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Mercury-ammonium nitrate based mercury reference electrode as well as preparation method and application thereof

A technology of amino nitrate and reference electrode, which is applied in the field of electrochemical measurement, can solve the problems of polluting the test solution and distortion of measurement results, and achieve stable electrode potential, accurate potential reference, and simple production

Active Publication Date: 2017-06-13
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when electrochemical tests are carried out in aqueous solutions that do not contain these ions, such as when the corrosion of metals is studied in pure water with ammonia added to adjust the pH, the chloride ions in the filling solution in the calomel electrode will diffuse into the pure water, polluting the test solution , resulting in distortion of measurement results, the same problem exists in several other reference electrodes

Method used

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  • Mercury-ammonium nitrate based mercury reference electrode as well as preparation method and application thereof
  • Mercury-ammonium nitrate based mercury reference electrode as well as preparation method and application thereof
  • Mercury-ammonium nitrate based mercury reference electrode as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Hg(NH 2 )NO 3 Synthesis: Prepare 1mol / L HNO in a 500mL beaker 3 Solution 300mL, weigh 32.5g HgO powder on electronic balance, pour HNO 3 in solution. Put the beaker in a water bath, keep the temperature at 55°C, and stir the solution with a glass rod to fully dissolve the HgO. After 30 min, HgO has completely dissolved. Add dropwise 25% (mass fraction) ammoniacal liquor 20mL in the solution, generate a large amount of white precipitates in the solution, continue dripping ammoniacal liquor 20mL, the amount of the white solid that separates out does not increase significantly. The solution was left to stand naturally to allow the precipitate to settle completely, the upper clear layer was poured off, and the white precipitate was washed repeatedly with desalinated water until the pH of the washing water was greater than 6.0. Finally, filter the white precipitate, put it in an oven, and dry it at 60°C. The obtained dry solid powder is aminomercuric nitrate (Hg(NH 2 )...

Embodiment 2

[0046] Preparation of mercury-aminomercuric nitrate paste: Weigh 5.00g of aminomercuric nitrate powder and 1.25g of mercury simple substance with an electronic balance, put the two into a quartz mortar and mix, add 8-10 drops of 25% with a dropper Ammonia, grind until the mixture is evenly ground, and put the ground paste into a fume hood to dry naturally for 2 hours. Finally, a mercury-aminomercuric nitrate paste is obtained.

Embodiment 3

[0048] Assembling the electrodes: In an inner glass sleeve with openings at both ends, a length of 10 mm, and an inner diameter of about 5 mm, plug the lower port with a cotton ball, and drop a few drops of desalted water on the cotton to make it moist. Spread about 2.0g of the mercury-aminomercuric nitrate paste in embodiment 2 on the absorbent cotton ball, and then spread about 1.0g of elemental mercury 3 on the mercury-aminomercuric nitrate paste. Put the inner glass sleeve on the outer glass tube, and the upper ends of the outer glass tube and the inner glass sleeve are glued to the polyethylene sealing plug with superglue, punch a hole in the center of the polyethylene sealing plug, and insert the platinum wire into the mercury-nitric acid hole In the aminomercury paste, the hole of the polyethylene sealing plug is sealed with glass glue. The lower end of the outer glass tube is plugged into porous ceramics, and 10% ammonia water is injected through the pores until the li...

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Abstract

The invention discloses a mercury-ammonium nitrate based mercury reference electrode as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing a mercury-ammonium nitrate based mercury paste Hg(NH2)NO3 white solid, which is capable of stably existing in ammonia water, through a chemical synthesis method, mixing the mercury-ammonium nitrate based mercury paste Hg(NH2)NO3 white solid and elemental mercury, and grinding a mixture to prepare a mercury-ammonium nitrate based mercury paste. An electrode potential of electrode reaction formed by the paste and the ammonia water is very stable, so that accurate electric potential reference can be supplied without causing ion pollution to a measurement medium; and meanwhile, the mercury-ammonium nitrate based mercury reference electrode also has the advantages of simpleness in manufacturing, low cost and the like and is particularly suitable for electrochemical measurement of an ammonia-containing pure water system.

Description

technical field [0001] The invention belongs to the technical field of electrochemical measurement, and in particular relates to a novel mercury-aminomercury nitrate reference electrode and a preparation method and application thereof. Background technique [0002] Electrochemical measurement technology is an important means of metal corrosion and primary battery performance detection, such as potentiodynamic scanning, electrochemical impedance spectroscopy, electrochemical noise, voltammetric polarization and other technologies have been widely used. When carrying out electrochemical tests, it is necessary to establish a measuring electrode system first. The most commonly used is a three-electrode system: working electrode, reference electrode and auxiliary electrode. The function of the reference electrode is to provide a potential reference for the working electrode to ensure that the measuring instrument Accurate potential perturbation can be applied to the working elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30
CPCG01N27/301
Inventor 查方林刘凯周舟冯兵吴俊杰王凌徐松
Owner STATE GRID CORP OF CHINA