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苯氣體檢測管121S Benzene C6H6 的詳細(xì)介紹苯氣體檢測管121S Benzene C6H6
Benzene No.121S
MeasuringRange
2 to 5 ppm
5 to 120 ppm
120 to 312 ppm
Number of PumpStrokes
4
2
1
CorrectionFactor
0.4
1
2.6
Sampling Time
2 minutes per pumpstroke
Detecting Limit
0.5 ppm (n=4)
Color Change
White → Darkgreen
Reaction Principle
C6H6 + I2O5 + H2S2O7 → I2
Coefficient ofVariation20% (for5 to 40 ppm)， 15% (for 40 to 120 ppm)ShelfLife3YearsCorrectionsforSubstance
Concentration
Interference
Change color by itself
Hexane
100 ppm
No effect
No discoloration
Toluene
200 ppm
No effect
No discoloration
Xylene
300 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.
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