Sorption of organic compounds

D. L. Jones and P. R. Darrah, Re-sorption of organic compounds by roots of Zea mays L. and its consequences in the rhizosphere I. Re-sorption of C labelled glucose, mannose and citric acid, Plant and Soil 143 259 (1992). 

There is more current literature which speaks to exactly this point. Hassett -0 has found that the sorption of organic compounds from water to suspended particles is altered in the presence of dissolved organic carbon. Griffin Chian - - and Diachenko have found that the volatility of organic compounds in water decreases when humic materials are present. Perdue -2 has found that the rate of hydrolysis of the octyl ester of 2,4-D is decreased in the presence of humic materials. 

In 1968, researchers discovered that a moderate amount of SOM had a pronounced influence on the sorption of organic compounds, unless SOM content is very low (Lambert 1968). Due to the high affinity, the interaction of SOM with HOCs may be described by the following equation ... 

Grathwohl (1990) found a relationship between sorption capacity and the the atomic H/O ratio of NOM. Similarly, there is a good relationship between log Koc and the polarity index (PI) of SOM, defined as the (0+N)/C ratio (DePaolis and Kukkonen 1997 Rutherford et al. 1992 Xing 1997 Xing et al. 1994a). The effect of SOM polarity on sorption of organic compounds is consistent with the well-known theory of solvent polarity on solute solubility. In studying the influence of SOM composition... 

Delle Site, A. (2001) Factors affecting sorption of organic compounds in natural sorbent/water systems and sorption coefficients for selected pollutants. A review. J. Phys. Chem. Ref. Data 30, 187-439. 

Fig. 13 Representation of the sorption of organic compounds to two forms of sediment organic matter, amorphous organic matter and black carbon (BC), and its effect on bioavailability...

Few studies have been carried out on the volatization rates of organics in land-applied sludges. The presence of organic matter in the sludge may increase the sorption of organic compounds and thus reduce volatilization rates. 

These authors reported a significant correlation between the Koc values obtained from the sorption of organic compounds on three sediments and the partition constants (K0Vf) for the partitioning of the compounds between octanol and water (Eq. 2) ... 

Brusseau, M.L. and Rao, P.S.C. Influence of sorbent structure on nonequilibrium sorption of organic compounds, iinviron. Sci Technol, 25(8) 1501-1506, 1991. 

Hu, Q., Wang, X., and Brusseau, M.L. Quantitative structure-activity relationships for evaluating the influence of sorbate structure on sorption of organic compounds by soil, iujFiron. Toxicol. Chem., 14(7) 1133-1140, 1995. 

As indicated earlier (Section 3.1.1) the sorption of organic compounds onto dissolved matter can significantly increase the solubility of the compound. This can in turn affect the fate of these chemicals in the environment. We can use physicochemical parameters such as distribution coefficients (log D), aqueous acid dissociation constants (pAia), and octanol-water partition coefficients (p/to )-These attributes are also linked to the acidity and alkalinity of the environment as well as lipohilicity of the compound. The mathematical relationships between these attributes are outlined below to explore how each of these impacts the fate of PPCPs in the environment. 

To date, the majority of studies on the sorption of organic compounds to DOM have been conducted with PAHs. Therefore, in contrast to the situation found for soil,... 

What is a sorption isotherm Which types of sorption isotherms may be encountered when dealing with sorption of organic compounds to natural sorbents Does the shape of a sorption isotherm tell you anything about the sorption mechanism(s) If yes, what If no, why not ... 

Returning to our effort to anticipate the overall sorption of organic compounds that may act both as counterions and as surface ligands, we can recognize all the terms in the second half of Eq. 11-89 ... 

The high hydrophobicity of ZSM-5 permits the selective sorption of organic compounds dissolved in water. A high (1670 1) silica/alumina ratio ZSM-5 preferentially sorbed n-butyl alcohol (90.7% sorbed) from iso-butyl alcohol (17.3% sorbed) and tert-butyl alcohol ( 0% sorbed), all dissolved in water. 

Physical and Chemical Properties Affecting the Sorption of Organic Compounds to Environmental Solids... 

Salts can affect sorption of organic compounds by displacing cations from the soil ion exchange matrix, by changing the activity of the sorbate in solution, and by changing the charge density associated with the soil sorption surface (Hamaker and Thompson, 1972). Salt effects are most important for basic sorbates in the cation state, where an increase in salinity can significantly lower the sorption coefficient. Salt effects are least important for neutral compounds, which may show either increases or decreases in sorption as salinity increases. 

Despite its imperfections, the Koc approach is currently the most widely used and generally applicable method for predicting the sorption of organic compounds to soils and sediments. It is most appropriate for predicting the sorption of non-polar organic compounds... 

Brusseau, M.L. 1993. Using QSAR to evaluate phenomenological models for sorption of organic compound by soil. Environ. Toxicol. Chem. 12 1835-1846. 

Kile, D.E., R.L. Wershaw, and C.T. Chiou. 1999. Correlation of soil and sediment organic matter polarity to aqueous sorption of organic compounds. Environ. Sci. Technol. 33 2053-2056. 

Cornelissen, G., Gustafsson, O., Bucheli, T.D., Jonker, M.T.O., Koelmans, A.A., van No-ort, P.C.M., 2005. Extensive sorption of organic compounds to black carbon, coal, and kerogen in sediments and soils Mechanisms and consequences for distribution, bioaccumulation, and biodegradation. Environ. Sci. Technol. 39, 6881-6895. 

Shevchenko, S.M. and Bailey, G.W., Non-bonded organo-mineral interactions and sorption of organic compounds on soil surfaces A model approach, Theochem. J. Mol. Struc., 422, 259, 1998. 

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