Voltammetric detector for flow analysis
First Claim
1. A wall-jet detector for detecting electrochemical species in continuous-flow monitoring, comprising:
- a detector cell having an internal chamber of large solution volume where the chamber is open at one end;
a liquid jet producing means coupled tothe cell housing for providing a liquid jet having a jet direction into said chamber and said liquid jet producing means defining a liquid jet inlet to said chamber;
a working electrode fabricated on a flat, rectangular slide that is slidably positioned in said cell chamber opposite to said liquid jet inlet at a predetermined distance therefrom, and said working electrode lying in a plane substantially perpendicular to the direction of said liquid jet inlet;
a reference electrode coupled to the cell and extending into said chamber and positioned outside the boundary layer of said liquid jet;
a counter electrode coupled tothe cell; and
a liquid outlet means for permitting the outflow of solution from said chamber where the outlet controls the solution level in the cell chamber so that the level is above the working
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Abstract
One of the fundamental limitations of voltammetric detectors in flow analysis is the problem of passivation or contamination of the working electrode. The present invention proposes a voltammetric detector based on the wall-jet principle which incorporates the concept of a replaceable working electrode. The voltammetric detector represents a significant improvement over existing detectors which are fully enclosed or sealed devices precluding easy replacement of the working electrode.
The design of the present invention provides a detector where the top is fully open and where the solution volume is maintained by the outlet positioning. The other feature of the proposed detector is an optimised geometry that provides well defined wall-jet flow characteristics which is not provided in existing detectors.
47 Citations
20 Claims
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1. A wall-jet detector for detecting electrochemical species in continuous-flow monitoring, comprising:
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a detector cell having an internal chamber of large solution volume where the chamber is open at one end; a liquid jet producing means coupled tothe cell housing for providing a liquid jet having a jet direction into said chamber and said liquid jet producing means defining a liquid jet inlet to said chamber; a working electrode fabricated on a flat, rectangular slide that is slidably positioned in said cell chamber opposite to said liquid jet inlet at a predetermined distance therefrom, and said working electrode lying in a plane substantially perpendicular to the direction of said liquid jet inlet; a reference electrode coupled to the cell and extending into said chamber and positioned outside the boundary layer of said liquid jet; a counter electrode coupled tothe cell; and a liquid outlet means for permitting the outflow of solution from said chamber where the outlet controls the solution level in the cell chamber so that the level is above the working - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification