Electrochemical detector system
AssigneeE D T Supplies Limited
InventorBernard Fleet
Life of this patent
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Abstract
An electrochemical detector has an electrochemical thin-layer flow cell whose operation is based on the so-called wall-jet principle, in combination with a controller unit. The controller unit can apply a periodically changing voltage having a square wave voltage formation to a sensor electrode of the electrochemical cell such that a first potential level of the square wave functions as a detecting potential and a second potential level of the square wave functions as a cleaning potential.
Claims18
A method for detecting an electroactive species in a flow stream comprising the steps of:
- i. forcing a solution containing the electroactive species through a fine nozzle to form a jet,
- ii. impringing the jet normally to a surface of a sensor electrode so that the solution spreads radially over the surface in a thin film,
- iii. applying a periodically changing voltage to the sensor electrode, so that one part of each cycle of the applied voltage functions as a detecting potential and another part of each cycle functions as a cleaning potential, and
- iv. measuring a current at the sensor electrode during that part of each cycle of the applied voltage functioning as a detecting potential.
In an electrochemical detector having an electrochemical thin-layer flow cell adapted to operate on the wall-jet principle comprising a solution inlet line terminating in a fine nozzle, a sensor electrode, at least one solution exit line, and at least one other electrode, the improvement comprising means for applying a periodically changing voltage to the sensor electrode so that a first part of each cycle of the applied voltage functions as a detecting potential and a second part of each cycle of the applied voltage functions as a cleaning potential.
An electrochemical detector having an electrochemical thin-layer flow cell adapted to operate on the wall-jet principle comprising a sensor electrode, a solution inlet line terminating in a fine nozzle, the said nozzle being located normally to but displaced from a surface of the sensor electrode, at least one solution exit line, at least one other electrode and means comprising a controller unit for applying a periodically changing voltage to the sensor electrode so that one part of each cycle of the applied voltage functions as a detecting potential and another part of each cycle of the applied voltage functions as a cleaning potential.
Dependencies are inferred from the claim text.