Electron capture detectors

Chromatography Forum: GC Archives: Electron capture detectors
Top of pagePrevious messageNext messageBottom of pageLink to this message  By Rebecca Waite on Tuesday, September 9, 2003 - 08:41 pm:

Does anyone know why an elctron capture detector that contains Pt or Ti foil saturated with 3H2 does not operate at a temperature above 220 degrees celsius? Thanks


Top of pagePrevious messageNext messageBottom of pageLink to this message  By Anonymous on Wednesday, September 10, 2003 - 01:04 pm:

Rebecca,
At higher temperatures I believe that the tritium will be desorbed from the metal matrix. Not only will it decrease the sensitivity (lower acitivity in the detector) but it will also put the tritium in the air (also not a good thing).

Regards,
Mark


Top of pagePrevious messageNext messageBottom of pageLink to this message  By Anonymous on Monday, December 15, 2003 - 04:22 am:

Yes, the Tritium will be desorbed above 220C, and this is "not a good thing" to do.
But Ni63 ECDs can be heatet up to 350C in this case You can clean up the ECD - with gasflows on!


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