|
|
| Tetrachloroethylene |
Cl2C:CCl2 |
NO.133D |
| Performance |
Measuring
Range
|
3 to 150 ppm |
Sampling Hours
|
1 to 8 hours |
Color Change
|
Yellow ---> Purple |
| Reaction
Principle |
Perchloroethylene
is oxydized by sulfuric acid to generate
hydrogen chloride to change the indicator to purple.
Cl2CCl2 + PbO2 + H2SO4 ---> HCl
HCl + Base ---> Chloride products |
| Coefficient
of Variation |
15% (for 25 to
50 ppm-hr), 10% (for 50 to 150 ppm-hr) |
| Shelf
Life |
1 Years |
| Corrections
for temperature & humidity |
Temperature correction
is necessary |
| Store the
tubes in the refrigerator to keep at 10oC (50oF) or below. |
| Possible
coexisting substances and their interferences |
Substance
|
Concentration
|
Interference |
Change
color by itself |
Hydrogen chloride, Chlorine
|
-
|
Plus error
|
Produce purple
discoloration. |
1,2Dichloroethylene,
Trichloroethylene
|
-
|
Plus error
|
Produce purple
discoloration. |
Toluene, Xylene
|
- |
No effect
|
No discoloration |
| Calibration
gas generation |
Permeation tube method |
TLV-TWA
|
TLV-STEL
|
Explosive
range |
| 25ppm |
100ppm |
- |
|
