Ethylene Oxide Vapor Monitor

Method:

The ethylene oxide monitor badge contains a chemically activated carbon molecular sieve absorbant. When exposed to ethylene oxide vapor, it forms a brominated derivative of ethylene oxide. The analysis is done by gas chromatography.

Reference Method of Analysis:

OSHA Method 50.


Specifications

OSHA Exposure Limit

1.0 ppm for an 8 hour period (PEL)
5.0 ppm for a 15 minute (STEL)

Recommended Sampling Time

15 minutes to more than 8 hours.

Minimum Level of Quantitation

0.1 micrograms per sample. This is equivolent to less than 0.01 ppm for an 8 hour period and 0.2 ppm for 15 minutes.

Interferences

Alcohols, aldehydes, and ketones will not interfere. No interferences are known.

Sampling Rate

56 ml/minute

Accuracy

Overall System Accuracy with 95% confidence.
Limits:
  • 0.2% at 1.0 ppm for 8 hours.
  • 13.0% at 5.0ppm for 15 minutes.

    • Effects of Temperature

    Less than 10% for each 10°C change from 24°C.

    Effects of Humidity

    No effects detected from 30% Relative Humidity to 85% Relative Humidity at 24°C.

    Storage Conditions

    Pre-Exposure: Minimum shelf-life is one year prior to use. There are no special storage required. For optimal results, store the badge away from sources of Ethylene Oxide.
    Post-Exposure: Analysis after exposure should be done within 2 weeks.