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Membrana for lead ion selection electrode with poly-m-phenylenediamine as carrier, production method and uses thereof

A technology of poly-m-phenylenediamine and selective electrodes, which is applied in the direction of material analysis, instruments, and analysis materials through electromagnetic means, can solve the problems of cumbersome carrier synthesis and difficulty in popularization, and achieve the benefits of popularization and application, low cost and low price. The effect of high yield

Inactive Publication Date: 2008-07-16
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synthesis of these carriers is cumbersome, so it is difficult to promote in practical applications.

Method used

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  • Membrana for lead ion selection electrode with poly-m-phenylenediamine as carrier, production method and uses thereof
  • Membrana for lead ion selection electrode with poly-m-phenylenediamine as carrier, production method and uses thereof
  • Membrana for lead ion selection electrode with poly-m-phenylenediamine as carrier, production method and uses thereof

Examples

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preparation example Construction

[0038] Preparation of carrier polym-phenylenediamine

[0039] The carrier poly-m-phenylenediamine was prepared by chemical oxidation synthesis. Dissolve 8.651 g (0.08 mol) of m-diamine monomer in 100 mL of distilled water, ultrasonicate for 3 to 5 minutes to promote its full dissolution, place in a constant temperature water bath at 30°C, and equilibrate for half an hour. Dissolve 0.08 mol of ammonium persulfate oxidizing agent in 100 mL of distilled water and maintain it at 30°C. Add the ammonium persulfate solution dropwise to the monomer solution at a rate of 1 drop / 3 seconds, and start timing at the same time. After the dropwise addition, the reaction was continued for a total of 24h. After the completion of the reaction, filter with suction, and wash the product in the funnel with distilled water until it is washed with BaCl 2 The solution was tested to be free of sulfate ions. After washing, dry at 50°C for 3 days to obtain poly-m-diamine (PmPD).

Embodiment 1

[0041] Weigh 6.06 mg of poly-m-phenylenediamine, 200 mg of PVC, and 400 mg of DOP (dioctyl phthalate), add these four reagents into a beaker, and add 5 mL of tetrahydrofuran to completely dissolve PVC, and sonicate in an ultrasonic instrument for 30 minutes Make the carrier better dispersed. Stir at a constant temperature at 25°C until it becomes viscous, then pour the mixed solution on a flat-bottomed glass, and let it stand for 24 hours. After the tetrahydrofuran is completely volatilized, a film with a weight ratio of PmPD:PVC:DOP=1:33:66 is obtained.

Embodiment 2

[0043] Weigh 10 mg of poly-m-phenylenediamine, 200 mg of PVC, 400 mg of DOP (dioctyl phthalate), and 10 mg of anion removing agent NaTPB. These four reagents were added to a beaker, and 5 mL of tetrahydrofuran was added to dissolve the PVC completely, and the carrier was sonicated for 30 minutes in an ultrasonic instrument to better disperse the carrier. Stir at a constant temperature at 25°C until it becomes viscous, then pour the mixed solution on a flat-bottomed glass, and let it stand for 24 hours. After the tetrahydrofuran is completely volatilized, the weight ratio of PmPD:PVC:DOP:NaTPB=1:20:40:1 is obtained. film.

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Abstract

The invention discloses a film used for selecting an electrode by a lead ion and adopting poly-m-phenylenediamine as a carrier, and is characterized in that the invention comprises poly-m-phenylenediamine, polyvinyl chloride and di-n-octyl phthalate. In addition, the invention also discloses a preparation method and the usage of the film used for selecting the electrode by the lead ion and adopting poly-m-phenylenediamine as the carrier and can be used for detecting the lead ion concentration in solution and used as an instruction electrode of the potentiometric titration of the lead ion.

Description

technical field [0001] The invention relates to a film for a lead ion selective electrode with poly-m-phenylenediamine as a carrier, a preparation method and application thereof. Background technique [0002] Lead ions are ubiquitous in the natural environment and are highly toxic. When the daily intake of the human body exceeds the natural elimination amount of the human body (about 300 μg / day), lead ions are easy to deposit in the human bone structure, which will cause great damage to the human nervous system, immune system, and brain tissue. Along with the increase of lead content in human body, lead poisoning can be directly caused, especially serious damage to brain tissue. Many analytical techniques can be used for the analysis of lead ion content, such as atomic absorption spectrometry (AAS), atomic fluorescence spectrometry (AFS), atomic emission spectrometry (AES), etc. However, the high maintenance and operation costs, the need for professional skills, and some o...

Claims

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Application Information

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IPC IPC(8): C08L27/06C08L79/02C08K5/12C08K5/55C08J5/18G01N27/333
Inventor 黄美荣饶学武李新贵
Owner TONGJI UNIV
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