Ethylene oxide is collected on a flexible, inert charcoal wafer treated with hydrogen bromide. The hydrogen bromide converts ethylene oxide to 2-bromoethanol. At the lab, the excess hydrogen bromide is neutralized with sodium carbonate. Then, the 2-bromoethanol is extracted with 90/10 toluene/acetonitrile and analyzed by GC/ECD. No further derivatization is required.
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Note: The sampling rate of the 555 changed with Lot 7F15, July 2015.