Use and efficiency of ethylene glycol monomethyl ether and monoethanolamine to trap volatilized [7-14C]naphthalene and 14CO2
Article first published online: 20 OCT 2009
Copyright © 1992 SETAC
Environmental Toxicology and Chemistry
Volume 11, Issue 2, pages 181–185, February 1992
How to Cite
Abbott, C. K., Sims, R. C. and Sorensen, D. L. (1992), Use and efficiency of ethylene glycol monomethyl ether and monoethanolamine to trap volatilized [7-14C]naphthalene and 14CO2. Environmental Toxicology and Chemistry, 11: 181–185. doi: 10.1002/etc.5620110207
- Issue published online: 20 OCT 2009
- Article first published online: 20 OCT 2009
- Manuscript Accepted: 13 JUN 1991
- Manuscript Received: 22 FEB 1991
- U.S. Environmental Protection Agency. Grant Number: R 814475-01
- Radiolabeled compounds;
- Carbon dioxide
Separation of radiolabeled CO2 from volatile parent compound(s) or degradation products in air from biodegradation microcosms has been done by using solubility in alkaline vs. nonpolar solvents or solutions. However, trapping solvents or solutions used to collect radiolabeled CO2 may absorb some volatile intermediate products or the volatilized parent compound. Similarly, solvents used to trap volatile radiolabeled degradation intermediates or volatile parent compound may absorb some radiolabeled CO2. If this lack of absorption specificity is significant, the clear interpretation of radioactivity-counting analyses may be compromised.
A procedure designed to separate volatilized [7-14C]naphthalene and 14CO2 from the same air stream was evaluated for its efficiency. Ethylene glycol monomethyl ether (EGME) effectively trapped naphthalene (98.6% recovery) but retained approximately 0.8% of the 14CO2, whereas monoethanolamine (MEA):methanol:scintillation cocktail solution trapped approximately 99.5% of the naphthalene and virtually 100% of the CO2. Preliminary studies of the efficiency of trapping solutions for parent compounds and mineralized CO2 should be made before conclusions are made concerning the extent or rate of mineralization based on the amount of radiolabeled carbon retained in a trapping solution.