Phosphine

 NO.7J
PH3
Performance
Measuring Range
2.5 to 25 ppm 25 to 500 ppm 500 to 1000 ppm
Number of Pump Strokes
2 to 10 1 1/2
Correction Factor
1/2 to 1/10 1 2
Sampling Time 1 minute per pump stroke
Detecting Limit 1 ppm (n = 10)
Colour Change White → Pale yellow
Reaction Principle 2PH3 + 6HgCl2 + 3H2O → Hg3P2 3HgCl23H2O+6HCl
Coefficient of Variation 10% (for 2.5 to 100 ppm), 5% (for 100 to 500 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 1/3 time + Brown
Hydrogen selenide 1/5 time + Brown
Hydrogen sulphide 1/5 time + Dark brown
Calibration gas generation High pressure gas cylinder method
TLV-TWA TLV-STEL Explosive range
0.3 ppm 1 ppm -


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