CPC G01N 27/301 (2013.01) [G01N 27/302 (2013.01); G01N 27/308 (2013.01); G01N 27/333 (2013.01); G01N 27/36 (2013.01); G01N 27/4035 (2013.01); G01N 27/4163 (2013.01); G01N 27/4165 (2013.01); G01N 27/4167 (2013.01); G01N 27/48 (2013.01); G01N 33/18 (2013.01)] | 43 Claims |
1. An online calibration system for an electrochemical sensor, comprising:
a calibration electrode in a reference solution, the calibration electrode comprising:
a redox species, wherein:
the redox species is configured to set a pH of the reference solution in a local environment proximal to the calibration electrode;
the redox species is configured to undergo oxidation and/or reduction when an electrochemical signal is applied to the calibration electrode; and
the redox species is sensitive to pH and generates a response to the applied electrochemical signal that is dependent on the pH of the local environment proximal to the calibration electrode, and
a polymeric layer positioned between the redox species and the reference solution.
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