Method for producing polymer membrane silver ion selective electrode

A silver ion, selective technology, applied in the direction of material analysis, measuring devices, instruments, etc. by electromagnetic means, can solve the problems of large amount of ion exchange resin, difficulty in miniaturization, short electrode life, etc., and achieve low detection limit, High selectivity, long life effect

Inactive Publication Date: 2010-06-23
YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods can effectively improve the detection limit of polymer membrane ion-selective electrodes, but they all have their own shortcomings: such as a large amount of ion exchange resin, it is difficult to miniaturize; organic complexing agents are easy to penetrate into the polymer membrane, making the electrode life very short ; These methods all use the Ag / AgCl electrode as the internal reference electrode

Method used

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  • Method for producing polymer membrane silver ion selective electrode
  • Method for producing polymer membrane silver ion selective electrode
  • Method for producing polymer membrane silver ion selective electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Weigh 0.17197g polyvinyl chloride, 0.31628g o-nitrophenyloctyl ether, 0.00247g tetrakis[3,5-bis(trifluoromethyl)phenyl]sodium borate, 0.00539g13,15,16, 18,20,26-Hexahydrotriphenyl[b,n,r][1,7,10,16,4,13]-tetrathiodiazaeicos-12,19(5H,11H) - Diketones are mixed, dissolved in tetrahydrofuran as a solvent, and stirred until transparent. The solution was poured on a horizontal glass plate to make a 0.25 mm film. Cut out a diaphragm with an inner diameter of 6 mm, and stick it to the end of the PVC plastic pipe with a PVC tetrahydrofuran solution. to 10 -2 M NaCl and 10 -5 MAgNO 3 For inner filling, use 10 -5 M silver nitrate solution was activated for 48 hours to prepare a silver ion polymer membrane electrode with a low detection limit, and the silver wire was used as an internal reference electrode to measure silver ions. Electrodes at 10 -9 M-10 -5 Nernst response in the M range.

Embodiment 2

[0022] Weigh 0.17192g polyvinyl chloride, 0.31621g dioctyl phthalate, 0.00249g tetrakis[3,5-bis(trifluoromethyl)phenyl]sodium borate, 0.00535g13,15,16 in a weighing bottle , 18,20,26-hexahydrotriphenyl[b,n,r][1,7,10,16,4,13]-tetrathiodiazaeicos-12,19(5H,11H )-diketone mixed, dissolved in tetrahydrofuran as a solvent, and stirred until transparent. The solution was poured onto a horizontal glass plate to produce a 0.26mm film. Cut out a diaphragm with an inner diameter of 6 mm, and stick it to the end of the PVC plastic pipe with a PVC tetrahydrofuran solution. to 10 -2 M NaCl and 10 -5 M AgNO 3 For the inner filling liquid, use 10 -5 M silver nitrate solution was activated for 48 hours to prepare a silver ion polymer membrane electrode with a low detection limit, and the silver wire was used as an internal reference electrode to measure silver ions.

Embodiment 3

[0024] Weigh 0.34605g polyvinyl chloride, 0.17962g dioctyl phthalate, 0.00247g tetrakis[3,5-bis(trifluoromethyl)phenyl]sodium borate, 0.00539g13,15,16 in a weighing bottle , 18,20,26-hexahydrotriphenyl[b,n,r][1,7,10,16,4,13]-tetrathiodiazaeicos-12,19(5H,11H )-diketone mixed, dissolved in tetrahydrofuran as a solvent, and stirred until transparent. The solution was poured onto a horizontal glass plate to produce a 0.26mm film. Cut out a diaphragm with an inner diameter of 6 mm, and stick it to the end of the PVC plastic pipe with a PVC tetrahydrofuran solution. with 1M NaCl and 10 -5 M AgNO 3 For the inner filling liquid, use 10 -5 M silver nitrate solution was activated for 48 hours to prepare a silver ion polymer membrane electrode with a low detection limit, and the silver wire was used as an internal reference electrode to measure silver ions.

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Abstract

The invention discloses a method for producing a polymer membrane silver ion selective electrode. Crown ether compound which comprises amide groups and sulfur heteroatoms is used as silver ion carrier and is mixed with polyvinyl chloride, plasticizer and ion exchanging agent according to a certain proportion. Inorganic salt which comprises anions which can form slightly soluble matters with silver ions is used to adjust the concentration of interfering ions and main ions in internally filled liquid. The polymer membrane silver ion selective electrode membrane forming and activating conditions are optimized, the seepage of main irons of an inner membrane phase to sample solution is effectively reduced, and the polymer membrane silver ion selective electrode detection limit is made to comply with theoretical prediction value (less than 10-10mol/L). The polymer membrane silver ion selective electrode has good silver ion nernst response and silver ion selectivity. The method for producing the polymer membrane silver ion selective electrode overcomes the defect that the complexing agent used for the internally filled liquid of a polymer membrane electrode of low detection limit is easy to seep into a polymer membrane and the iron exchange resin is hard to miniaturize. The performance of the polymer membrane silver ion selective electrode can not be reduced in one month.

Description

[0001] The invention belongs to the technical field of preparation of ion-selective electrodes, in particular to a preparation method of a polymer membrane silver ion-selective electrode with a low detection limit. Background technique [0002] Polymer-sensitive membrane ion-selective electrodes are an important branch of chemical sensors, and their detection principle is based on the relationship between the response potential of the sensitive membrane and the ion activity of the analyte according to the Nernst equation. The performance of ion-selective electrodes depends on ionophores with good selectivity immobilized in hydrophobic membranes. The two sides of the ion-selective membrane are respectively in contact with the sample solution and the internal reference solution, and the selectivity of the sensor depends on the reversible bonding between the ion carrier and the ion to be measured in the membrane phase. The detection limit of traditional polymer membrane ion-selec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/333
Inventor 胡学锋秦伟尹坦姬张军
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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