Methyl Iodide Detection Tubes (0.5 to 108 ppm)
Gastec Detection Tube No. 230 measures Methyl Iodide with a Range of 0.5 to 108 ppm.
- Measuring Range:
- 0.5 to 1 ppm
- (1) to 20 ppm
- 20 to 46 ppm
- 46 to 108 ppm
- Number of Pump Strokes: 4, 2, 1, 1/2
- Correction Factor: 0.5, 1, 2.3, 5.4
- Sampling Time: 1.5 minutes per pump stroke
- Detecting Limit: 0.2 ppm (4 pump strokes)
- Changes from White to Gray
- Corrections for temperature & humidity: Temperature correction is necessary
- Reaction Principle:
- CH3I + I2O5 + V2O5 + H2SO4 → I2
- I2 + 3,3',5,5'-Tetramethylbenzidine → Reaction Product
- Relative Standard Deviation: 5% (for 1 to 20 ppm)
- 2 Year Shelf Life (in the refrigerator)
- Store the tubes in the refrigerator to keep at 10ºC (50ºF) or below.
Possible coexisting substances and their interferences:
| Substance |
Concentration |
Interference |
Changes color by itself to |
| Chlorine |
≧ 1/1 |
+ (Two Layers) |
Brown (turns pale blue after a few minutes) |
| Nitrogen dioxide |
≧ 1/1 |
- (Two Layers) |
Pink |
| Methyl bromide |
≦ 30 ppm |
No |
No |
| Dichloromethane |
≦ 50 ppm |
No |
No |
| Carbon dioxide |
≦ 1 % |
No |
No |
Methyl Iodide Detection Tubes (0.5 to 108 ppm)
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