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You are Here: Short
Term Tubes A, B, M & P 191L |
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Acrylonitrile |
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NO.191L |
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CH2FCHCN |
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Performance |
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Measuring Range |
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0.1 to 0.2 ppm |
0.2 to 6.0 ppm |
6.0 to 18.0 ppm |
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Number of Pump Strokes |
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Correction Factor |
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| Sampling
Time |
3 minutes
per pump stroke |
| Detecting
Limit |
0.05 ppm
(n=4) |
| Colour
Change |
Yellow →
Pink |
| Reaction
Principle |
Pretreatment tube: CH2:CHCN
+ Cr6+ + H2SO4
→ HCN
Detector tube : 2HCN +
HgCl2
→ 2HCl + Hg(CN)2
HCl + Base →
Chloride |
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Coefficient of Variation |
10% (for
0.25 to 1 ppm), 5% (for 1 to
6 ppm) |
| Shelf
Life |
3 Years |
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Corrections for temperature
& humidity |
Unnecessary |
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Store the tubes at cool and
dark place. |
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Possible coexisting substances and
their interferences
(NOTE) |
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Substance |
Concentration |
Interference |
Change colour by itself to |
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Hydrogen chloride |
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No |
No |
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Hydrogen cyanide |
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No |
No |
Nitriles ( C3) |
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+ |
Pink |
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Acetone cyanohidrin |
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+ |
Pink |
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Alcohols, Esters, Ketones |
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No |
No |
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Aromatic hydrocarbons |
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No |
No |
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Other substance measurable with this
detector tube |
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Substance |
Correction Factor |
No. of pump strokes |
Measuring Range |
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n-Butyronitrile |
30 |
1 |
6 to 180 ppm |
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2-Methyl-3-butenenitrile |
2.0 |
2 |
0.4 to 12 ppm |
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2-Pentenenitrile |
1.2 |
2 |
0.24 to 7.2 ppm |
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3-Pentenenitrile |
2.0 |
2 |
0.4 to 12 ppm |
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Calibration gas generation |
Diffusion tube method |
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TLV-TWA |
TLV-STEL |
Explosive range |
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2 ppm |
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3 to 17% |
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Gastec Tubes and
Sampling Pump
