I have EDS data (wt% normalized) of metal samples having composition of Fe 79.69, Sn 5.93, C 11.69 and O 2.75 %wt. I want to remove C and O from my data and calculate exact ratio of Fe and Sn. How to do this?
Fe:Sn = 79.69 : 5.93. Normalised Fe (%) = 100*79.69/(79.69+5.93). Similar for Sn.
Or am I missing something here?
If you have the original data and the software, I think you can remove/select the elements that you want to take into account for elemental calculation. Just remove oxygen and carbon, and keep Fe and Sn prior to start your calculation.
Hi,
You can calculate the number of counts excluding elements you don't want to consider in final results as 100%. Then you can take there proportionate and workout the quantitative compositions of C and O.
Cheers
1. Was you specimen carbon coated? If not, then you cannot dismiss C. Sure, some part of it can come from contamination, but not 11%.
2. Reverse calculation is at least problematic. You need to repeat analysis or recalculate from existing spectrum using you EDS software, just remove option of normalization in your setup procedure. Then you do not need to "remove" any elements.
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