INFLUENCE OF LINEAR ALKYLBENZENE SULFONATE (LAS) AS ORGANIC COSOLVENTON LEACHING BEHAVIOR OF PCDD FS FROM FLY-ASH AND SOIL/

The leaching of polychlorinated dibenzo-p-dioxins and dibenzofurans (P CDD/Fs) was measured in soil and standard fly ash column eluted with p ure water and linear alkylbenzene sulfonate (LAS)- water. The data obt ained were used to evaluate the leachability of PCDD/Fs from waste dum p like incineration residual slag and fly ash deposition. The leaching rate was shown to be increased significantly by using LAS water. The leachate contents of PCDD/Fs were above their known water solubility. Concentration of PCDD/Fs in the leachates as well as the relative leac hing (calculated on the fly ash content) increased with increasing chl orinating degree and decreasing water solubility. LAS above the critic al micelle concentration (CMC) probably enhances PCDD/Fs solubility.