Discussion
Why is excessive grinding sometimes harmful?
Answer: B
Mechanical energy can convert a metastable polymorph into a different one, whose infrared spectrum differs, so the analysis reports a form that was created rather than found. Heating, moisture and contamination are lesser risks that also exist. That a preparation step can change the very property being measured is a hazard worth knowing in any solid-state technique, and it is one reason attenuated total reflectance, which needs no grinding, is preferred.
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