Response mechanism of platinum electrode to uncoupled ions(I)
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The transient response mechanism of the platinum electrode to the uncoupled ions may be interpreted with the mixed phase formation (MPF) model of the transient response of precipitate-based ion-selective electrodes to interfering ions for Kxy ≪ 1. It is discovered that the peak height of the transient signal is related to the solubility of M(OH)2 and hydration heat of M2+. The relation between the positive peak height of transient signal of pb2+ or cd2+ and lgam obey the Nernst equation, while that of Ca2+ or Mg2+ does not. The equilibrium potential is not of Nernst response for all ions.
Keywordsplatinum electrode uncoupled ion transient potential response signal mixed phase formation model
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