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Triiodide PVC Membrane Electrode Based on a Charge‐Transfer Complex of Iodine with Ditertbutyl‐Dicyclohexyl‐18‐Crown‐6
Author(s) -
Khayatian Golamreza,
Karoonian Fatemeh Salehi
Publication year - 2008
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200800152
Subject(s) - chemistry , triiodide , electrode , quinhydrone electrode , detection limit , inorganic chemistry , ascorbic acid , iodine , membrane , analytical chemistry (journal) , reference electrode , electrolyte , chromatography , organic chemistry , dye sensitized solar cell , biochemistry , food science
Abstract A new triiodide ion‐selective electrode based on a charge‐transfer complex of iodine with ditertbutyl‐dicyclohexyl‐18‐crown‐6 (t‐Bu) 2 DC18C6 as membrane carrier was prepared. The electrode has a linear dynamic range from 6.3 × 10 −3 ‐5 × 10 −6 with a Nernstian response of 58.6 ± 1 mV decade −1 and a detection limit of 1.3 × 10 −6 M. The response time of the sensor was 25 s. The membrane could be used for two months without any divergence in potentials. The electrode exhibits an anti‐Hofmeistetr selectivity sequence with a preference for triiodide at pH 2.0‐10.0. The response mechanism of the electrode was investigated by Uv‐Vis spectroscopic technique. The electrode can be used for the determination of ascorbic acid in orange juice.