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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 26, Number 1
BKCSDE 26(1)
January 20, 2005 

 
Title
La(III) Selective Membrane Sensor Based on a New N-N Schiff's Base
Author
Mohammad Reza Ganjali*, Parisa Matloobi, Maryam Ghorbani, Parviz Norouzi, Masoud Salavati-Niasari
Keywords
La(III) sensor, Potentiometry, PVC, N-N Schiff's base
Abstract
Bis(2-methylbenzaldehyde)butane-2,3-dihydrazone(TDSB) was used as new N-N Schiff's base which plays the role of an excellent ion carrier in the construction of a La(III) membrane sensor. The best performance was obtained with a membrane containing, 30% poly(vinyl chloride), 60% benzyl acetate, 6% TDSB and 4% sodium tetraphenyl borate. This sensor reveals a very good selectivity towards La(III) ions over a wide variety of cations, including alkali, alkaline earth, transition and heavy metal ions. The proposed electrode exhibits a Nernstian behavior (with slope of 19.8 mV per decade) over a wide concentration range (1.0 × 10.5-1.0 × 10.1M). The detection limit of the sensor is 7.0 × 10.6 M. It has a very short response time, in the whole concentration range (~5 s), and can be used for at least twelve weeks in the pH range of 3.0-9.4. The proposed sensor was successfully applied as an indicator electrode for the potentiometric titration of a La(III) solution, with EDTA. It was also successfully applied in the determination of fluoride ions in three mouth wash preparations.
Page
38 - 42
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