Ethylene Oxide 1/a		ÿ
Standard Measuring Range:	1 to 15 ppm	ÿ
Number of Strokes (n):	20	ÿ
Time for Measurement:	App. 8 min	ÿ
Standard Deviation:	+/-20 to 30%	ÿ
Colour Change:	white → pink	ÿ
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Ambient Operation Conditions
Temperature:	10 to 30๐C	ÿ
Absolute Humidity:	3 to 15 mg H2O/L	ÿ
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Reaction Principle
a) ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿEthylene Oxide → HCHO
b) HCHO + C6H4 (CH3)2 + H2SO4 → quinoid reaction products
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Cross Sensitivity
Styrene, vinyl acetate and acetaldehyde are indicated with a yellowish brown
discoloration.
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It is impossible to measure ethylene oxide in the presence of ethylene glycol and
formaldehyde because they produce the same discoloration.
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Additional Information
The reagent ampoule must be broken before carrying out the measurement.

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