Electrochemical cell having a polarographic device with ion selective electrode as working electrode and method of use
AssigneeBayer Aktiengesellschaft
InventorsOtto Petersen, Hans-Dieter Schmidt
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Abstract
The sensitivity and, especially, the selectivity of a polarographic device can be increased by using an ion selective electrode as the working electrode in the electrochemical cell. The cell is a high sensitivity gas detector which is reliable in operation and which is particularly suitable for use in the field of environmental protection. Especially silver/silver iodide electrodes used in various electrolytes are particularly suitable for detecting hydrocyanic acid, phosgene and hydrogen sulphide.
Claims10
An electrochemical cell for the detection of a gas in a gas mixture, comprising a working electrode consisting of an ion-selective electrode, a reference electrode, an auxiliary electrode, an electrolyte, a potentiostat which is adjustable to the characteristic voltage for the component to be measured for monitoring the potential at zero current of the working electrode with respect to the reference electrode and for effecting a current flow between the auxiliary and working electrodes for polarizing the working electrode anodically or cathodically, a current measuring instrument for measuring the current between the working and auxiliary electrodes which is proportional to the concentration of the component and means for conducting the gas to the boundary between the working electrode and the electrolyte.
A method for the detection of a gas in a gas mixture which comprises providing an ion-selective electrode, an auxiliary electrode, a reference electrode and an electrolyte between the electrodes;
- adjusting a potentiostat to the characteristic voltage for the component to be measured and connecting same to the electrodes for monitoring the potential at zero current of the working electrode with respect to the reference electrode and for effecting a current flow between the auxiliary and working electrodes to polarize the working electrode anodically or cathodically;
- conducting the gas to the boundary between the working electrode and the electrolyte;
- and measuring the current between the working and auxiliary electrodes which is proportional to the concentration of the component.
Dependencies are inferred from the claim text.