苯氣體檢測管121SP C6H6    的詳細介紹   

苯氣體檢測管121SP C6H6
Benzene                                            No.121SP

C6H6

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

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.