Diborane

NO.22
B2H6
Performance
Measuring Range
0.02 to 0.05 ppm 0.05 to 2 ppm 2 to 5 ppm
Number of Pump Strokes
5 2 1
Correction Factor
1/3 1 2.5
Sampling Time 2 minutes per pump stroke
Detecting Limit 0.01 ppm (n=5)
Colour Change Yellow → Red
Reaction Principle Diborane reacts with mercuric chloride to produce hydrogen chloride.
HCl react with indicator to discolour to red.
B2H6 + 6HgCl2 → 2B2(HgCl)3 + 6HCl
HCl + Base → chloride
Coefficient of Variation 10% (for 0.05 to 0.4 ppm), 5% (for 0.4 to 2 ppm)
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
Arsine 1/10 time + Red
Hydrogen selenide 1/10 time + Red
Phosphine 1/10 time + Red
Hydrogen chloride 1/3 time + Red
Calibration gas generation High pressure gas cylinder method
TLV-TWA TLV-STEL Explosive range
0.1 ppm - -


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