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Details
1.1 ,This test method is for the measurement of mercaptans (organic thiols) in the atmosphere at concentrations below 100 parts per billion (ppb(v) = 195 μ,g/m3). For concentrations above 100 ppb(v), the sampling period can be reduced or the trapping liquid volume increased either before or after aspirating. (See Practice D1357 for sampling guidance.) The minimum detectable amount of methyl mercaptan is 0.04 μ,g/mL (1)2 in a final liquid volume of 25 mL. When sampling air at the maximum recommended rate of 2 L/min for 2 h, the minimum detectable mercaptan concentration is 1.0 ppb(v) (1.95 μ,g methyl mercaptan/m3 at 101.3 kPa (760 mm Hg) and 25°,C). This test method determines total mercaptans and does not differentiate among individual mercaptans, although it is most sensitive to the lower molecular weight alkanethiols.
1.2 ,The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 ,This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in 8.7, 8.8, and Section 9.
1.4 ,This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Significance and Use:
5.1 ,Mercaptans are odorous substances offensive at low concentrations and toxic at higher levels. They are emitted from geothermal sources, industrial processes, and food processing facilities. Mercaptans at low concentrations are commonly added to natural gas and LP gases for safety purposes as well.
Additional Info
| Author | American Society for Testing and Materials (ASTM International) |
|---|---|
| Committee | D22.03 - Committee D22 on Air Quality |
| Published by | ASTM |
| Document type | Standard |
| Theme | ,Ambient atmospheres |
| ICS | 13.040.20 : Ambient atmospheres
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| Number of pages | 4 |
| Replace | ASTM D2913-14 + Redline |
| Set | ASTM Volume 11.07 - Multi-User - Single-Site Online |
| Document history | ,,, |
| Keyword | D2913 |
