Carbonyl sulphide

NO.21
COS
Performance
Measuring Range
5 to 10 ppm 10 to 100 ppm 100 to 200 ppm
Number of Pump Strokes
2 1 1/2
Correction Factor
1/2 1 2
Sampling Time 3 minutes per pump stroke
Detecting Limit 1 ppm (n=2)
Colour Change Blue → Yellow
Reaction Principle COS + I2O5 + H2SO4 → SO2 + CO2
SO2 + BaCl2 + H2O → BaSO3+ HCl
HCl + Base → Chloride
Coefficient of Variation 10% (for 10 to 30 ppm), 5% (for 30 to 100 ppm)
Shelf Life 2 Years
Corrections for temperature & humidity Unnecessary
Store the tubes in the refrigerator to keep at 10ºC (50ºF) or below.
Possible coexisting substances and their interferences (NOTE)
Substance Concentration Interference Change colour by itself to
Carbon disulphide   + Yellow
sulphur dioxide   + Yellow
Butane 5000 ppm No
Propane 5000 ppm No
Calibration gas generation High pressure gas cylinder method
TLV-TWA TLV-STEL Explosive range
- - 12 to 19%


Return to previous viewGo to top of page