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t"; lt t$;t.:_{:t'_. This paper discusses the feasibility for use of surfactant solubilizing agsnts to enhance the solubility and the rate of microbial degradation of hydrophobic organic solutes in soil-water suspensions, Hydrophobic organic contaminants are strongly sorbecl to soil or sediment material, and as a consequence the rate of microbial degradation may depend greatly on the desorption of the sorbed-phase contaminant and the accessibility of the contaminant to soil microorganisms. Chemical solubilizing agents may enhance the rate of hydrophobic organic solute degradation by increasing the rate of solute desorption from soil and the extent of solute partitioning to the aqueous phase, The presentation will review on-going research on: (i) surfac'ant solubilization of polycyclic aromatic hydrocarbon (PAH) compounds in clean water, and in soil-water suspensions; and (ii) experiments to assess if the addition of surfactant to soil-water suspension results in faster rate of mineralization of PAH compounds in soil, The presentation explains the methodology employed to select various surfactants for use in the experiments. Experimental results presented show the equilibrium part;'tioning of phenanthrene, anthracene and pyrene in soil-water suspensions, A preliminary model is shown which describes some of the features of the solubilization process.

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This paper discusses the feasibility for use of surfactant solubilizing agsnts to enhance the solubility and the rate of microbial degradation of hydrophobic organic solutes in soil-water suspensions, Hydrophobic organic contaminants are strongly sorbecl to soil or sediment material, and as a consequence the rate of microbial degradation may depend greatly on the desorption of the sorbed-phase contaminant and the accessibility of the contaminant to soil microorganisms. Chemical solubilizing agents may enhance the rate of hydrophobic organic solute degradation by increasing the rate of solute desorption from soil and the extent of solute partitioning to the aqueous phase, The presentation will review ongoing research on: (i) surfac'ant solubilization of polycyclic aromatic hydrocarbon (PAH) compounds in clean water, and in soil-water suspensions; and (ii) experiments to assess if the addition of surfactant to soil-water suspension results in faster rate of mineralization of PAH compounds in soil, The presentation explains the methodology employed to select various surfactants for use in the experiments. Experimental results presented show the equilibrium part;'tioning of phenanthrene, anthracene and pyrene in soil-water suspensions, A preliminary model is shown which describes some of the features of the solubilization process. Currently work is in progress to evaluate the rate of evolution of _4CO2 from soil-water suspensions using 14C-labeled phenanthrene and surfactants, The tests are being per4ormed with acclimated PAH-degrading organisms. The experimental protocols for this work will be reviewed.