[Nonlinear sorption behaviors of chlorobenzenes on sediments].
Sorption isotherms of chlorobenzene, 1,4-dichlorobenzene, 1,2,4-trichlorobenzene and 1,2,4,5-tetrachlorobenzene on 5 sediments were examined to understand its sorption behavior. All systems examined exhibits nonlinear sorption. All sorption isotherms are nonlinear as evidenced by the Freundlich n values of 5 sediments being between 0.858 to 0.956. Sorption nonlinearity is found to be a function of the polarity index of sediments natural organic matter (NOM) with a high correlative coefficient of 0.9947, suggesting that the degree of condensation of NOM, characterized by its polarity index, is correlated with the sorption behavior of 1,2,4-trichlorobenzene. In addition, the sorption affinity (Koc) of the sediments for 1,2,4-trichlorobenzene increases with decreasing of NOM polar, indicating that a higher sorption affinity in the sediments is associated with a higher degree of condensation of NOM. The Freundlich n values of chlorobenzene, 1,4-dichlorobenzene, 1,2,4-trichlorobenzene and 1,2,4,5-tetrachlorobenzene are 0.755, 0.788, 0.858, 0.949 respectively, indicating that the smaller CBs molecule may result in more significant sorption nonlinearity.
School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China. shonger@sohu.com
Yue-hong
YH
Shu
Xiao-ren
XR
Huang
Xiao-shan
XS
Jia
D000327:Adsorption; D002681:China; D002722:Chlorobenzenes / Q000032:analysis*; D004784:Environmental Monitoring; D005618:Fresh Water / Q000032:analysis*; D019015:Geologic Sediments / Q000737:chemistry*; D008956:Models, Chemical; D017711:Nonlinear Dynamics; D045483:Rivers; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry
D002722:Chlorobenzenes; D014874:Water Pollutants, Chemical