You can find these frequencies with Larmor's frequency calculator for elements. These varies according the magnetic field applied in any substance or element. OK.
With PPM, both of these are only accomplished when the water is INSIDE the coil. The same is true with hospital MRI machines... the patient is slid INSIDE a humongous coil.
Yes, but you forgett the possibility of irradiated a kind of laser-infrared beam (modulated) and collect the information regarding each substance.
I think seriously in other kind of frequency, the based on vibration of the molecules of each element, very precisse for each.
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