Adsorption by clay

Shikazono and Shimizu (1987) concluded that Ag contents of gold precipitated from low-salinity fluids is higher than that prediction and the relationship between NAg of gold and salinity of fluid inclusions estimated from freezing temperature data. Therefore, another interpretation is that NAg of gold from shale-hosted deposits is lower than that from sandstone-hosted deposits, because shale is expected to be richer in Cl mainly due to adsorption by clay minerals included in shale than sandstone. 

Bollag JM, LoU Ml (1983) Incorporation of xenobiotics in soil humus. Experentia 39 1221-1225 Bollag JM, Myers CJ, Minard RD (1992) Biological and chemical interactions of pesticides with soil organic matter. Sci Total Environ 123/124 205-217 Bolt GH (1955) Ion adsorption by clays. Soil Sd 79 267-278... 

Hedges, J.I., and Hare, PE. (1987) Amino acid adsorption by clay minerals in distilled water. Geochim. Cosmochim. Acta 51, 255-259. 

Adsorption by Clays, Pillared Layer Structures and Zeolites... 

Hedges, J. I., and P. E. Hare. 1987. "Amino acid adsorption by clay minerals in distilled water." Geochimica Cosmochimica Acta 51 255-259. 

Kent et al. (1986) have tabulated reported TL intrinsic constants and , values for a variety of metal oxyhydroxides of Al, Si, Fe, and Ti. More recently. Smith and Jenne (1988,1991) reevaluated published TL modeling of adsorption by ferric oxyhydroxide solids and by 5-Mn02. Their analysis led to a set of intrinsic constants based on measurement and estimation that have been reproduced in Tables 10.12 and 10.13. The intrinsic constants in the tables were derived independent of values for C[ chosen by others. Few studies have applied TL modeling to adsorption by clays, although James and Parks (1982) and Mahoney and Langmuir (1991) TL-modeled alkali metal and alkaline earth adsorption by clays, including beidellite, illite, kaolinite, and montmorillonite. 

Jaynes, W.E, Zartman, R.E., and Hudnall, W.H., 2007. Aflatoxin B, adsorption by clays from water and corn meal, Appl. Clay Sci., special issue, 36(1-3), pp. 197-205. 

Various chemical surface complexation models have been developed to describe potentiometric titration and metal adsorption data at the oxide—mineral solution interface. Surface complexation models provide molecular descriptions of metal adsorption using an equilibrium approach that defines surface species, chemical reactions, mass balances, and charge balances. Thermodynamic properties such as solid-phase activity coefficients and equilibrium constants are calculated mathematically. The major advancement of the chemical surface complexation models is consideration of charge on both the adsorbate metal ion and the adsorbent surface. In addition, these models can provide insight into the stoichiometry and reactivity of adsorbed species. Application of these models to reference oxide minerals has been extensive, but their use in describing ion adsorption by clay minerals, organic materials, and soils has been more limited. 

Fox, I. and Malati, M.A., An investigation of phosphate adsorption by clays and its relation to the problems of eutrophication of the river Stour, Kent, J. Chem. Tech. Biotechnol., 57, 97, 1993. 

However, the presence of extraneous ions such as Fe or Cl, eitha-in clays or soils, may not be acceptable for environmental reasons, not to mention their probable adsorption by clays. The idea of a depolarization reaction leaves open, however, the possibility of a suitable reaction (other than O2 evolution) at the anode, for example, some organic oxidation such as that of HCOO or CH3COO or CH 3OH or CeHs OH. This may also provide a method of using anodic oxidation to clean soils contaminated by organics. 

Hang, P.T., and G.W. Brindley. 1970. Methylene blue adsorption by clay minerals. Determination of surface areas and cation exchange capacities. Clay Clay Miner. 18 203-212... 

PROBABLE FATE photolysis possible but actual significance is uncertain will also degrade by reactions with radicals oxidation oxidation by metal cations is very fast, reactions with oxygen and/or hyperoxy radicals are very important, photooxidation half-life in water 1.3-72.5 days, photooxidation half-life in air 0.312-3.12 hrs hydrolysis not an important process volatilization not an important process sorption very rapid adsorption by clay minerals, if spilled on soil, it will adsorb to it, especially if the soil is acidic biological processes no bioaccumulation, only slight biodegradation... 

---