ELECTROCHEMICAL SENSOR FOR DISINFECTANTS
First Claim
1. A system for monitoring concentration of disinfectants, the system comprising:
- an electrochemical sensor for measuring disinfectants, the sensor comprising;
a sensor body;
an electrolyte disposed within the sensor body;
a membrane coupled to the sensor body and adapted to pass disinfectants into the sensor body;
a working electrode disposed proximate the membrane, the working electrode being made of silver;
a reference electrode disposed in the electrolyte, the reference electrode being silver in equilibrium with the electrolyte; and
an electronic device coupled to the sensor, the electronic device adapted to maintain a potential difference between the working electrode and the reference electrode and to measure the current flowing through the working electrode.
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Abstract
An electrochemical sensor to measure disinfectants is provided. In accordance with one aspect of the invention, the sensor has a silver working electrode disposed in an electrolyte proximate a porous membrane. There is a reference electrode made of silver in contact with the electrolyte. The chemical composition of electrolyte contains one or more anions that make the potential at the reference electrode higher than 0.35 V versus standard hydrogen electrode. The anions form silver salt with solubility higher than the solubility of silver chloride. The voltage at the working electrode versus the reference electrode is maintained negative to keep the background current small enough while maintains the feasibility to reduce disinfectants. Solid phase silver salt of the anions is added within the sensor body, which will prevent poisoning the reference electrode by halide anions diffused into the electrolyte.
5 Citations
13 Claims
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1. A system for monitoring concentration of disinfectants, the system comprising:
- an electrochemical sensor for measuring disinfectants, the sensor comprising;
a sensor body;
an electrolyte disposed within the sensor body;
a membrane coupled to the sensor body and adapted to pass disinfectants into the sensor body;
a working electrode disposed proximate the membrane, the working electrode being made of silver;
a reference electrode disposed in the electrolyte, the reference electrode being silver in equilibrium with the electrolyte; and
an electronic device coupled to the sensor, the electronic device adapted to maintain a potential difference between the working electrode and the reference electrode and to measure the current flowing through the working electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- an electrochemical sensor for measuring disinfectants, the sensor comprising;
Specification