Phosphine |
NO.7 |
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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![]() ![]() |
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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. |
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 | - |