Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Isolation and Concentration of Organic Substances from Water: An Evaluation of Supercritical Fluid Extraction.
Author Ehntholt, D. J. ; Eppig, C. P. ; Thron, K. E. ;
CORP Author Little (Arthur D.), Inc., Cambridge, MA.;Health Effects Research Lab., Research Triangle Park, NC.
Year Published 1984
Report Number EPA-68-03-3001; EPA/600/1-84/028;
Stock Number PB85-138899
Additional Subjects Organic compounds ; Solvent extraction ; Water pollution ; Industrial wastes ; Water analysis ; Extraction ; Chemical properties ; Physical properties ; Trace elements ; Chemical analysis ; Potable water ; Carbon dioxide ; Toxicity ; Concentration(Composition) ; Separation ; Supercritical fluid extraction ; Organic matter ; Water pollution detection ; Procedures
Library Call Number Additional Info Location Last
NTIS  PB85-138899 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 68p
This study describes the use of supercritical fluid carbon dioxide (SCF CO2), as an extraction solvent, for the isolation and concentration of twenty-three specified organic solutes in water at trace levels. This type of direct extraction using a non-toxic, non-hazardous solvent such as carbon dioxide represents a new concept for the isolation and concentration of organic compounds from water. The ability of SCF CO2 system to extract and subsequently trap model solutes, with widely varying chemical and physical properties, was generally found to be lacking. Only four of the model solutes (2,4-dichlorophenol, isophorone, phenanthrene and stearic acid) demonstrated recovery values of greater than 40 percent. The low recoveries were to an inefficient trap system, adsorption, and the inability of supercritical fluid CO2 to extract highly water soluble or alkaline solutes.