Propyl acetate |
NO.145 |
| CH3CO2CH2CH2CH3(CH3CO2C3H7) |  |
 |
Performance
| Measuring Range | 20 to 500 ppm |
| Number of Pump Strokes | 2 |
| Correction Factor | 1 |
| Sampling Time | 4 minutes per pump stroke |
| Detecting Limit | 4 ppm (n=2) |
| Colour Change | Yellow → Blackish brown → Pale blue after few minutes |
| Reaction Principle | CH3CO2CH2CH2CH3 + Cr6+ + H2SO4 → Cr3+ |
| Coefficient of Variation | 15% (for 20 to 100 ppm), 10% (for 100 to 500 ppm) |
| Shelf Life | 2 Years |
| Corrections for temperature & humidity | Temperature correction is necessary |
| Store the tubes at cool and dark place. | |
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| Alcohols | + | Dark brown
(few minutes later) pale blue |
|
| Ketones | + | Dark brown
(few minutes later) pale blue |
|
| Esters | + | Dark brown
(few minutes later) pale blue |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| 200 ppm | 250 ppm | 1.7 to 8% |
