sulphuric acid

Measuring Range 0.5 to 5 mg/m3
Number of Pump Strokes 5
Correction Factor 1
Sampling Time 1 minute per pump stroke
Detecting Limit 0.2 mg/m3(n=5)
Colour Change Pale yellow → Reddish purple
Reaction Principle H2SO4 + BaCl2 2HCl
HCl+Base Chloride
Coefficient of Variation 10% (for 0.5 to 2 mg/m3), 5% (for 2 to 5 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 colour by itself to
Hydrogen chloride 0.05 ppm + Reddish purple
Chlorine 0.8 ppm + Reddish purple
sulphur dioxide   No No
Nitrogen dioxide 1 ppm + Reddish purple
Hydrogen fluoride 0.1 ppm + Reddish purple
Calibration gas generation Vaper pressure method
TLV-TWA TLV-STEL Explosive range
0.2mg/m3 - -

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