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property exhibited by a colloidal solution is Brownian movement. Due to unbalanced, SOIL, 3, CHEMISTRY, Father of, f soil chenů stryy ThONas, Soil Chemistry: It is the study of the chemical characteristics of the soil. Soil, chemistry is affected by mineral composition, organic matter and environmental, factors., Soil Colloid - The colloidal state refers to a two-phase system in which one material, (or materials) in a very finely divided state is dispersed through a second. Few, examples of the colloidal state – milk - cheese (perfect example for colloidal solution),, clouds-fog, starch, gelatin, rubber, proteins, blood and soil. In general, the range of, true colloids is from 2 nm to 200 nm. Ionic solutions (<2 nm) are transparent and light, |, can pass through these in such a way that an object can be seen through it, where as, through a colloidal solution light is scattered randomly, so that while object cannot, Dc seen through it, but a glow of light, of course, can be seen. The scattering of light, by colloids is called Tyndall scattering or simply Tyndall effect. Another important, Ploperty exhibited by a colloidal solution is Brownian movement. Due to unbalanced, ipact of solvent molecules on colloid particles, these particles move in a zig-zag, ay in the soil solution. Colloids are two types - Lyophilic and Lyophobic., Scanned by TapScanner
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microscope and they migrate in different direc-, Soil Science Treati, The particles cannot be easily detected in ultra-, VThe surface tension is usually lower and viscosity, is much higher than that of dispersion medium, VThese colloids are get stabilized against floccula-, The particles are easily detected in ultra-micro-, V The surface tension and viscosity of this colloidal, system is similar to that of the dispersion medium., 132, S. No, Colloid type, Properties, Lyophilic, is much higher than that of dispersion mediu, Large quantities of electrolytes cause precipitasio, VThe particles cannot be easily detected in u, microscope and they migrate in different di, tions or not at all in an electric field., tion upon addition of electrolytes., The surface tension and viscosity of this colloidal, Lyophobic, V Small quantities of electrolytes can cause, precipi-, tation., scope and they migrate in one direction in an, electric field., V Very sensitive to electrolyte addition and floccu-, late very easily., VNot stabilized by the solvent molecules, [NOTE: Soil particles less than 0.001 mm size (less than 1 micron) possess colloidal, properties and are known as soil colloids], Soil colloids can be broadly classified into two types, depending on the nature of, the linkages present and the types of compounds formed. These are, 1) Inorganic colloids, 2) Organic colloids, The inorganic colloids cover aluminosilicate layer lattice clay minerals, hydrous, oxides and hydroxides of Fe, Al, Si and Mn in clay – sized primary minerals. The, organic colloidal fraction in the soil is constituted by soil humus, 1. Inorganic Soil Colloids – The aluminosilicate layer-lattice clays, the chiet, inorganic colloidal fraction in soil, are derived from the silicate minerals. Silicates, Scanned by TapScanner, 1., 2.
