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Automatic three-spot calibration and temperature compensation method for pH measurer

A technology of temperature compensation and measuring instrument, applied in the direction of electrochemical variables of materials, etc., can solve the problems that the error of the measurement value cannot be fully compensated and the accuracy of the measuring instrument is reduced.

Inactive Publication Date: 2012-05-02
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for a process of continuous pH measurement, the temperature of the environment changes in real time. Manual temperature compensation and single-point calibration will cause the error of the measured value to not be fully compensated, which will reduce the accuracy of the measuring instrument.

Method used

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  • Automatic three-spot calibration and temperature compensation method for pH measurer
  • Automatic three-spot calibration and temperature compensation method for pH measurer
  • Automatic three-spot calibration and temperature compensation method for pH measurer

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with drawings and embodiments.

[0024] The invention adopts the composite glass electrode as the measuring electrode, and the principle of the composite glass electrode conforms to the nernst formula. According to the Nernst equation, the electrode potential is:

[0025]

[0026] E- balance electrode potential (V);

[0027] E. 标 - standard electrode potential (V);

[0028] F-Faraday's constant;

[0029] T is the absolute temperature (K) of the measured solution;

[0030] n - the number of electrons gained or lost;

[0031] R——gas constant, 8.314J / (mol K);

[0032] aOxidation state—the activity of the substance in the oxidation state, mol / L;

[0033] aReduced state—the activity of the reduced state substance, mol / L;

[0034] When the activity a oxidation state and a reduction state of the substance in the electrode reaction in formula (1) are both 1, So E=E at this time 标 .

[0035] E. ...

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Abstract

The invention discloses an automatic three-spot calibration and temperature compensation method for a pH measurer. The method comprises the following steps of: preparing a composite glass electrode as a measuring electrode, using 0.05mol / L potassium hydrogen phthalate solution with the pH1 of 4.01 and the solution of 0.025mol / L monopotassium phosphate and 0.025mol / L disodium hydrogen phosphate with the pH2 of 9.18 to calibrate two spots, calculating a coefficient K by using a nemst equation, and calculating a constant E0 by using the solution of 0.025mol / L monopotassium phosphate and 0.025mol / L disodium hydrogen phosphate with the pH3 of 6.86; and saving the pH1, the pH2 and the pH3 of three types of standard buffer solution, corresponding electrodynamic force E1,E2 and E3, K and E0 in a storage module, reading the K and the E0 during measurement each time, and measuring a temperature value T', and calculating the pH value of the solution by using a formula. The method has the advantages that: the electrodynamic force E0 is eliminated, different pH measuring electrodes can be adapted, and the functions of automatically compensating the temperature in real time and the like are achieved.

Description

technical field [0001] The invention relates to a solution pH value online detection technology, in particular to an automatic three-point calibration and temperature compensation method for a pH measuring instrument. Background technique [0002] The pH value is an important parameter to characterize the activity of hydrogen ions, which has a great influence on the properties of the solution, the rate of chemical reactions, and the metabolism of microorganisms. Especially in the sewage treatment process, the pH value is also an important quality monitoring index. Usually the precise measurement of the temperature of the measured liquid, the temperature compensation of the pH and the calibration of the electrode are the key issues in the design of the high-precision measurement of the pH meter. [0003] The current pH measuring instrument is generally composed of a pH electrode, a single-chip microcomputer, a display screen, an amplifier circuit and an analog-to-digital con...

Claims

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Application Information

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IPC IPC(8): G01N27/26
Inventor 刘海杨慧中
Owner JIANGNAN UNIV
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