Monitoring of electrochemically inactive compounds by amperometric toxic gas sensors
A sample of 200 ppM benzene in air was circulated at rate of 10 mL/min past a heated 0.01-cm diameter platinum filament and then past a platinum-black sensing electrode potentiostated at 1.2 V versus RHE (reversible hydrogen electrode) in a 30 weight-% sulfuric acid electrolyte. The current through the electrode increased as the filament temperature was increased to about 600/sup 0/C. Sensing electrodes made of vapor-deposited platinum or platinum-gold alloy on porous polytetrafluorethylene yielded proportionately similar responses, whereas no significant response was obtained under the same conditions with a powdered gold sensing electrode. The room-temperature responses to various test compounds of the four sensing electrodes were measured at electrode potentials ranging from 0.9 V to 1.4 V versus RHE, with and without the heated platinum filament. The following ten compounds were tested: cyclohexane, chloroform, tetrachloroethylene, acetic acid, benzene, nitrobenzene, pyridine, benzyl chloride, ethyl acrylate, and tetrahydrofuran. Only the last two compounds elicited significant responses without the filament. However, with the filament heated to about 600/sup 0/C, each of the tested compounds elicited significant responses under different conditions.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 5130384
- Report Number(s):
- CONF-840304-2; ON: DE84009211
- Resource Relation:
- Conference: 35. Pittsburgh conference and exposition on analytical chemistry and applied spectroscopy, Atlantic City, NJ, USA, 5 Mar 1984
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ACETIC ACID
DETECTION
ACRYLATES
AIR POLLUTION MONITORS
PERFORMANCE TESTING
BENZENE
CHLOROFORM
CYCLOHEXANE
NITROBENZENE
ORGANIC CHLORINE COMPOUNDS
PYRIDINES
TETRAHYDROFURAN
ELECTRIC CURRENTS
ELECTRODES
FILAMENTS
PLATINUM
ALKANES
AROMATICS
AZINES
CARBOXYLIC ACID SALTS
CARBOXYLIC ACIDS
CHLORINATED ALIPHATIC HYDROCARBONS
CURRENTS
CYCLOALKANES
ELEMENTS
FURANS
HALOGENATED ALIPHATIC HYDROCARBONS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
MEASURING INSTRUMENTS
METALS
MONITORS
MONOCARBOXYLIC ACIDS
NITRO COMPOUNDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PLATINUM METALS
TESTING
TRANSITION ELEMENTS
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)
400102 - Chemical & Spectral Procedures