sulphur dioxide so no · 2021. 6. 7. · sulphur dioxide so2 no.5ec 2 5 10 20 30 40 ppm 5ec so2 ＋...
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Sulphur dioxide SO2 No.5EC
ppm
5EC2 5 40302010
SO2 ＋ I2 ＋ H2O → 2HI ＋ H2SO4
Reaction principle
Possible coexisting substances and their interferences
Nitrogen dioxide −（unclear demarcation） Hydrogen sulphide ≧ 1/10 ＋ White（unclear demarcation）
Substance Concentration Interference Changes colour by itself to
Permeation tube methodCalibration gas generation
0.4 ppm（1 pump stroke）Purple → WhiteTemperature 0 to 40 ℃ (32 to 104 ℉) correction usedRelative humidity 0 to 90 % correction not used10 %（for 2 to 10 ppm）, 5 %（for 10 to 40 ppm）10 tubes for 10 tests36 months
Detecting limit :Colour change :Operating conditions :
Relative standard deviation :Tube quantity and number of tests per box :Shelf life :
Performance
2 to 40 ppm 1（50mL） 1 45 sec
Measuring rangeNumber of pump strokesCorrection factorSampling time
Scale
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