Self cleaning electrochemical detector and cell for flowing stre

Details Self cleaning electrochemical detector and cell for flowing stre Self cleaning electrochemical detector and cell for flowing stre

1983-10-19

1985-01-29

Kaplan, G. L.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

73 611C, 204406, 204409, 204411, 422 70, 436161, G01N 3108

Patent

active

044964544

ABSTRACT:
An improved electrochemical cell and detector which is especially suited for analysis of rapidly changing flowing streams such as found in high performance liquid chromatography is disclosed. A uniquely designed jet made of microbore drawn capillary tubing permits the construction of a cell for very low flow rates that still retains true wall-jet hydrodynamics. The invention prevents changes in cell response in time by periodically cleaning a working electrode in a novel way. Cleaning and detection are both accomplished on a time scale much shorter than the fastest liquid chromatograph peaks by means of a unique three electrode cell design utilizing a small diameter, low capacitance, metal working electrode situated close to a reference electrode. Cleaning is accomplished by means of a non-square wave periodic waveform which is effective in cleaning a wide variety of contaminants through the oxidation and reduction of the working electrode and/or solvent prior to application of one or more working potentials while providing a stable, reproducible detector. The detector thus provides improvements in both sensitivity and bandwidth over the prior art.

REFERENCES:
patent: 3676321 (1972-07-01), Cummings et al.
patent: 4057478 (1977-11-01), Bruckenstein et al.
patent: 4059406 (1977-11-01), Fleet
Joseph Yamada and Hiroaki Matsuda, "Wall Jet Electrodes", Electroanalytical Chemistry and Interfacial Electrochemistry, 44, p. 189, (1973).

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