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Novel Liquid Membrane Electrode for Selective Determination of Monohydrogenphosphate
Author(s) -
Ganjali Mohammad Reza,
Mizani Farhang,
Emami Mehdi,
Niasari Masoud Salavati,
Shamsipur Mojtaba,
Yousefi Mohammad,
Javanbakht Mehran
Publication year - 2003
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.200390015
Subject(s) - potentiometric titration , electrode , chemistry , ion selective electrode , membrane , selectivity , inorganic chemistry , titration , barium , analytical chemistry (journal) , chloride , ion , chromatography , catalysis , biochemistry , organic chemistry
A highly selective and sensitive membrane electrode based on vanadyl salen complex (VS), which responds to monohydrogenphosphate (MHP) ions is described. The response of the sensor is Nernstian over the wide concentration range (1.0×10 −1 − 5.0×10 −6 M) of MHP. The sensitivity of the electrode is high enough to permit the detection of as little as 0.6 μg/mL of MHP without any significant interference from high levels of other anions. The potentiometric selectivity coefficient data revealed negligible interference from 11 common anions. The electrode has a fast response time (<25 s), good slope stability at pH 8.2 for a period of at least eight weeks. It was successfully applied for the direct determination of monohydrogenphosphate in fertilizer and, as indicator electrode, in potentiometric titration of HPO 4 2− ion with barium chloride.