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A kind of nitrite ion selective electrode and preparation method thereof

An ion-selective and nitrite technology, which is applied in the field of nitrite ion-selective electrodes and their preparation, can solve the problems that the selective electrodes are not commercialized, difficult to monitor in real time, and the measurement steps are complicated, and achieve rapid measurement. , continuous measurement, the effect of a wide range of applications

Active Publication Date: 2019-02-15
SHANGHAI WATERINST TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Currently measured H + 、CI - , F - , NO 3 - and Br - Plasma selective electrodes have been widely used, but the determination of NO 2 - The selective electrode of the
Commonly used to measure NO 2 - The ion method is the diazonium salt colorimetric method under acidic conditions. This method has complicated determination steps and takes a long time. 2 - Real-time monitoring of content

Method used

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  • A kind of nitrite ion selective electrode and preparation method thereof
  • A kind of nitrite ion selective electrode and preparation method thereof
  • A kind of nitrite ion selective electrode and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0024] The preparation method of described PVC active membrane is: S1, takes by weighing 1%-4% Schiff's base cobalt II, 50%-65% o-nitrophenyloctyl ether, 0-3% docosyl Ammonium chloride, 0-3% tetrakis (4-chlorophenyl) potassium borate, 25%-43% PVC powder; S2, take a glass ring with a diameter of 40mm and place it on a horizontal glass table, and put the materials in S1 Add it to the glass ring, add 5ml tetrahydrofuran to fully dissolve it; S3, cover the glass ring with filter paper, and then volatilize naturally for 24 hours to obtain the PVC active film. The prepared PVC active film has a thickness of 0.2mm-0.8mm and a diameter of 6mm-8mm. Wherein, the Schiff base cobalt II is bis(3,5-dioctadecylsalicyloyl)-3,4-dimethyldiamine. Its structural formula is:

[0025] .

[0026] The method for preparing the above-mentioned nitrite ion-selective electrode comprises the following steps: A, punch out the PVC active membrane prepared above into a disc with a 6mm aperture; B, take ...

Embodiment 1

[0033] A. The composition of PVC active film

[0034] 1% Schiff base cobalt II, 60% o-nitrophenyloctyl ether, 3% docosyl ammonium chloride, 1% tetrakis (4-chlorophenyl) potassium borate, 35% PVC powder .

[0035] B. Preparation of nitrite ion selective electrode

[0036] S1: Weigh each material according to the material ratio in A;

[0037]S2: Take a glass ring with a diameter of 40mm and place it on a horizontal glass table, add the materials in S1 to the glass ring, add 5ml of tetrahydrofuran to fully dissolve it;

[0038] S3: Cover the glass ring of S2 with filter paper, and then volatilize naturally for 24 hours to obtain the PVC active film;

[0039] S4: Punch out the PVC active film of S3 into a disc with a hole diameter of 6 mm;

[0040] S5: Take the active membrane disc printed in S4 and glue it to the lower end of the PPS electrode tube with epoxy resin, and cure it for 24 hours;

[0041] S6: Add the internal reference solution into the PPS electrode tube of S5, ...

Embodiment 2

[0044] A. The composition of PVC active film

[0045] 4% Schiff's base cobalt II, 50% o-nitrophenyloctyl ether, 1% docosyl ammonium chloride, 3% tetrakis (4-chlorophenyl) potassium borate, 42% PVC powder .

[0046] B. Preparation of nitrite ion selective electrode

[0047] The preparation method is the same as in Example 1.

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Abstract

The invention discloses a nitrite ion selective electrode and a preparation method thereof. The nitrite ion selective electrode comprises an electrode tube body, a redox system solution filled of nitrite is filled in the electrode tube body, a nitrite selective liquid film is arranged at lower end of the electrode tube body, platinum wire is arranged in the electrode tube body for being as an internal reference electrode, the platinum wire is immersed in the redox system solution, a PPS electrode cap, an O-shaped loop for fixing the platinum wire and the electrode tube body are arranged at port of the electrode tube body, the nitrite selective liquid film is a PVC active membrane, The PVC active membrane comprises the following components: 1-4% of schiff base cobalt II, 50-65% of 2-nitrophenyl octyl ether, 0-3% of tridodecylmethylammonium chloride, 0-3% of tetra(4-chlorophenyl) potassium borate and 25-43% of PVC powder. The nitrite ion selective electrode enables accurate determination without interference of anion such as nitrate and chloride ion, defect that the nitrite ions can only be determined under acidic condition by a traditional method can be simultaneously overcome, and the method can be widely used for industrial on-line measurement.

Description

technical field [0001] The invention relates to the technical field of selective electrodes, in particular to a nitrite ion selective electrode and a preparation method thereof. Background technique [0002] Ion-selective electrode refers to an electrode with a sensitive membrane that can selectively respond to ions or molecular substances. Ion-selective electrodes are easy to operate, rapid in measurement and will not destroy the test solution system during measurement, so they are widely used in industrial production control, environmental monitoring, theoretical research, and various fields such as marine, geology, medicine, and chemical industry. [0003] Currently measured H + 、CI - , F - , NO 3 - and Br - Plasma selective electrodes have been widely used, but the determination of NO 2 - Selective electrodes have not yet been commercialized. Commonly used to measure NO 2 - The ion method is the diazonium salt colorimetric method under acidic conditions. This ...

Claims

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Application Information

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IPC IPC(8): G01N27/333
Inventor 张涛
Owner SHANGHAI WATERINST TECH
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