| 摘要 |
<p>A method for the electrochemical determination of the oxygen concentration with an oxygen sensor that comprises a working electrode is characterized by the following steps: the working electrode has a potential profile having a plurality of potential steps impressed on it, whereby the first potential step lies in the range between -700 and -1000 mV (first measuring potential), the second potential step lies in the range between -750 and -1100 mV (second measuring potential), and the third potential step lies in the range between + 150 and - 300 mV, respectively referred to an Ag/AgCl reference electrode; the dwell time at the two measuring potentials respectively amounts to between 10 and 100 ms (measuring period); the current flowing at the two measuring potentials is calculated and is respectively integrated over the time, whereby the integration begins respectively 5 through 35 ms after the beginning of the measuring period and lasts between 5 and 35 ms; one of the two measuring potentials is varied dependent on the difference between the two integrals ( DELTA Q) until DELTA Q = 0 applies; and in that the oxygen concentration is determined from the value of the potential which thereby results.</p> |
