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Chemically Modified Carbon Paste Electrode for Determination of Sulfate Ion by Potentiometric Method
Author(s) -
Soleymanpour Ahmad,
Asl Ezzat Hamidi,
Nasseri Mohmmad Ali
Publication year - 2006
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.200503562
Subject(s) - potentiometric titration , inorganic chemistry , chemistry , electrode , sulfate , carbon paste electrode , detection limit , quinhydrone electrode , zinc , ion selective electrode , reference electrode , electrode potential , metal ions in aqueous solution , glass electrode , chloride , chromium , ion , selectivity , electrochemistry , cyclic voltammetry , chromatography , catalysis , biochemistry , organic chemistry
Four Schiff base complexes of different metal ions, M=Cr(III), Mn(III), Fe(III), and Co(III), were studied to characterize their ability as sulfate ion carriers in carbon paste electrode (CPE). The modified CPE electrode with Schiff base complex of Cr(III), N , N ′‐ethylenebis(5‐hydroxysalicylideneiminato) chromium(III) Chloride, showed good response characteristics to SO 4 2− ion. The proposed electrode exhibits a Nernstian slope of 28.9±0.4 mV per decade for SO 4 2− ion over a wide concentration range from 1.5×10 −6 −4.8×10 −2 M, with a detection limit of 9.0×10 −7 M. The CPE electrode manifested advantages of relatively fast response time, suitable reproducibility and life time and, most important, good potentiometric selectivity relative to a wide variety of other common inorganic anions. The potentiometric response of the electrode is independent of the pH of the test solution in the pH range 4.0–9.0. The proposed electrode was used as an indicator electrode in potentiometric titration of sulfate with Ba 2+ ion, the determination of zinc in zinc sulfate tablet and also determination of sulfate content of a mineral water sample.