Raja,
On Sun, Mar 16, 2008 at 3:07 PM, Rajasekaran S
I have a couple of questions on the use of EXAFS:
1. How sensitive is EXAFS/XANES in determining ~ couple of ppm (up to 100ppm) of halogen content in solid content?
It depends, somewhat on what you mean. Probably the simplest answer is: EXAFS/XANES is terrible at telling the halogen content in "solid content". EXAFS/XANES studies one selected element, ignoring those that are not directly bound to the element selected. That it, it would be pretty much useless at telling a Cl/Br ratio. You may want to look into X-ray Fluorescence analysis, which can non-destructively determine elemental abundances. On the other hand, EXAFS/XANES can successfully measure the bonding of Cl and Br when they are at 100ppm or so (perhaps less) in solid content. In my experience, EXAFS/XANES on elements at concentrations of a few ppm is very challenging, though it does depend what the rest of the system is.
2. Also, are there lab-scale EXAFS/XANES equipments available towards this? Anyone working on lab-scale equipments?
There are lab-based EXAFS/XANES systems. I believe Rigaku sells machines for laboratory EXAFS. They may be the only company to do so. Hope that helps, --Matt