Carbon disulfide CS2 NO.13


Performance

Measuring Range

0.63 to 1.25 ppm

1.25 to 2.5 ppm

2.5 to 50 ppm

50 to 100 ppm

Number of Pump Stroke

4

2

1

1/2

Correction Factor

1/4

1/2

1

2

Sampling Time

3 minutes per pump stroke

Detecting Limit

0.3 ppm (n=4)

Color Change

Blue Yellow

Reaction Principle

Carbon disulfide is oxidized by nascent oxygen, which is generated by the reaction of chromic acid and sulfuric acid to sulfur dioxide. Sulfur dioxide neutralizes barium chloride, discoloring pH indicator to yellow.

CS2 + CrO3 + H2S2O7 SO2 + CO2
SO2 + BaCl2 + H2O BaSO3+ 2HCl
HCl + Base Chlorides
Coefficient of Variation 10% (for 2.5 to 10 ppm), 5% (for 10 to 50 ppm)
Shelf Life 3 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

Changes color by itself to

Ammonia

 -

No effect

No discoloration

Hydrogen cyanide

 -

No effect

No discoloration

Sulfur dioxide

1/ 5 time

Plus error

Produces yellow stain
Hydrogen sulfide 200 ppm Plus error Produces yellow stain


Calibration gas generation Diffusion tube method


TLV-TWA TLV-STEL Explosive range
10ppm - 1.3 to 50%

Copyright(c) 2001 GASTEC CORPORATION. All rights reserved.