苯氣體檢測管121SP C6H6 的詳細(xì)介紹
苯氣體檢測管121SP C6H6
Benzene                      No.121SPC6H6
Performance
 
Measuring Range
0.5 to 10 ppm
Number of Pump Strokes
3
Correction Factor
1
SamplingTime
1.5 minutes per pumpstroke
DetectingLimit
0.2 ppm (n=3)
ColorChange
White → Brown
ReactionPrinciple
2C6H6+ HCHO → C6H5CH2C6H5 + H2O
C6H5CH2C6H5 + H2S2O7 → Condensation poiymer
Coefficient ofVariation 10% (for 0.5 to 3ppm), 5% (for 3 to 10 ppm)
ShelfLife 2 Years
Correctionsfor
temperature & humidity Unnecessary
Store the tubes at cool and darkplace.

Possible coexisting substances and theirinterferences (NOTE)


Substance
Concentration
Interference
Change color by itself
Hexane
500 ppm
No effect
No discoloration
Toluene
100 ppm
No effect
No discoloration
Xylene
100 ppm
No effect
No discoloration
Aromatichydrocarbons other than benzene are trapped in the brown layer inthe pretreatment tube.If the pretreatment reagent is entirelyconsumed (whole brown layer turns to dark brown),ahigher reading will be given.