Mercaptans Detection Tubes (0.5 to 120 ppm)
Gastec Detection Tube No. 70 measures Mercaptans with a Range of 0.5 to 120 ppm.
- Measuring Range: 0.5 to 5 ppm, 5 to 120 ppm
- Number of Pump Strokes: 2 to 10, 1
- Correction Factor: 1/2 to 1/10, 1
- Sampling time: 1.5 minutes per pump stroke
- Detecting Limit: 0.2 ppm (10 pump strokes)
- Changes from White to Yellow
- Corrections for temperature & humidity: Temperature correction is necessary
- Reaction Principle: 2R･SH+ PdSO4 → (RS)2Pd + H2SO4
- Relative Standard Deviation: 10% (for 5 to 40 ppm), 5% (for 40 to 120 ppm)
- 3 Year Shelf Life
- Store the tubes at cool and dark place.
Possible coexisting substances and their interferences:
Substance Concentration Interference Changes color by itself to Acetylene, Ethylene ≧ 2000 ppm + Pale brown (whole layer) Carbon monoxide ≧ 2000 ppm + Pale brown (whole layer) Hydrogen sulfide ≧ 500 ppm + No
Other substance measurable with this detector tube:
Substance: Correction Factor: No. of Pump Strokes: Measuring Range: Ethyl mercaptan 1.0 1 to 10 0.5 to 120 ppm Isopropyl mercaptan 2.0 1 10 to 240 ppm Methyl mercaptan 0.7 1 to 10 0.35 to 84 ppm Propyl mercaptan 4.5 1 22.5 to 540 ppm
Mercaptans Detection Tubes (0.5 to 120 ppm)
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Methyl mercaptan detection: Methyl mercaptan is highly irritant when it contacts moist tissues such as the eyes, skin, and upper respiratory tract. It can also induce headache, dizziness, nausea, vomiting, coma, and death. Ingestion of methyl mercaptan is unlikely since it is a gas at ambient temperatures.
Methyl mercaptan detection, routes of exposure
Inhalation Inhalation is the major route of exposure to methyl mercaptan. An odour threshold of 0.002 ppm has been reported for methyl mercaptan, but olfactory fatigue may occur and thus, it may not provide adequate warning of hazardous concentrations. Vapours of liquified methyl mercaptan gas are heavier than air and spread along the ground. Exposure in poorly ventilated, enclosed, or low-lying areas can result in asphyxiation.
Other routes of exposure come from Skin/Eye contact and Ingestion.
At room temperature (above 43°F), methyl mercaptan is a colourless gas with an unpleasant odour described as rotten cabbage. It is slightly soluble in water. It is generally shipped as a liquified compressed gas. When heated to decomposition, it emits toxic fumes, such as sulfur dioxide, and flammable vapours. Methyl mercaptan should be stored in cool, well ventilated places. The main toxic effect of exposure to methyl mercaptan is irritation of the respiratory airway, skin, and eyes. – Agency for Toxic Substances & Disease Registry
Why do we use methyl mercaptan?
Methyl mercaptan is mainly used to produce methionine, which is used as a dietary supplement for poultry and animal feed. Methyl mercaptan also is used in industrial applications as an intermediate in the production of pesticides, fungicides, plastics and animal feed additives. As an industrial intermediate, the chemical is reacted into something else or fully consumed to make the product.
For short-term measurements more than 160 Draeger-Tubes are available to measure the spot concentrations of specific gases. Measurement usually takes between 4 seconds and 15 minutes. The tubes are used either manually with the Draeger-Tube Accuro Pump or automatically with the Draeger X-act 5000.
A wide range of different gases and vapors can be detected and measured, such as:
- Determining and measuring concentration peaks
- Measuring personal exposure in the inhalation area
- Detecting leaks in pipelines, gas installations etc.
- Air analysis in sewers, shafts and confined spaces
Mercaptan Detection Tubes 0.5/a (0.5 - 5 ppm)
Standard Measuring Range: 0.5 to 5 ppm Number of strokes n: 20 Time for Measurement: approx. 5 min Standard Deviation: ± 10 to 15 % Color Change: white ??> yellow Temperature: 10 to 40°C Absolute Humidity: 3 to 15 mg H2O / L Reaction Principle: 2 R-SH + Pd2+ ??> Pd (RS)2 + 2 H+ Cross Sensitivity: Higher molecular weight alkyl mercaptans (e.g. propyl- and butylmercaptans) are indicated with approximately the same sensitivity. 1,000 ppm ethylene, 2,000 ppm carbon monoxide and 200 ppm hydrogen sulfide do not affect the indication. Hydrogen sulfide discolors the pre-layer black.
Mercaptan Detection Tubes 0.5/a (0.5 - 5 ppm)
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