Abstract
A polyvinyl chloride membrane sensor for praseodymium(III) ions was prepared based on N′1,N′2-bis(2-oxo-1,2-diphenylethylidene)ethanedihydrazide (BEH) as a membrane carrier. This electrode has a wide linear dynamic range from 1.0 × 10−6 to 1.0 × 10−2 M with a Nernstian slope of 19.6 ± 0.4 mV per decade and a low detection limit of 4.3 × 10−7 M between the pH values of 2.8 and 8.7; additionally, the response time was about 10 s and usage was 2 months without any potential divergence. Moreover, the recommended selective sensor revealed a comparatively satisfactory selectivity regarding most of the alkali and alkaline earths and some transition- and heavy-metal ions. It was employed as an indicator electrode in the potentiometric titration of Pr(III) ions with EDTA. The membrane sensor was also applied to the Pr3+ recovery from different water samples and the determination of fluoride ions in mouthwash samples.
Acknowledgments
The authors acknowledge the kind financial support provided by the Research Council of Quchan University for the preparation of this study.
Notes
Note. NM: not mentioned.
a Results are based on three measurements.
a Proposed Pr3+ sensor.
b Results are based on three measurements.