Amperometric monitoring of ozone in gaseous media by gold electrodes supported on ion exchange membranes (solid polymer electrolytes)

An in situ amperometric sensor suitable for monitoring ozone in gaseous media is described. It consists of a porous gold working electrode (contacting the gaseous sample) supported on one surface of an ion exchange membrane (Nafion 417) which serves as a solid polymer electrolyte. The other side of...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 1990-02, Vol.62 (3), p.293-298
Main Authors: Schiavon, Gilberto, Zotti, Gianni, Bontempelli, Gino, Farnia, Giuseppe, Sandona, Giancarlo
Format: Article
Language:English
Subjects:
400200 > Inorganic, Organic, & Physical Chemistry
AMPEROMETRY
Chemistry
DATA
DATA ANALYSIS
Electrochemistry
ELECTRODES
ELEMENTS
ENVIRONMENTAL SCIENCES
Exact sciences and technology
EXPERIMENTAL DATA
FLUID FLOW
GAS FLOW
General and physical chemistry
GOLD
INFORMATION
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
ION EXCHANGE MATERIALS
MATERIALS
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
MONITORING
NUMERICAL DATA
OZONE
Properties of electrolytes: conductivity
TITRATION
TRANSITION ELEMENTS 540120 > Environment, Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
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Description
Summary:An in situ amperometric sensor suitable for monitoring ozone in gaseous media is described. It consists of a porous gold working electrode (contacting the gaseous sample) supported on one surface of an ion exchange membrane (Nafion 417) which serves as a solid polymer electrolyte. The other side of this membrane faces an internal electrolyte solution (1 M aqueous perchloric acid) containing the counter and reference electrodes. Amperometric measurements are performed at an applied potential of 0.5 V vs SCE, by inserting the sensor in a cell in which ozone-oxygen streams are fed with different controlled rates. A current sensitivity of 38 A M{sup {minus}1} cm{sup {minus}2} and a response time of 0.5 s are observed. The dynamic range turns out to extend up to 2 {times} 10{sup {minus}3} M (4.48 {times} 10{sup {minus}2} atm) with good linearity and a detection limit of 10{sup {minus}8} M (2.24 {times} 10{sup {minus}7} atm) is predicted for S/N = 3. These performances are compared with those provided by the corresponding gas-permeation membrane electrodes and by spectrophotometric methods employing suitable reagents. The effect of the flow rate on current responses is also discussed.
ISSN:0003-2700
1520-6882
DOI:10.1021/ac00202a013