Soil interactions permanent charge surfaces

Triazines interact with surfaces of inorganic materials in soil environments. The nature and the extent of these interactions depend on both the properties of the inorganic surfaces and the chemistry of the soil solution. Inorganic surfaces in soil environments may be grouped as uncharged, variable charge, and permanent charge surfaces. 

The results of the measurements carried out with an excess of cationic electrol)de and with calcium chloride are shown in Figs. 2—3. An increase of the hydronium ions concentration in the aqueous phase is coupled with an increase of the positive charge of the particles. This can be derived from the slope of the regression line. This result was expected because of the interaction of the hydronium ions with the surfaces of the soil eomponents. The value of the slope is higher for sesquioxides in comparison with clay minerals. The smface of montmorillonite is negatively charged because of the permanent charge. 

Abstract The adsorption of ionic surfactants on different soil components such as silica, clay minerals, and humic acids was studied. The adsorption processes were controlled by flow microcalorimetry to determine the molar adsorption enthalpies of surfactant accumulation on clay and silicate surfaces. The evaluation of adsorption results for cationic surfactants has shown different mechanisms for solids having permanent (kaolinite, illite, montmorillonite) and pH-dependent surface charges (silica gels and powders). The adsorption mechanism for surfactants on silica surfaces with pH-dependent charges has been explained in terms of the development of charges on the surfaces and their interaction with... 

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