Probe for measuring liquid buffering capacity
First Claim
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1. A method for measuring the buffering capacity of a liquid containing dissolved oxygen which comprises:
- (a) providing a liquid containing dissolved oxygen;
(b) providing a cathodically or anodically polarized, conductive surface immersed in said liquid;
(c) connecting electrical circuits to apply a constant cathodic potential between (1) a working electrode and a reference electrode and (2) to provide means for measuring the difference in potential between a pH microelectrode and a reference electrode;
(d) applying a known potential to said conductive surface;
(e) treating said liquid to create a constant bulk dissolved oxygen concentration;
(f) measuring the differences in pH at said conductive surface; and
(g) determining the buffering capacity of said liquid from said pH measurement and said known potential.
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Abstract
An apparatus and method for measuring the buffering capacity of a liquid which utilizes a pH electrode positioned at the surface of a working electrode. Measured changes in pH of the metal-water interface at known potentials which are applied to the working electrode are used to calculate the liquid buffering capacity.
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Citations
11 Claims
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1. A method for measuring the buffering capacity of a liquid containing dissolved oxygen which comprises:
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(a) providing a liquid containing dissolved oxygen; (b) providing a cathodically or anodically polarized, conductive surface immersed in said liquid; (c) connecting electrical circuits to apply a constant cathodic potential between (1) a working electrode and a reference electrode and (2) to provide means for measuring the difference in potential between a pH microelectrode and a reference electrode; (d) applying a known potential to said conductive surface; (e) treating said liquid to create a constant bulk dissolved oxygen concentration; (f) measuring the differences in pH at said conductive surface; and (g) determining the buffering capacity of said liquid from said pH measurement and said known potential. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for measuring the buffering capacity of a liquid comprising:
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(a) a working electrode with a pH electrode positioned at or adjacent to a surface of said working electrode; (b) at least a first and second electrical circuit, said first electrical circuit comprising means for applying a constant cathodic or anodic potential between said working electrode and a reference electrode, and said second electrical circuit comprising means for measuring the pH at or adjacent to a surface of said working electrode; (c) means to create and maintain a constant bulk dissolved oxygen concentration adjacent said working electrode; (d) micromanipulator for positioning said pH electrode at or adjacent to a surface of said working electrode; and (e) at least a counter electrode and a reference electrode. - View Dependent Claims (9, 10, 11)
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Specification