Chemistry: electrical and wave energy – Processes and products
Patent
1987-07-22
1989-02-14
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
204406, 204409, 204411, 204412, 204413, G01N 2742
Patent
active
048044431
ABSTRACT:
A method and apparatus for determining electrochemically active components in a process stream. The method comprises the steps of providing a sample in which the components are contained, and depositing the components onto a working electrode, altering the environment of the working electrode so that it is immersed in a supporting electrolyte by effecting a matrix exchange and stripping the deposited electrochemically active components from the working electrode into the supporting electrolyte. The method and apparatus utilize a measurement cell which comprises a vessel (10) for containing the supporting electrolyte and a mercury drop electrode (150). A flow injector (16) is used to inject a flow of a sample electrolyte which contains the electrochemically active component; and into the vessel so that the sample electrolyte surrounds the mercury drop electrode and then sinks away from the mercury drop electrode (150) to the bottom of the vessel where it is removed via an outlet (20) to thereby leave the mercury electrode (150) immersed in the supporting electrolyte. The deposited impurities are stripped from the working electrode using variable time domain transient electrochemical stripping voltammetry. The sequence of steps including the deposition of the impurities from an injected flow of electrolyte sample are repeated under microprocessor control (50).
REFERENCES:
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A. M. Bond et al., "High Flow-Rate Cells for Continuous Monitoring of Low Concentrations of Electroactive Species", etc., Analytica Chimica Acta, 127, pp. 121-133 (1981).
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A. M. Bond, "Modern Polarographic Methods in Analytical Chemistry", Chap. 9, Stripping Voltammetry, pp. 435-472.
Bond Alan M.
Knight Robert W.
Newman Oliver M. G.
Electrolytic Zinc Company of Australia Limited
Kaplan G. L.
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