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Methyl bromide (CH3Br)
Item Item Details
(Price is for domestic US market only)
Methyl bromide (CH3Br)
Item Name:
Methyl bromide (CH3Br)
Item #:
GAS-136H

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Methyl bromide CH3Br NO.136H


Performance

Measuring Range

10 to 20ppm

20 to 300ppm

300 to 600ppm

Number of Pump Stroke

2

1

1/2

Correction Factor

1/2

1

2

Sampling Time

2 minutes per pump stroke

Detecting Limit

4 ppm (n=2)

Color Change

White  Yellow

Reaction Principle

Methyl bromide is oxidized by nascent oxygen to liberate bromine.
It reacts with o-tolidine to produce yellow stain.

Coefficient of Variation 10% (for 20 to 100 ppm), 5% (for 100 to 300 ppm)
Shelf Life 3 Years
Corrections for
temperature & humidity
Unnecessary
Store the tubes at cool and dark place.


Possible coexisting substances and their interferences (NOTE)

Substance

Concentration

Interference

Change color by itself

Cl2, Br2, NOx

-

Plus error

Produce yellow stain

Saturated halogenated HCs

-

Plus error

Produce yellow stain


Other substance measurable with this detector tube

Substance

Correction Factor

Pump Strokes

Measuring Range

Chlorobromomethane

0.9

1

18 to 270 ppm

1,2-Dibromoethane

0.7

1

14 to 210 ppm

n-Butyl Bromide

1.2

1

24 to 360 ppm


Calibration gas generation Permeation tube method


TLV-TWA TLV-STEL Explosive range
1ppm - 10 to 15%
 
Range 10-600


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