Title: Electrochemical analysis apparatus employing single ion measuring sensor

Abstract: Apparatus for measuring CO.sub.2 in serum with a single pH sensor of the electrolyte flow-through type, the sensor including a gas-permeable membrane selectively passing CO.sub.2 into an electrolyte filled space adjacent a pH sensing electrode for reacting with the electrolyte to produce a pH change therein. The electrolyte space is connected by a conduit to an electrolyte reservoir for flowing fresh electrolyte to and through the electrolyte space prior to a sample measurement. A stainless steel metal electrode directly contacts the electrolyte of constant composition in the conduit upstream of the pH sensor to derive a reference potential thereat. The potential across the pH sensor and the stainless steel electrode is monitored, differentiated, and the maximum value of the differentiated signal measured to determine the CO.sub.2 concentration.

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Inventors: Buzza, Edmund E. (Fullerton, CA, US)
Lillig, John E. (Diamond Bar, CA, US)

Application Number: 922459
Filing Date: 1978-07-06
Publication_date: 1979-04-17
Assignee: Beckman Instruments, Inc. (Fullerton, CA)
Primary Class(es): 204/406 204/415, 204/420
Other Classes:
US Patent Ref:

3857771	Dec, 1974	Sternberg	204/195.
3869354	Mar, 1975	Montalvo	204/195.

Other Refs:
Primary Examiner: Williams, Howard S.
Assistant Examiner:
Attorney: Steinmeyer; R. J., Meads; Robert R., Shewmaker; John R.