Hydrogen cyanide |
NO.12H |
| HCN |  |
 |
Performance
| Measuring Range | 0.05 to 1.6% |
| Number of Pump Strokes | 1 |
| Correction Factor | 1 |
| Sampling Time | 1 minute per pump stroke |
| Detecting Limit | 0.005% (n=1) |
| Colour Change | Yellow → White |
| Reaction Principle | HCN+Na2Pd(SO3)2 → White reaction product |
| Coefficient of Variation | 10% (for 0.05 to 0.4 %), 5% (for 0.4 to 2 %) |
| 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 | Change colour by itself to |
| Carbon monoxide | + | Dark brown | |
| Hydrogen sulphide | + | Dark brown | |
| Ethylene | + | Dark brown |
| Calibration gas generation | High pressure gas cylinder method |
| TLV-TWA | TLV-STEL | Explosive range |
| - | C 4.7 ppm | 5.6 to 40 % |
