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Amperometric determination of ozone in water at disposable graphite reinforcement carbon electrodes
Author(s) -
Aoki Koichi,
Kobayashi Atsushi,
Kato Nakahide
Publication year - 1990
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.1140020107
Subject(s) - saturated calomel electrode , ozone , electrode , glassy carbon , analytical chemistry (journal) , chemistry , detection limit , standard hydrogen electrode , inorganic chemistry , platinum , carbon fibers , reference electrode , calibration curve , chlorine , materials science , electrochemistry , chromatography , cyclic voltammetry , composite material , organic chemistry , catalysis , composite number
The voltammetric reduction behavior of ozone in an acidic solution was examined at gold, platinum, glassy carbon, and graphite reinforcement carbon (GRC) electrodes. The GRC electrode, the lead of a mechanical pencil, exhibited a well‐defined ozone reduction wave at 0.8–0.9 V versus a saturated calomel electrode (SCE) on a flat base current, whereas gold and glassy carbon electrodes were insensitive or nonselective to ozone. The platinum electrode showed no base current and, hence, made background correction difficult. The response was not degraded by long exposures of the GRC electrode to the ozonized solution. The reduction of ozone at the GRC electrode was controlled by a sluggish charge‐transfer step and diffusion. Differential pulse voltammetric peak current showed a linear variation with ozone concentration up to the detection limit of 6 × 10 −7 mol/dm 3 ozone in acidic solutions. Residual ozone in tap water disinfected by chlorine was determined by the present method; a linear calibration curve was also obtained.