Abstract
A new Eu3+PVC membrane electrode based on 1,2-diaminopropane-N, N,N',N'-tetraacetic acid (DAPTA) as a suitable ionophore has been prepared and studied. The electrode shows a good selectivity for Eu(III) ion with respect to most common cations including alkali, alkaline earth, transition and heavy metal ions. This electrode has a wide linear dynamic range from 1.0×10-6to 1.0×10-2M with a Nernstian slope of 19.7±0.5 mV per decade and a low detection limit of 7.2×10-7M in the pH range of 2.5–9.1, while the response time was rapid (<10 s). The practical utility of the electrodes has been demonstratedby their use as indicator electrodes in the potentiometric titration of Eu3+ions with EDTA and for the determination of Eu3+in some water sample solutions.
Highlights
Nowadays, applications of rare earth elements in agricultural, metallurgical, optical and glass industries, ceramics, and biological areas have increased
In order to check the suitability of DAPTA as an ion carrier for different metal ions, the DAPTA was employed as a potentially suitable neutral carrier in the construction of a number PVC membrane ion-selective electrodes under identical conditions for a large number of metal ions, including alkali, alkaline earth, transition and heavy metal ions
The results revealed that except Eu3+ ion with the most sensitive response, in all other cases the slopes of the corresponding emf versus pMn+ are much lower than the expected slopes
Summary
Applications of rare earth elements in agricultural, metallurgical, optical and glass industries, ceramics, and biological areas have increased. Potentiometric ion selective electrode is one of the selective methods for the determination of rare earth elements. PVC-membrane ion-selective electrodes for alkaline earth and transition metal ions[4,5,6,7,8,9,10,11,12,13,14,15,16].
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