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Cobalt(II)‐Selective Coated Graphite PVC‐Membrane Electrode Based on a Recently Synthesized Dibenzopyridino‐Substituted Macrocyclic Diamide
Author(s) -
Shamsipur Mojtaba,
Rouhani Shohre,
Poursaberi Tahereh,
Ganjali Mohammad Reza,
Sharghi Hashem,
Niknam Khodabakhsh
Publication year - 2002
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200206)14:11<729::aid-elan729>3.0.co;2-6
Subject(s) - potentiometric titration , cobalt , electrode , inorganic chemistry , alkali metal , titration , graphite , membrane , detection limit , metal ions in aqueous solution , chemistry , ion selective electrode , polyvinyl chloride , ion , selectivity , chromatography , organic chemistry , catalysis , biochemistry
A cobalt(II)‐selective graphite coated PVC‐membrane electrode has been developed by using a new dibenzopyridino‐substituted macrocyclic diamide as a neutral carrier. The electrode exhibits a Nernstian response for Co 2+ ions over a very wide concentration range (7.0×10 −7 −1.0×10 −2 M). The limit of detection was 2.0×10 −7 M (ca. 12 ppb). It has a fast response time of about 10 s and can be used for at least 3 months without observing any deviation. The proposed electrode revealed good selectivities for Co 2+ over a wide variety of alkali, alkaline earth, transition and heavy metal ions, and could be used in a pH range of 3.0–8.5. It has been used as an indicator electrode in the potentiometric titration of Co 2+ ions and in direct determination of cobalt ion in waste water samples.