Electrochemical determination of oxygen concentration
First Claim
1. A process for electrochemically determining oxygen concentration in a fluid using an oxygen sensor having a sensor electrode, comprising the steps of:
- impressing a potential profile having a plurality of potential stages on the sensor electrode, a first potential stage being in a range between -0.5 and -1.2 V as a first measuring potential, a second potential stage being in a range between -0.5 and -1.3 V as a second measuring potential, and a third potential stage being about 0 V, referred in all cases to an Ag/AgCl reference electrode, and there being a potential difference between the first and second measuring potentials of ≧
50 mV and a length of stay at the first and second measuring potentials being in each case between 10 and 50 ms as a measurement period,determining a current flowing at the first and second measuring potentials and integrating the current with respect to time to obtain two integrals, the integration starting in each case about 5 to 30 ms after the start of the measurement period and having a duration in each case between 5 and 10 ms, anddetermining an oxygen concentration by taking the difference between the two integrals obtained from the step of integrating.
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Abstract
In a process for electrochemically determining the oxygen concentration, in particular in body fluids, by means of an oxygen sensor having a sensor electrode, an exact oxygen determination is possible if a potential profile having a plurality of potential stages is impressed on the sensor electrode, the first potential stage being in the range between -0.5 and -1.2 V (1st measuring potential), the second potential stage being in the range between -0.5 and -1.3 V 2nd measuring potential) and the third potential stage being about 0 V, referred in all cases to an Ag/AgCl reference electrode, and there being between the two measuring potentials a potential difference of ≧50 mV, the length of stay at the two measurement potentials is in each case between 10 and 50 ms (measurement period), the current flowing at the two measuring potentials is determined and is integrated with respect to time, the integration starting in each case about 5 to 30 ms after the start of the measurement period and lasting in each case between 5 and 10 ms, and the oxygen concentration is determined by taking the difference between the two integrals.
16 Citations
12 Claims
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1. A process for electrochemically determining oxygen concentration in a fluid using an oxygen sensor having a sensor electrode, comprising the steps of:
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impressing a potential profile having a plurality of potential stages on the sensor electrode, a first potential stage being in a range between -0.5 and -1.2 V as a first measuring potential, a second potential stage being in a range between -0.5 and -1.3 V as a second measuring potential, and a third potential stage being about 0 V, referred in all cases to an Ag/AgCl reference electrode, and there being a potential difference between the first and second measuring potentials of ≧
50 mV and a length of stay at the first and second measuring potentials being in each case between 10 and 50 ms as a measurement period,determining a current flowing at the first and second measuring potentials and integrating the current with respect to time to obtain two integrals, the integration starting in each case about 5 to 30 ms after the start of the measurement period and having a duration in each case between 5 and 10 ms, and determining an oxygen concentration by taking the difference between the two integrals obtained from the step of integrating. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification