Method 49

Ethylene Oxide by Passive Monitor

This method describes the sample collection and analysis of ethylene oxide. Samples are collected by exposing 3M Ethylene Oxide Monitors #3551 for a measured period of time. Samples are desorbed with tetrahydrofuran. An aliquot of the desorbed sample is derivatized with heptafluorobutyric acid anhydride. The derivative is analyzed by gas chromatography using electron capture detection. The monitor is a badge containing a chemically treated charcoal disk which converts adsorbed ethylene oxide to 2-bromoethanol (it is presumed the charcoal is impregnated with hydrogen bromide). Ethylene oxide is collected by diffusion, thus no sampling pumps are needed, but a minimum air velocity must exist during sampling to assure that badge starvation does not occur. The 2-bromoethanol formed on the sampler is less likely to migrate than ethylene oxide.



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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   Recovery remained above 78% after 15 days of storage @ 2°C and 20-26°C.
Preservatives:   Keep refrigerated or at ambient temperature.
Required Preps:   Samples are collected on 3M Ethylene Oxide Monitors, which contain a chemically treated charcoal disk.
Collection Method:   Ethylene oxide monitors: 49.3 mL/min @ 1atm and 25°C, with an air velocity of 15ft/min for area samples.
Analytical Methodology:   GC/ECD
Documentation:   049

Analyte List*

Analyte Formula CAS Number Detection Limit
Ethylene oxide

* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.