Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Solvent minimization in the continuous liquid/liquid extraction of aqueous samples for semivolatile organics /
Author Slayton, J. ; Warner, S. ; Shreiner, P. ; Tulip, C. ; Messer, E.
Other Authors
Author Title of a Work
Slayton, Joseph.
CORP Author Environmental Protection Agency, Annapolis, MD. Central Regional Lab.
Publisher U.S. Environmental Protection Agency, Central Regional Laboratory,
Year Published 1993
Report Number EPA/903/R-93/003
Stock Number PB94-121555
OCLC Number 35112543
Subjects Organic compounds. ; Sampling.
Additional Subjects Solvent extraction ; Pollution abatement ; Liquid wastes ; Waste management ; Extraction apparatuses ; Continuous processing ; Separation processes ; Design criteria ; Performance evaluation ; Environmental tests ; Hazardous materials ; Chloromethanes ; Cost analysis ; Volatile organic compounds ; Comparison ; Laboratories ; Waste minimization ; Continuous extraction
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EMBD  EPA/903/R-93/003 NRMRL/GWERD Library/Ada,OK 07/19/1996
NTIS  PB94-121555 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 07/22/2019
Collation 43 p. : ill. ; 28 cm.
Continuous extraction (CE) of aqueous samples is quickly replacing separatory funnel extraction for semivolatile organics. The advantages of continuous liquid/liquid extraction over separatory funnel extractions include the following: improved extraction efficiencies and accuracy due to the increased number of theoretical plates associated with the re-distilled solvent being continuously exposed to the sample; savings in manpower due to the reduction of both time and physical labor; the effectiveness of the CE technique in highly contaminated matrices containing suspended solids (a problem with Solid Phase Extractions); the effective elimination of emulsions common with separatory funnel extractions of environmental samples; and the improved precision using CE. One disadvantage of the traditional CE procedure is the considerable volume of solvent. Given the overall expense of using methylene chloride, both the initial purchase cost and the extremely costly disposal fee, it would be desirable to miniaturize the procedure in order to minimize the volume of solvent. A design for a miniaturized continuous extractor was developed so as to maintain the sensitivity of the procedure, yet minimize the solvent necessary to perform the analysis. A series of extraction recovery experiments were performed using the prototype extractor design.