tert-Butyl mercaptan (CH3)3CSH NO.75
75


Performance

Measuring Range

2.5 to 30 mg/m3

30 to 60 mg/m3

60 to 150 mg/m3

Number of Pump Stroke

2

1

1/2

Correction Factor

1

2

5

Sampling Time

1.5 minutes per pump stroke

Detecting Limit

0.5 mg/m3 (n=2)

Color Change

Yellow Red

Reaction Formula

tert-Butyl Mercaptan reacts with mercuric chloride to liberate
hydrogen chloride which discolors the indicator to purple.
(CH3)3CSH +HgCl2 (CH3)3CSHgCl + HCl
HCl + Basic compounds Chlorides
Coefficient of Variation 10% (for 2.5 to 10 mg/m3), 5% (for 10 to 30 mg/m3)
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

Hydrogen sulfide

 -

Plus error

Produce red stain

Phosphine

 -

Plus eror

Produce red stain

Other mercaptans

 -

Plus error

Produce red stain

Calibration gas generation Diffusion tube method


TLV-TWA TLV-STEL Explosive range
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