sulphuric acid |
NO.35 |
| H2SO4 |  |
 |
Performance
| 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 ¡ä 2HCl HCl+Base ¡ä 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 | ¡æ 0.05 ppm | + | Reddish purple |
| Chlorine | ¡æ 0.8 ppm | + | Reddish purple |
| sulphur dioxide | No | No | |
| Nitrogen dioxide | ¡æ 1 ppm | + | Reddish purple |
| Hydrogen fluoride | ¡æ 0.1 ppm | + | Reddish purple |
| Calibration gas generation | Vaper pressure method |
| TLV-TWA | TLV-STEL | Explosive range |
| 0.2mg/m3 | - | - |
