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.
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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 lgCCeCl-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[Ci+B2(Ci+Cj)B3]
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