| CCl4 |
 |
Performance
| Measuring Range |
| 0.5 to 2.5 ppm |
2.5 to 60 ppm |
|
| Number of Pump Strokes |
|
| Correction Factor |
|
| Sampling Time |
1.5 minutes per pump stroke |
| Detecting Limit |
0.2 ppm (n=5) |
| Colour Change |
White → Yellow |
| Reaction Principle |
CCl4 + I2O5 + H2S2O7 → COCl2
COCl2 + (CH3)2NC6 H4CHO→ (CH3)2NC6 H4Cl2
(CH3)2NC6 H4Cl2 + (C6H5)2NH → Yellow product
|
| Coefficient of Variation |
15% (for 2.5 to 20 ppm), 10% (for 20 to 60 ppm) |
| Shelf Life |
1 Years |
| Corrections for temperature & humidity |
Unnecessary |
| Store the tubes in the refrigerator to keep at 10ºC (50ºF) or below. |
Possible coexisting substances and their interferences
(NOTE)
| Substance |
Concentration |
Interference |
Change colour by itself to |
| Hydrogen chloride |
100 ppm |
+ |
Yellow |
| Chlorine, Bromine |
50 ppm |
+ |
Yellow |
| Vinyl chloride, Methylene chloride |
|
No |
No |
| Chloroform |
|
No |
No |
| Methyl bromide |
100 ppm |
+ |
Yellow |
| Tetrachloroethylene |
|
No |
No |
| 1,1,1-Trichloroethane |
100 ppm |
+ |
Yellow |
| Trichloroethylene |
|
No |
No |
Other substance measurable with this detector tube
| Substance |
Correction Factor |
No. of pump strokes |
Measuring Range |
| Chloropicrin |
1.0 |
1 |
25 to 60 % |
| Calibration gas generation |
Diffusion tube method |
| TLV-TWA |
TLV-STEL |
Explosive range |
| 5 ppm |
10 ppm |
- |
