PMID: 12102316Jul 10, 2002Paper

Cosolvent effects on sorption isotherm linearity

Journal of Contaminant Hydrology
Dermont C Bouchard

Abstract

Sorption-desorption hysteresis, slow desorption kinetics, and other nonideal phenomena have been attributed to the differing sorptive characteristics of the natural organic polymers associated with soils and sediments. In this study, aqueous and mixed solvent systems were used to investigate the effects of a cosolvent, methanol, on sorption isotherm linearity with natural organic matter (NOM), and to evaluate whether these results support, or weaken, the rubbery/glassy polymer conceptualization of NOM. All of the sorption isotherms displayed some nonlinear character. Our data indicates that all of the phenanthrene and atrazine isotherms were nonlinear up to the highest equilibrium solution concentration to solute solubility in water or cosolvent ratios (Ce/Sw,c) used, approximately 0.018 and 0.070, respectively. Isotherm linearity was also observed to increase with volumetric methanol content (fc). This observation is consistent with the NOM rubbery/glassy polymer conceptualization: the presence of methanol in NOM increased isotherm linearity as do solvents in synthetic polymers, and suggests that methanol is interacting with the NOM, enhancing its homogeneity as a sorptive phase so that sorption is less bimodal as fc increases...Continue Reading

References

May 16, 2001·Environmental Science & Technology·G Xia, J J Pignatello
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Citations

Oct 26, 2011·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Juhee KimYong Sik Ok
Jan 24, 2012·Journal of Hazardous Materials·Hongbo PengBaoshan Xing
Aug 30, 2011·Journal of Contaminant Hydrology·P Schultz BirakC T Miller
Jan 16, 2009·Journal of Environmental Sciences (China)·Hong ChenHuimin Zhao
Apr 11, 2003·Environmental Toxicology and Chemistry·Dermont C Bouchard
Oct 14, 2008·Journal of Hazardous Materials·Xiaosong Chen, Clayton J Clark
Jun 2, 2006·Journal of Environmental Quality·Joseph J PignatelloBaoshan Xing
Mar 21, 2008·Environmental Science & Technology·Michal Shechter, Benny Chefetz

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