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RECORD NUMBER: 221 OF 1146

OLS Field Name OLS Field Data
Main Title Developments in the Supercritical Fluid Extraction of Chlorophenoxy Acid Herbicides from Soil Samples.
Author Lopez-Avila, V. ; Dodhiwala, N. S. ; Beckert, W. F. ;
CORP Author Midwest Research Inst., Mountain View, CA. California Operations.;Environmental Monitoring Systems Lab., Las Vegas, NV.
Publisher c1993
Year Published 1993
Report Number EPA-68-C1-0029; EPA/600/J-94/268;
Stock Number PB94-182326
Additional Subjects Herbicides ; Soil pollution ; Extraction ; Reprints ; Supercritical flow ; Carbon dioxide ; Pollution monitoring ; Remedial action ; Sampling ; EPA SW-846 Method 8151 ; In situ treatment ; Chlorophenoxy acid herbicides
Holdings
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Status
NTIS  PB94-182326 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 09/01/1994
Collation 9p
Abstract
Extraction of chlorophenoxy acid herbicides from soil samples with supercritical carbon dioxide as extractant and tetrabutylammonium hydroxide and methyl iodide as derivatization agents was investigated. The extraction was carried out at 400 atm and 80 degrees C for 15 min static, followed by 15 min dynamic, at a carbon dioxide flow rate of approximately 1.5 mL/min (as liquid). The use of other derivatization agents (trimethylphenylammonium hydroxide, benzyltrimethylammonium chloride, and benzyltriethylammonium chloride) proved to be less effective than the tetrabutylammonium hydroxide/methyl iodide combination. (Copyright (c) 1993 American Chemical Society.)