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I also recall mention of brominated and iodated compounds being added to epoxy to render it brighter. I used a procedure that added about 15% iodoform to epoxy to raise its average number so that I could distinguish it from coal for purposes of image analysis. The presence of iodine should help chemically distinguish it as well.
Warren
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From: JEOL-Focused Probe Users List [mailto:[log in to unmask]] On Behalf Of Wessel, Jeffrey C
Sent: Wednesday, June 13, 2012 1:00 PM
To: [log in to unmask]
Subject: Re: [PROBEUSERS] adding impurity to epoxy
JEOL Probe Users Listserver
Moderator: Ellery Frahm, [log in to unmask],
Electron Microprobe Lab, University of Minnesota
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Hello Brian,
Many of the epoxies that I deal with contain a small amount of Chlorine and I frequently use it as a marker.
I don't know if this would be relevant to your system but I occasionally see Brominated hydrocarbons (sometimes with an Antimony compound) incorporated into epoxy resins. They light up nicely in a back-scattered electron image at much lower beam currents and with much better resolution, (and it's unlikely that either will be present in your test material)
Cheers
Jeff Wessel
Boeing M&PT
Seattle, WA
-----Original Message-----
From: JEOL-Focused Probe Users List [mailto:[log in to unmask]] On Behalf Of Brian Joy
Sent: Tuesday, June 12, 2012 12:30 PM
To: [log in to unmask]
Subject: [PROBEUSERS] adding impurity to epoxy
JEOL Probe Users Listserver
Moderator: Ellery Frahm, [log in to unmask], Electron Microprobe Lab, University of Minnesota
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Hi everyone,
I am working on an X-ray mapping project and would like to identify epoxy that has infiltrated pore spaces and fractures in shale. The complications are 1) the pore spaces are typically no more than a few microns across and 2) carbonaceous material is abundant within the samples. The carbonaceous material always contains some amount of sulfur, and so it can often be distinguished by this means. However, I would like to unambiguously identify epoxy that has infiltrated the sample (or verify that it hasn't infiltrated). Does anyone have experience with adding a tracer element (as a solute?) to epoxy for this purpose? The concentration of the element would need to be great enough that it could be detected via EDS (SDD) in micron-scale pore spaces while using a relatively short dwell time (not much longer than 20 ms, with probe current not exceeding 100 nA). I'd appreciate any advice.
Brian
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Brian Joy
Electron Microprobe and ESEM Lab
Queen's Facility for Isotope Research
Department of Geological Sciences and Geological Engineering Queen's University
36 Union Street
Kingston, Ontario K7L 3N6
cell phone: 530-220-0434
lab phone: 613-533-2595
fax: 613-533-6592
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