:10.1111/j.1747-0765.2005.tb00080.x

Cited by 5 publications

(2 citation statements)

References 12 publications

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“…The use of surfactants for soil washing to remove low-solubility organic contaminants, such as oils, also changes the inter-particle interactions and can result in a significant change in the hydraulic conductivity of porous media [279,283]. Electrolyte concentration, pH and specific ions that all likely affect the particle-particle interaction may also change the soil permeability [263,[288][289][290][291][292][293][294][295][296][297]. An example of the effect of surfactant adsorption on soil stability is depicted in Fig.…”

Section: Influence Of Surfactant Adsorption On Soil Structure and Permentioning

confidence: 99%

Surfactant adsorption to soil components and soils

Ishiguro

Koopal

2016

Advances in Colloid and Interface Science

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111

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Soils are complex and widely varying mixtures of organic matter and inorganic materials; adsorption of surfactants to soils is therefore related to the soil composition. We first discuss the properties of surfactants, including the critical micelle concentration (CMC) and surfactant adsorption on water/air interfaces, the latter gives an impression of surfactant adsorption to a hydrophobic surface and illustrates the importance of the CMC for the adsorption process. Then attention is paid to the most important types of soil particles: humic and fulvic acids, silica, metal oxides and layered aluminosilicates. Information is provided on their structure, surface properties and primary (proton) charge characteristics, which are all important for surfactant binding. Subsequently, the adsorption of different types of surfactants on these individual soil components is discussed in detail, based on mainly experimental results and considering the specific (chemical) and electrostatic interactions, with hydrophobic attraction as an important component of the specific interactions. Adsorption models that can describe the features semi-quantitatively are briefly discussed. In the last part of the paper some trends of surfactant adsorption on soils are briefly discussed together with some complications that may occur and finally the consequences of surfactant adsorption for soil colloidal stability and permeability are considered. When we seek to understand the fate of surfactants in soil and aqueous environments, the hydrophobicity and charge density of the soil or soil particles, must be considered together with the structure, hydrophobicity and charge of the surfactants, because these factors affect the adsorption. The pH and ionic strength are important parameters with respect to the charge density of the particles. As surfactant adsorption influences soil structure and permeability, insight in surfactant adsorption to soil particles is useful for good soil management.

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Section: Influence Of Surfactant Adsorption On Soil Structure and Permentioning

confidence: 99%

Surfactant adsorption to soil components and soils

Ishiguro

Koopal

2016

Advances in Colloid and Interface Science

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111

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“…The soil dispersed well and the permeability decreased well at pH 9 more than those at pH 6 for the montmorillonitic and the kaolinitic soil (Suarez et al 1984). The allophanic andisol dispersed well and the permeability decreased well at pH < 5 and pH >10 (Nakagawa and Ishiguro 1994;Ishiguro and Nakajima 2000;Ishiguro 2005). Therefore, pH is one of the most important factors when we consider the influence of dispersionflocculation.…”

Section: Introductionmentioning

confidence: 99%

Influence of phosphate sorption on dispersion of a Ferralsol

Pham

Ishiguro

Tran

et al. 2014

Soil Science and Plant Nutrition

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Soil dispersion induces soil erosion and colloidal leaching. Nutrients are lost at the same time and this causes water contamination. Phosphate is an essential element for living organisms. Because phosphate influences soil dispersion and it is an important limited resource, this influence must be evaluated well in order to diminish negative effects on soil structure. In this paper, we firstly evaluated the influence of phosphate sorption on soil dispersion by calculating repulsive potential energy between soil particles. Ferralsol, which is a typical soil in rainy tropical regions, was used as the material. The dispersion-flocculation phenomena were investigated with absorbance of soil suspension under different pH, phosphate adsorption and electrolyte concentration in an Na-NO 3 -PO 4 system. The repulsive potential energy was calculated based on the diffuse double layer theory and the measured zeta potential. We indicated that the measured absorbance increased with the increase of the repulsive potential energy. The repulsive potential energy increased with increasing phosphate sorption up to about 5 to 20 mmol kg −1 at all pH, and it induced the soil dispersion, because phosphate sorption increased the negative charge of the soil. After its peak, it decreased with increasing phosphate sorption because the electrolyte concentration increased and the electrolyte screened the electric field near the soil surface. The repulsive potential energy also increased with increasing pH because of the increase of the negative charge of the soil. Even at low pH, after a certain amount of phosphate sorption, the soil dispersed due to the increase of repulsive potential energy, although the soil flocculated before phosphate application. Because the soil dispersion causes soil and phosphorus loss, the influence of soil pH and phosphate sorption on the soil dispersion should be considered for good soil management.

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Soil Interfacial Electrical Phenomena

Ishiguro

2016

Encyclopedia of Biocolloid and Biointerface Science 2V Set

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Ion Transport and Permeability in an Allophanic Andisol at Low pH

Cited by 5 publications

References 12 publications

Surfactant adsorption to soil components and soils

Surfactant adsorption to soil components and soils

Influence of phosphate sorption on dispersion of a Ferralsol

Soil Interfacial Electrical Phenomena

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