甲醛檢測管91 Formaldehyde HCHO 的詳細(xì)介紹
 甲醛檢測管91 Formaldehyde HCHO
Formaldehyde           No.91HCHO
Performance
 
Measuring Range
2 to 20ppm
20 to 50ppm
50 to 100ppm
Number of Pump Strokes
2
1
1/2
Correction Factor
1
2.5
5
Sampling Time
1 minute per pump stroke
Detecting Limit
0.5 ppm (n=2)
Color Change
White → Brown
Reaction Principle
HCHO + C6H4(CH3)2 + H2S2O7 → Condensation Polymer
Coefficient of Variation 15% (for 2 to 6 ppm), 10% (for 6 to 20 ppm)
Shelf Life 3 Years
Corrections for
temperature & humidity Unnecessary
Store the tubes at cool and dark place.

Possible coexisting substances and their interferences (NOTE)


Substance
Concentration
Interference
Change color by itself
Aldehydes
1/2 time
Plus error
Produce brown stain
Esters, Ethers
1000 ppm
Plus error
No discoloration
Ketones
1000 ppm
Plus error
No discoloration
Styrene
500 ppm Plus error
Yellow at 500 ppm