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Response mechanism of platinum electrode to uncoupled ions(I)

—Response of platinum electrode to pb2+, cd2+, ca2+ and Mg2+

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Abstract

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.

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Authors and Affiliations

  1. Institute of Electroanalytical Chemistry, Northwest University, 710069, Xi’an, China

    Shenghua Shi, Shuping Yu & Peng Liu

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  1. Shenghua Shi
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  2. Shuping Yu
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  3. Peng Liu
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Project supported by the National Natural Science Foundation of China.

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Shi, S., Yu, S. & Liu, P. Response mechanism of platinum electrode to uncoupled ions(I). Sc. China Ser. B-Chem. 40, 37–44 (1997). https://doi.org/10.1007/BF02882186

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  • DOI: https://doi.org/10.1007/BF02882186

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