Importance

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Abstract

A differential pH probe design uses a container having an outer surface and an inner volume, where the inner volume is divided into a first, a second, and a third chamber. A first pH-sensitive area is located on the outer surface of the first chamber where the first pH-sensitive area is configured to be exposed to a sample. A second pH-sensitive area is located on the outer surface of the second chamber where the second pH-sensitive area is shielded from the sample and is exposed to a first buffer solution. A third pH-sensitive area is located on the outer surface of the third chamber where the third pH-sensitive area is shielded from the sample and is exposed to a second buffer. A first electrode is configured to detect a first voltage across the first pH-sensitive area, a second electrode is configured to detect a second voltage across the second pH-sensitive area and a third electrode is configured to detect a third voltage across the third pH-sensitive area. Circuitry is configured to process the first voltage, the second voltage, and the third voltage to determine a pH of the sample.

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First Claim