Ph compound electrode, monitoring and detection system and method for eliminating the influence of potential drift
A composite electrode and response electrode technology, which is used in measurement devices, material electrochemical variables, material analysis by electromagnetic means, etc., can solve problems such as long-term drift, inability to obtain pH monitoring results, and inability to obtain accurate pH values, etc. Achieve the effect of broadening the scope of application and reducing the need for offline calibration
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Embodiment 1
[0059] Metal oxide electrodes are widely used in the test of hydrogen ion concentration (pH value) in solution. It has excellent short-term response ability, but has the disadvantage of poor stability of electrode potential. If it cannot be taken out from the system and recalibrated, it will cause serious Large test deviations, and even wrong test results.
[0060] Experience shows that the drift of metal oxide electrodes is relatively obvious, and the drift of the freshly prepared electrode is the fastest and the largest; with the extension of the curing time (several months), the drift may gradually decrease, but it still exists. Therefore, for tests that require test accuracy, it is recommended that potential drift calibration be required for long-term monitoring of new electrodes that last for more than 10 minutes, or for old electrodes that last for more than tens of minutes.
[0061] This embodiment provides a compound electrode that eliminates the influence of the poten...
Embodiment 2
[0069] This example adopts the IrO prepared by cyclic thermal oxidation method x The pH electrode is used as the metal oxide pH responsive electrode 1, and silver / silver chloride (Ag / AgCl) is used as the first reference electrode 3-a and the second reference electrode 3-b to verify the metal oxide pH responsive electrode When the front-end electrode 1-a and the back-end electrode 1-b of 1 are stored in the same solution for a long time, whether the electrode potential drift is basically the same. The experimental results are attached Figure 4 shown.
[0070] In the experiment, the buffer solution of pH=3 was used as the solution to be tested, and the above-mentioned buffer solution of pH=3 was also poured into the independent liquid pool 6, and the front electrode 1-a and the rear electrode 1-a of the metal oxide pH response electrode 1 iridium oxide pH electrode were measured. The initial potential of terminal electrode 1-b in the buffer solution of pH=3.00 is E 0 待测 =E...
Embodiment 3
[0072] A method for eliminating the influence of the potential drift of the metal oxide pH electrode itself, the method is applicable to the metal oxide pH composite electrode that eliminates the influence of the potential drift, and the principle of the method for eliminating the influence of the potential drift of the metal oxide pH electrode itself Yes: two different parts of the same metal oxide pH electrode are stored in similar solutions for a long time, and the electrode potential drift of the two parts of the metal oxide pH electrode is basically the same; in addition, the two parts of the metal oxide pH electrode In the process of potential measurement, they are carried out independently and sequentially without affecting each other.
[0073] When measuring the pH value of the solution to be tested, after the independent liquid pool is emptied, the solution to be tested is poured into the independent liquid pool, and the composite electrode is also immersed in the solu...
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