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

Constitution of the electrode

As with the calcium ion selective electrode, this electrode consists of:

  • an Ag/AgCl reference electrode (chloride silver wire) connected via a connecting head (part A) to a conducting wire;
  • A plastic body containing at its end a PVC (polyvinyl chloride) membrane containing an ionophore capable of almost selectively complexing the nitrate ions NO3- (active part of the electrode);
  • An internal KNO3 filling solution supplied by the manufacturer.
Diagram of the electrode construction. The connecting head (part A) at the top is extended by the electrode body (part B). The Ag / AgCl reference electrode is soaked in a filling solution. At the base is a PVC membrane containing an ionophore.
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