| 标准分类 Standards |
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| 中文名称：空气中挥发性有机化学品监测用吸附剂、取样参数和热解吸分析条件的选择标准实施规程 |
| 标准号:ASTM D6196-2015e1 |
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| 标准号： |
ASTM D6196-2015e1 |
| 英文名称： |
Standard Practice for Choosing Sorbents, Sampling Parameters and Thermal Desorption Analytical Conditions for Monitoring Volatile Organic Chemicals in Air |
| 中标分类： |
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| 发布日期： |
2015 |
| 发布单位： |
US-ASTM |
| 标准状态： |
请与本站工作人员进行确认 |
| ICS分类： |
环境空气>>环境空气 |
| 起草单位/标准公告： |
D22.05 |
| ***： |
Prac |
| 页数： |
31P.;A4 |
| 附注： |
2015年修改e1 |
| 内容提要（EN）： |
Place the sorbent or carrier tube in a compatible thermal desorption apparatus. As each tube in turn is sealed into the analytical flow path, system integrity should be checked to ensure there are no leaks which could lead to sample losses. Purge the air from each tube before heat is applied to avoid chromatographic artifacts arising from oxidation of the sorbent or damage to the chromatographic system. Heat the tube to displace the organic vapors which are passed (usually by means of a focusing (cold) trap ()) to the gas chromatograph by means of a carrier gas stream. The gas flow at this stage shall be the reverse of that used during sampling, that is, the sampling end of the tube should be nearest the gas chromatograph column inlet. The gas flow through the tube should be in the order of 30 to 50 mL/min for optimum desorption efficiency. For the initial air purge, it is usually necessary to use 10&xd7; the tube volume (that is, 20 to 30 mL) of inert gas to completely displace the volume of air (2 to 3 mL) in the tube. However, larger volumes of carrier gas may be required to completely purge air and water from the strongest sorbents (see ). ; ambient air; diffusive sampling; indoor air; pumped sampling; volatile organic compounds; workplace air; |
| 归属： |
美国 |
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