An electron capture detector (ECD) is a device for detecting atoms and molecules in a gas through the attachment of electrons via electron capture ionization. The device was invented in 1957 by James Lovelock and is used in gas chromatography to detect trace amounts of chemical compounds in a sample. ==Gas chromatograph detector== The electron cap...
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http://en.wikipedia.org/wiki/Electron_capture_detector
(from the article `chromatography`) ...to hydrocarbons, but it will not detect carrier gases, such as nitrogen, or highly oxidized materials, such as carbon dioxide, carbon monoxide, ...
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http://www.britannica.com/eb/a-z/e/19
In sample analysis, uses a radioactive source to ionise the carrier gas inside a chamber. This induces the gas to produce a steady stream of ions which can be measured as a steady current whose strength depends on the gas component and its concentration.
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http://www.encyclo.co.uk/local/20474
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