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Acetaldehyde CH3CHO No.92L
3CH3CHO +(NH2OH)3・H3PO4 → H3PO4
H3PO4 + Base → Phosphate
Reaction principle
Diffusion tube methodCalibration gas generation
0.2 ppm(1 pump stroke)Yellow → Reddish brownTemperature 5 to 40 ℃ (41 to 104 ℉) correction used Relative humidity 20 to 90 % correction not used10 %(for 1 to 6 ppm), 5 %(for 6 to 20 ppm)10 tubes for 10 tests24 months(in the refrigerator)
Detecting limit :Colour change :Operating conditions :
Relative standard deviation :Tube quantity and number of tests per box :Shelf life :
Performance
1 to 20 ppm 1(100 mL) 1 2 min
Measuring rangeNumber of pump strokesCorrection factorSampling time
Possible coexisting substances and their interferences
Ammonia ≦ 30ppm No No Acetic acid ≧ 2 times + Reddish brownAcids + Reddish brownAldehydes + Reddish brownKetones + Reddish brown
Substance Concentration Interference Changes colour by itself to
1 2 4 6 8 10 12 14 16 18 20 ppm
n=1
92LScale