Hello all, I measured XRD in sieved dried surface soil samples but one sample has broad hump around 20 degrees. What do you think about that? Is dried plants shows this kind of pattern? Because after the drying, sample looks like including plenty of dried little particles of plant maybe is that a reason of that pattern?
Please, are you sure you avoited contamination ??
I suggest To restart the XRD.
Doriana Vinci
is right; it is organic matter;
e.g. wood and cellulose show broad humps in the 20° regime.
You may gently blow away the plant particles....
You may have a look at Fig. 8 (red patter) of the following link (quite amorphous celluose):
https://www.semanticscholar.org/paper/Facile-Cellulose-Dissolution-and-Characterization-Zhang-Xu/93487572a949e0b05f999b6136d02cd9334dc043
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