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Polymeric Membrane Lanthanum(III)‐Selective Electrode Based on N,N ′‐Adipylbis(5‐phenylazo salicylaldehyde hydrazone)
Author(s) -
Shamsipur Mojtaba,
Ershad Sohrab,
Samadi Naser,
Esmaeilbeig Ahmad Reza,
Kia Reza,
Abdolmaleki Amir
Publication year - 2005
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200503309
Subject(s) - potentiometric titration , salicylaldehyde , chemistry , hydrazone , electrode , lanthanum , detection limit , inorganic chemistry , membrane , selectivity , titration , glass electrode , metal ions in aqueous solution , ion selective electrode , alkali metal , schiff base , ion , working electrode , electrolyte , chromatography , polymer chemistry , organic chemistry , catalysis , biochemistry
A recently synthesized azao‐containing Schiff's base N , N ′‐adipylbis(5‐phenylazo salicylaldehyde hydrazone) was used as a suitable neutral ion carrier in construction of a highly selective La 3+ ‐PVC membrane electrode. The electrode exhibits a Nernstian response with a slope of 19.4 mV decade −1 over a wide concentration range (1.0×10 −6 –1.0×10 −2 M) and a limit of detection of 4.0×10 −7 M (0.05 ppm). The electrode possesses a fast response time of ca. 10 s and can be used for at least 3 months without observing any deviation. The proposed electrode revealed excellent selectivity for La 3+ over a wide variety of alkali, alkaline earth, transition and heavy metal ions and could be used in a pH range of 4.0–8.0. The practical utility of the electrode has been demonstrated by its use as an indicator electrode in the potentiometric titration of La 3+ ions with EDTA and in determination of F − ion in some pharmaceutical preparations.