Doug,
Agree with what Bob said except for one clarification. You cannot use FTIR for determining hydrogen. It only has one stretch and it is symmetric and FTIR cannot detect molecular vibrations where there is no change in dipole. You can detect H2 with Raman spectroscopy because of the change in polarizability. The stretch comes at 4161.13 wave numbers (as per Kazuo Nakamoto, 2nd edition).
Bev
RIM
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bob Landman
Sent: Thursday, March 17, 2011 2:29 PM
To: [log in to unmask]
Subject: Re: [TN] Hydrogen gas analysis
Doug,
A high resolution mass spec (magnetic sector) such as DuPont or AEI made can determine hydrogen isotopes, as I recall.
Brucker makes a instrument specifically for H2 analysis http://www.bruker-axs.com/g8_galileo.html
MKS makes RGAs and they have a FTIR Infrared gas analyser that are capable of ppb to ppm sensitivity for multiple gas species including NF3, NH3, H2, NO and N2O and gases with as much as 30% water.
Bob Landman
H&L Instruments, LLC
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Thursday, March 17, 2011 12:42 PM
To: [log in to unmask]
Subject: Re: [TN] Hydrogen gas analysis
I considered GC with a flame ionization detector. In looking at the method though, it uses hydrogen as a carrier gas. Could you use helium as a carrier gas and still get the same results? And did you use the columns that Agilent lists or did you use a different column resin?
And the follow up question - do you know of independent test labs which could do the GC testing that you describe?
Doug Pauls
"Karen Tellefsen" <[log in to unmask]>
03/17/2011 11:16 AM
To
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask] cc
Subject
Re: [TN] Hydrogen gas analysis
Gas chromatography.
http://www.chem.agilent.com/Library/applications/5988-9260EN.pdf
Once upon a time I worked on H2 darkening of optical fibers, and I analyzed
H2 with gas chromatograph.
Karen Tellefsen - Electrical Testing
[log in to unmask]
908-791-3069
[TN] Hydrogen gas analysis
Douglas Pauls
to:
TechNet
03/17/2011 11:09 AM
Sent by:
TechNet <[log in to unmask]>
Please respond to TechNet E-Mail Forum, dopauls
Good morning all,
I am posting this question for a colleague (not Hillman).
Take a look at this picture which Steve has graciously posted on his web page.
http://stevezeva.homestead.com/Bowed_Electrolytic.jpg
This is an electrolytic capacitor and I don't have any access to the processing history. Presumably it went through reflow. My colleague would like to determine if there is hydrogen in this swelled device and if so, what percentage. There is presumably both liquid and gas inside the swelled area which would complicate any standard residual gas analysis.
Hydrogen is too light for GCMS detection.
OK all you chemists, how would hydrogen presence and concentration be determined here? And do you know of any commercial labs which would perform that service?
Doug Pauls
Rockwell Collins
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