Chemical Forums
Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: Ales on February 06, 2018, 03:25:22 PM
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Hello, do you have any idea about the origin of brown contamination that is located on the coated part of my experimental glass.
I consider about furnace contamination, but I am not sure (84% of Zn, Sn).
Brown contamination on the surface of the glass - SEM EDX:
Mon Sep 18 12:47:59 2017
Filter Fit Chi-squared value: 9.434
Correction Method: Proza (Phi-Rho-Z)
Acc.Voltage: 15.0 kV Take Off Angle: 31.5 deg
Element Element Atom % Compnd Norm.
Wt.% Formula Compnd
C --- --- CO2 ---
O 23.81S 57.69 ---
Mg --- --- MgO ---
Al 1.09 1.56 Al2O3 2.06
Si 1.81 2.50 SiO2 3.88
S 1.15 1.40 SO3 2.88
Ca 2.52 2.44 CaO 3.52
Fe 2.43 1.69 Fe2O3 3.47
Zn 40.41 23.96 ZnO 50.30
Ag 0.57 0.20 Ag2O 0.61
Sn 26.20 8.56 SnO2 33.27
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Do you have any suggestions?
I would appreciate any help.
Thanks,
Mystique
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My first guess is a heavy metal sulfide. From the list you gave, tin sulfide would be my first guess.
I'm used to stand alone edxrf, not the sem xrf. Can you increase the voltage on your unit to detect more elements? Maybe there is another element present.
Good luck