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A method for real-time measurement of gas ph value with ph electrode

A technology for real-time measurement of gas to be measured, applied in measurement devices, electrochemical variables of materials, material analysis by electromagnetic means, etc. The effect of small buffer capacity and simple measurement method

Inactive Publication Date: 2016-02-17
SICHUAN UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the buffer solution coated on the surface of the pH electrode cannot completely extract the gas, and has a certain influence on the slight change of the gas pH. In addition, the electrode has a certain equilibrium time, so the measured pH cannot reflect the real value. Gas pH
This method is convenient and quick, but the disadvantage is that the pH meter is not suitable for the direct determination of gas phase substances
This method is very similar to the method proposed by Sensarbaugh et al. Although it solves the problem that the buffer solution on the surface of the pH electrode cannot completely extract the gas to a certain extent, the operation is more complicated, and the buffer still has a certain influence on the slight change of the gas pH. this question

Method used

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  • A method for real-time measurement of gas ph value with ph electrode
  • A method for real-time measurement of gas ph value with ph electrode
  • A method for real-time measurement of gas ph value with ph electrode

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Effect test

Embodiment 1

[0015] Embodiment 1, we form absorption liquid film on the glass membrane surface of pH electrode with 50% glycerol aqueous solution, have measured the pH value of the sample gas containing carbon dioxide, obtained the signal response figure of the sample gas measured by this method, see figure 2 . It can be seen from the figure that after the gas enters the flow cell, the potential increases gradually and tends to be stable. Due to the pK of glycerol in water a is 14.15, glycerol in glycerol aqueous solution can be regarded as buffer component, and glycerol aqueous solution can be regarded as HB-B - Type buffer system, the calculation formula of buffer capacity is , where [H + ] and [OH － ] are respectively H in the solution + and OH － The concentration of c is the total concentration of glycerol. The buffer capacity of 50% glycerin aqueous solution can be calculated by the formula to be 1.07×10 -6 mol L -1 ·pH -1 , it can be seen that the buffer capacity of this ...

Embodiment 2

[0016] Embodiment 2, in order to better describe the present invention, we take 10% PEG-20000 aqueous solution to form the absorption liquid film on the glass membrane surface of pH electrode, the sample gas of different carbon dioxide content is taken as the gas to be measured as example, the present invention is elaborated , the content of carbon dioxide is obtained by adjusting the volume ratio of carbon dioxide and nitrogen.

[0017] In order to establish a simple and stable method for real-time measurement of the gas pH value, the present invention investigates the secondary water with a PEG-20000 content of 0% and the aqueous solution with a PEG-20000 content of 10% formed on the surface of the glass membrane of the pH electrode. The effect of absorbing liquid film on the stability and responsiveness of the test system. In order to further investigate the stability of the detection system, the present invention conducts statistical analysis on the stability of the absorp...

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Abstract

The invention discloses a method for measuring the pH value of gas in real time by a pH electrode; the method is suitable for the field of researching the product quality by measuring the pH value of gas. The method comprises the steps of putting the pH electrode into water solution of macromolecule materials such as polyethylene glycol-20000, polyvinyl alcohol and starch as micromolecule materials such as polyethylene glycol-200 and glycerine, and forming a liquid absorption film on the surface of a glass film of the pH electrode; quickly putting the electrode into a circulation tank, feeding the gas to be tested after a system is stable; detecting the change of the pH electrode caused by the gas to measure the pH value of the gas. The method has the advantages that the liquid absorption film arranged on the surface of the glass film of the pH electrode is small in buffer capacity and hardly has interference for the small change of the pH value of the gas, and the water in the liquid absorption film is not easily volatilized, so that the method is beneficial to the stability of the system; due to the structure of the circulation tank, the gas to be tested is fully contacted with the liquid absorption film, so that the pH electrode can make rapid response to the gas; the method is simple, convenient and rapid, and can be used for continuously measuring the pH value of the gas in real time.

Description

technical field [0001] The invention relates to a method for measuring the pH value of gas in real time with a pH electrode, which is suitable for the field of researching product quality by measuring the pH value of gas. Background technique [0002] Studies have shown that non-neutral gaseous substances (such as SO 2 , CO 2 , HCl, H 2 S, NH 3 etc.) has a great influence on the pH of the surrounding environment, and the acidity and alkalinity of the gas has a great impact on the quality of the product in this environment; especially HF, SO 2 Such highly toxic and corrosive substances are extremely harmful to the human body. In recent decades, as one of the important parameters for product control and quality assessment in industrial production, the pH of gas has received extensive attention in many fields. For example, in the SCR process of ammonia / urea, measuring the pH of the gas can control the concentration of ammonia; in the tobacco industry, measuring the pH of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26G01N27/333G01N27/00
Inventor 肖丹杨钦兰郭勇朱晓琼
Owner SICHUAN UNIV
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