Hydrogen cyanide

NO.12LL
HCN
Performance
Measuring Range 0.2 to 7 ppm
Number of Pump Strokes 2
Correction Factor 1
Sampling Time 2 minutes per pump stroke
Detecting Limit 0.05 ppm (n=2)
Colour Change Yellow → Pink
Reaction Principle 2HCN + HgCl2 → Hg(CN)2 + 2HCl
HCl + Base → Chloride product
Coefficient of Variation 10% (for 0.2 to 2 ppm), 5% (for 2 to 7 ppm)
Shelf Life 2 Years
Corrections for temperature & humidity Humidity 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 sulphide 1 ppm + Red
sulphur dioxide 1 ppm + Red
Calibration gas generation Permeation tube method
TLV-TWA TLV-STEL Explosive range
- C 4.7 ppm 5.6 to 40%


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