Bonding mechanisms of salicylic acid adsorbed onto illite clay: an ATR-FTIR and molecular orbital study

Article Abstract:

The attenuated total reflectance Fourier-transform infrared spectroscopy and molecular orbital calculation were utilized to analyze the chemical bonding between salicylic acid and illite clay. The study was undertaken to understand how organic molecules are absorbed by natural organic matter and subsequently absorbed by the soil. Results showed a monodentate complex is formed at neutral pH between the salicylate anions and the Al3+ octahedra at the illite clay edges, and a bidentate complex at lower pH between the carboxylate oxygen atoms and two vicinal Al3+ octahedra.

Soil chemistry, Humus, Clay soils, Molecular orbitals

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Nonequilibrium transport of reactive solutes through layered soil profiles with depth-dependent adsorption

Article Abstract:

The travel time of the pesticide atrazine through layered soil columns containing the same amount of sludge or manure appear to increase consistently in the columns for both distributions. The travel time was measured by temporal moment analysis based on the identified travel time probability density function. An enhanced accessibility by atrazine to sorption sites of organic changes could result from either a higher overall distribution coefficient or a higher fraction of adsorption sites.

Household & Industrial Pesticides, Pesticides, Atrazine

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Deposition of oil-in-water emulsions in sand beds in the presence of cetyltrimethylammonium bromide

Article Abstract:

A study was conducted to test the activities of the surfactant cetyltrimethylammonium bromide on the properties of sand and emulsion droplets that enhance transport to the subsurface. The study showed cetyltrimethylammonium bromide's effects as surfactant is effective only at a concentration of 5 x 10(super-6) M. Concentrations above and below this level results in the slowdown of deposition and transport efficiency. This has been proven through the DLVO energy barriers model.

Surface active agents, Surface Active Agent Manufacturing, Cationic Surfactants, Soil Stabilizers, Methods, Soil pollution, Soil disinfection, Soil permeability

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