Development and Validation of a Canister Method for Measuring Ethylene Oxide in Ambient Air
| Autor: | Bart Eklund, Molly Isbell, L Wade Bontempo, Karl R. Loos, C Herndon Williams |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Ethylene Oxide
Detection limit chemistry.chemical_classification Air Pollutants Ethylene oxide Analytical chemistry Reproducibility of Results chemistry.chemical_element Mineralogy General Chemistry Nitrogen Toluene Gas Chromatography-Mass Spectrometry Matrix (chemical analysis) chemistry.chemical_compound chemistry Environmental Chemistry Volatile organic compound Gas chromatography Benzene Environmental Monitoring |
| Zdroj: | Environmental Science & Technology. 38:4200-4205 |
| ISSN: | 1520-5851 0013-936X |
| DOI: | 10.1021/es049861o |
| Popis: | A sampling and analytical method for measuring ethylene oxide (EO) in ambient air was developed and evaluated. The method is based on the use of evacuated canisters and gas chromatography-mass spectrometry (GC-MS). The objectives of this work were to characterize the performance of the method with respect to the following: (1) stability/recovery of ethylene oxide in a canister over a 15-day holding time; (2) detection capability; and (3) measurement of EO in an ambient air matrix. Both electropolished and silica-lined stainless steel canisters were evaluated in this study. The method evaluation involved both laboratory and field tests. The recovery of the EO was evaluated both on an absolute basis and relative to a spiked internal standard of toluene. EO spiked at levels of 2 ppbv and 20 ppbv was found to be stable for holding times of up to 15 days at 25 degrees C in both a humidified nitrogen matrix and in ambient air. The detection limit of the method was found to be 0.25 ppbv using EPA's traditional approach of seven replicate analyses of a low-level standard and 0.20 ppbv using a probability-based approach. EO recoveries in the laboratory stability study generally were 100 +/- 25%, and did not vary by canister type, nor did the EO recoveries decrease with holding time. Field studies demonstrated that the method is capable of detecting EO (as well as benzene and toluene) in an ambient air matrix. |
| Databáze: | OpenAIRE |
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