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OLS Field Name OLS Field Data
Main Title Foam Prevention in Purge and Trap Analysis.
Author Erickson, Mitchell D. ; Alsup, Martin K. ; Hyldburg, Patricia A. ;
CORP Author Research Triangle Inst., Research Triangle Park, NC.;Environmental Monitoring and Support Lab., Cincinnati, OH.
Year Published 1981
Report Number EPA-68-03-2749; EPA-600/J-81-380;
Stock Number PB82-127366
Additional Subjects Water analysis ; Foam ; Antifoaming agents ; Laboratory equipment ; Revisions ; Sampling ; Organic compounds ; Water pollution ; Chemical analysis ; Reprints ; Water pollution detection ; Procedures
Library Call Number Additional Info Location Last
NTIS  PB82-127366 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 7p
Abstract Volatile organics are often separated from water samples by bubbling an inert gas through the water and collecting the organics on a sorbent trap, a technique known as purge and trap. Unfortunately, during the analysis of many water samples, foam can climb through the apparatus and contaminate the trap. This research project has investigated both chemical and mechanical antifoaming techniques. A total of 27 potential chemical antifoaming agents were evaluated for their ability to control foam. Two silicone-based commercial antifoam emulsions, Dow Corning Antifoam C and General Electric AF-72, were rated superior overall. The final protocol specifies use of 2 drops of purified silicone antifoam emulsion (General Electric AF-72) in a 5.0-mL sample which is purged in a 60-mL purge flask. The procedure was validated with seven volatile compounds (29-159 ng) spiked into four wastewaters. Mean recovery (vs. purge of distilled water) was 97%.
Supplementary Notes Pub. in Analytical Chemistry, v53 n8 p1265-1269 Jul 81.
Title Annotations Reprint: Foam Prevention in Purge and Trap Analysis,
PUB Date Free Form Oct 81
Category Codes 7D; 99A; 68D
NTIS Prices PC A02/MF A01
Document Type NT
Cataloging Source NTIS/MT
Control Number 323807608
Origin NTIS
Type CAT