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Method for long-term observation of pH electrode potential continuous drift compensation and pH dynamic calculation

A technology of drift compensation and electrode potential, which is applied in the direction of complex mathematical operations, etc., can solve the problem of large calculation error of pH value, achieve fast efficiency and accuracy, and ensure the effect of prediction accuracy

Pending Publication Date: 2022-03-29
CENT FOR HYDROGEOLOGY & ENVIRONMENTAL GEOLOGY CGS
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Problems solved by technology

[0005] The present invention proposes a long-term observation pH electrode potential continuous drift compensation and pH dynamic calculation method, and introduces an exponential smoothing prediction method on the long-term drift of the pH electrode, which solves the lack of effective identification and compensation of time drift in the prior art, which causes The problem of large error in pH value calculation

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  • Method for long-term observation of pH electrode potential continuous drift compensation and pH dynamic calculation

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Embodiment 1

[0036] The variable step size self-adaptive exponential smoothing dynamic prediction method in the present invention mainly realizes the intelligence of the moving average method, the primary exponential smoothing method and the secondary exponential smoothing method by judging the size of the smoothing coefficient α and the turning trend of the error square and SSE. Select; establish the continuous function relationship between the sum of squared errors SSE and the smoothness coefficient α by establishing variable step-length search and polynomial curve fitting least squares method, and then solve f'(α)=0 to realize the dynamic fast optimization of the smoothness index α, and the error The sum of squares SSE is used as the main basis for evaluating the quality of the smoothing coefficient α, which realizes the automatic adjustment of the smoothing coefficient α and ensures the prediction accuracy of exponential smoothing. Compared with global search optimization, it has faster...

Embodiment 2

[0056] The electrode drift time series dynamic update method in the present invention is to start updating after the initial pH electrode calibration, according to the characteristics of the electrode response potential daily decrease ≦ 1mV, so whether the electrode potential difference is less than 1mV / day is used as a judgment. The threshold at which drift occurs. When the electrode potential difference is greater than 1mV / day, it is determined that the monitoring failure is invalid, and the electrode drift is consistent with the last time. Through the dynamic update of the electrode drift time series, it only needs to be calibrated once before the pH electrode is installed, and the long-term dynamic monitoring of the pH value without calibration can be realized.

[0057] The specific steps of the dynamic update method of electrode drift time series are as follows:

[0058] (1) Start the long-term monitoring of the pH value after the initial pH electrode calibration, set th...

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Abstract

The invention relates to the technical field of pH electrode calibration, and provides a long-term observation pH electrode potential continuous drift compensation and pH dynamic calculation method, which comprises a variable step size adaptive exponential smoothing dynamic prediction method, and specifically comprises the following steps: judging the size of a smoothing coefficient alpha and the turning trend of an error sum of squares SSE; and establishing a variable step size search and polynomial curve fitting least square method to establish a continuous function relationship between the sum of squares SSE and the smoothing coefficient alpha, and then solving f '(alpha) = 0 to realize dynamic rapid optimization of the smoothing index alpha. According to the technical scheme, the drift distance of the electrode can be predicted more quickly and accurately, the response potential actually detected by the pH electrode can be corrected through the predicted drift distance of the electrode, the corrected response potential is input into the Nernst equation for operation, a more accurate pH value is obtained, and long-term in-situ monitoring of the pH electrode without calibration is achieved.

Description

technical field [0001] The invention relates to the technical field of pH electrode calibration, in particular to a long-term observation pH electrode potential continuous drift compensation and pH dynamic calculation method. Background technique [0002] pH value is an important routine index of groundwater environmental quality and pollutant control. In recent years, with the urgent requirements of groundwater environment monitoring and groundwater pollution early warning, in-situ online monitoring of groundwater has gradually replaced manual monitoring, in order to obtain real-time, real and accurate monitoring data of groundwater, and timely control the water quality of groundwater. [0003] However, due to the continuous change of the hydration layer structure of the glass working electrode of the electrode sensor, the change of the electrolyte of the reference electrode, and the complex variability of the application environment, the response voltage output of the elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/18
CPCG06F17/18
Inventor 赵学亮魏光华郭颖平李康袁爱军庞丽丽
Owner CENT FOR HYDROGEOLOGY & ENVIRONMENTAL GEOLOGY CGS
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