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Citation: Li Han, Cheng Yudu, Wu Jinlan. ON THE CHARACTER OF RARE EARTH ION-SELECTIVE ELCTRODE IN THE NON-LINEAR RESPONSE REGION[J]. Chinese Journal of Applied Chemistry, ;1987, 4(3): 73-75. shu

ON THE CHARACTER OF RARE EARTH ION-SELECTIVE ELCTRODE IN THE NON-LINEAR RESPONSE REGION

1.
Changchun Institute of Applied Chemistry, Academia Sinica

Corresponding author: Li Han,
Received Date: 16 August 1985
Available Online: 16 July 1986

The character of cerium oxide membrane ion-selective electrode (ISE) for individual and mixed rare earth system in the non-linear response region has been investigated. The potential of the linear response region of ISE for HCl-CeCl₃ system at pH=4.9-6.0 and rare earth conceniration (C)=10^-2-10^-5M can be described as:E=-30 lgC_CeCl-47.1 The relations of △E-C and △E-pH for HCl-PrCl₃ system show that when pH<2 the interference is higher and the electrode can't be used for the measurement. The relations of △E-C for two rare earths mixed (Pr-Nd)Cl₃ C=0.25-0.7M, four rare earths (La-Ce-Pr-Nd) Cl₃ C=0.14-0.7M and fifteen rare earths (La-Lu) and Y C=0.2-1.0M systems in the presence of NH₄Cl show that when pH ≥ 2 the responses similar to those what in the individual rare earth, while pH<2 the interference of the acidity is evident. A general, more accurate model for various systems is proposed through mathmatical simulation:E=B₁ lg[C_i+B₂(C_i+C_j)^B₃]
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