Can anybody explain how to distinguish ammonia and ammonium ion forms in solid substrate?

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Danilo Zangani

I guess it is all matter of pH, if the solid substrate is not completely anhydrous.

Yehya Muneeb Ahmed

my dear Ms. Durga..u can recognize Ammonia as it is a gas and simply u can verify by the litmus paper (red turns blue)

Wayne F Beyer

Have you tried NIR/Resonance Raman spectroscopy?

Seems like the stretching /polarization characteristics for NH3 would be different that NH4+

Durga Parajuli

@Wayne F Beyer: Thank you very much. Yes, it worked well.