Analysis of a spring water

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Determination of NO3- ions with a selective electrode (potentiometry)

How it works

The operating principle is similar to that of the calcium ion selective electrode.

The membrane of the electrode contains a reagent that complexes NO3- ions (ionophore) almost selectively. This is often hexadecyl-tridodecyl ammonium nitrate.

When the membrane comes into contact with an aqueous solution containing NO3- ions, this results in a potential difference at the membrane-solution interface.

Diagram of the solution-membrane interface. The pvc membrane exchanges NO3- with the solution to be analyzed.
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