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Determination of Ca2+ ions with a selective electrode (potentiometry)

How it works

The membrane of the electrode contains a reagent that almost selectively complexes calcium ions (ionophore). This is often referred to as BBTP.

When the membrane comes into contact with an aqueous solution containing Ca2+ ions, a potential difference arises at the solution-membrane interface.

Illustration of the solution - membrane interface. The Ca2+ ions pass from the solution to be analyzed to the PVC + complexing member and vice versa.
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