Propyl acetate

Measuring Range 20 to 500 ppm
Number of Pump Strokes 2
Correction Factor 1
Sampling Time 4 minutes per pump stroke
Detecting Limit 4 ppm (n=2)
Colour Change Yellow → Blackish brown → Pale blue after few minutes
Reaction Principle CH3CO2CH2CH2CH3 + Cr6+ + H2SO4 → Cr3+
Coefficient of Variation 15% (for 20 to 100 ppm), 10% (for 100 to 500 ppm)
Shelf Life 2 Years
Corrections for temperature & humidity Temperature correction is necessary
Store the tubes at cool and dark place.
Possible coexisting substances and their interferences (NOTE)
Substance Concentration Interference Change colour by itself to
Alcohols   + Dark brown (few minutes later)
pale blue
Ketones   + Dark brown (few minutes later)
pale blue
Esters   + Dark brown (few minutes later)
pale blue
Calibration gas generation Diffusion tube method
TLV-TWA TLV-STEL Explosive range
200 ppm 250 ppm 1.7 to 8%

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