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June 2012

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From:
John Hunt <[log in to unmask]>
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Date:
Wed, 13 Jun 2012 12:08:58 -0400
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JEOL Probe Users Listserver

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*

Brian,
	I recall that someone published (or at least spoke about) a
procedure for doing this at an MAS conference in the 1980s, I believe.  I
recall that they added some type of paint additive for white color (it was
either a lead oxide or a titanium oxide).  They did it before polishing so
they could distinguish plucking from original voids or something like that.
I have notes about it somewhere, but have never actually done it.

John Hunt
Cornell University

-----Original Message-----
From: JEOL-Focused Probe Users List [mailto:[log in to unmask]] On
Behalf Of Brian Joy
Sent: Tuesday, June 12, 2012 3:30 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

--
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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