Isobutyl acetate CH3CO2CH2CH(CH3)2
(i-CH3CO2C4H9)		 NO.144


Performance

Measuring Range

10 to 300 ppm

Number of Pump Strokes

2

Correction Factor

1

Sampling Time

4 minutes per pump stroke

Detecting Limit

2 ppm (n=2)

Color Change

Yellow Blackish brown Pale blue after few minutes

Reaction Principle

Isobutyl acetate reduces cromic acid to produce blackish brown.
Coefficient of Variation

15% (for 10 to 100 ppm), 10% (for 100 to 300 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 color by itself

Alcohols

 -

Plus error

Produce blackish brown
then turns to pale blue

Ketones

 -

Plus error

Produce blackish brown
then turns to pale blue

Esters

 -

Plus error

Produce blackish brown
then turns to pale blue


Calibration gas generation Diffusion tube method


TLV-TWA TLV-STEL Explosive range
150ppm - 1.3 to 10.5%


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