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I am experimenting on AAS and we were using an ion suppressor which is potassium. I...

I am experimenting on AAS and we were using an ion suppressor which is potassium. I don't exactly understand why do we have to use an ion suppressor. Can anybody is able to explain to me why?

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Answer #1

An ion suppressor is a salt of an alkali metal like potassium added to suppress ionization of an analyte.

The alkali metal like potassium is easily ionized resulting in a flux of electrons which shift the ionization equilibrium of analyte towards formation of atom. Here absorption radiation and signal response is independent of temperature. Thus, it's important to use ion suppressor in AAS (Atomic Absorption Spectroscopy).

As Intensity of absorbed radiation which is the basis of AAS and is directly proportional to the number of atoms in ground state .

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