Phosphine |
NO.7 |
| PH3 |  |
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Performance
| Measuring Range |
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| Number of Pump Strokes |
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| Correction Factor |
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| Sampling Time | 1.5 minutes per pump stroke | |||
| Detecting Limit | 0.5 ppm (n = 4) | |||
| Colour Change | White → Pale yellow | |||
| Reaction Principle | 2PH3 + 6HgCl2 + 3H2O → Hg3P2 3HgCl23H2O+6HCl |
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| Coefficient of Variation | 10% (for 5 to 10 ppm), 5% (for 10 to 50 ppm) | |||
| Shelf Life | 3 Years | |||
| Corrections for temperature & humidity | Unnecessary | |||
| Store the tubes at cool and dark place. | ||||
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Arsine | 20 ppm | + | Brown |
| Hydrogen selenide | 20 ppm | + | Brown |
| Hydrogen sulphide | 10 ppm | + | Dark brown |
| Calibration gas generation | High pressure gas cylinder method |
| TLV-TWA | TLV-STEL | Explosive range |
| 0.3 ppm | 1 ppm | - |
