Acetaldehyde |
NO.92M |
| CH3CHO |  |
 |
Performance
| Measuring Range |
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| Number of Pump Strokes |
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| Correction Factor |
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| Sampling Time | 1.5 minutes per pump stroke | ||
| Detecting Limit | 0.25 ppm (n=2) | ||
| Colour Change | Yellow → Red | ||
| Reaction Principle | 3CH3CHO + (NH2OH)3H3PO4 → H3PO4 H3PO4 + Base → Phosphate |
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| Coefficient of Variation | 10% (for 5 to 20 ppm), 5% (for 20 to 100 ppm) | ||
| Shelf Life | 2 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 |
| Ammonia |  |
No | |
| Acrolein | 3/5 times | + | Red |
| Acetone | 2 times | + | Red |
| Methyl ethyl ketone | 6 times | + | Red |
| MIBK | 10 times | + | Red |
| Calibration gas generation | Diffusion tube method |
| TLV-TWA | TLV-STEL | Explosive range |
| - | C 25 ppm | 4 to 60% |
