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A kind of solid contact polymer film lead ion selective electrode and its application

A polymer film, lead ion technology, applied in the direction of material analysis, measurement device, instrument, etc. by electromagnetic means, can solve the problems of limiting the application of conductive polymers, and achieve increased electrochemical active surface area, good reproducibility, and response. fast effect

Active Publication Date: 2018-05-18
YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Conducting polymers were previously reported as ion-electron conducting layers in solid-contact ion-selective electrodes; however, redox side reactions occurred between ion-selective films and conducting polymers due to the presence of dissolved oxygen, and at the same time There is also an unavoidable water layer, these deficiencies limit the application of conductive polymers

Method used

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  • A kind of solid contact polymer film lead ion selective electrode and its application
  • A kind of solid contact polymer film lead ion selective electrode and its application
  • A kind of solid contact polymer film lead ion selective electrode and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The specific preparation steps of the solid contact polymer membrane lead ion selective electrode are as follows:

[0029] a. Preparation of sensitive film: a mixture of PVC particles, o-nitrophenyl octyl ether, lead ionophore and sodium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate total 250mg, of which 32.85wt% PVC particles, 65.71wt% o-nitrophenyl octyl ether, 1.0wt% lead ionophore and 0.44wt% sodium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, transferred to 2.0ml tetrahydrofuran solution , Ultrasound and stir for 2h to make it evenly dispersed.

[0030] b. Hexagonal disc shape double die hole C 60 Preparation: Weigh 7mg of C 60 Powder, dissolve it in 10ml mixed solution of carbon tetrachloride:benzene=9:1 (v / v), filter it under 100W power for 45min, get C 60 The saturated solution should be placed in a refrigerator at 5°C for later use. Take 1ml of C 60 Put the saturated solution in a 15ml glass bottle, and then slowly add 5ml of isopropanol (maintaining the rate o...

Embodiment 2

[0035] The electrode obtained above should be in 10 -3 M lead nitrate activated for 30h, and then 10 -9 M is activated in lead nitrate for two days.

[0036] Insert the activated electrodes into the lead nitrate solution containing a series of different concentrations (the concentration of lead nitrate solution is 10 -3 , 10 -4 , 10 -5 , 10 -6 ,10 -7 , 10 -8 , 10 -9 , 10 -10 mol / L) to generate a potential response signal (see figure 2 ).

[0037] by figure 2 It can be seen that with double die hole C 60 The solid contact polymer membrane lead ion selective electrode with solid contact layer has a very sensitive potential response and can finally detect 10 -10 mol / L lead ion concentration, and the potential is 10 -4 -10 -7 Nernst response is present in the mol / L range.

[0038] Then insert the activated electrodes into 10 -3 1.5h in mol / L lead nitrate solution, 10 -1 mol / L calcium nitrate solution for 3h, 10 -3 mol / L lead nitrate solution for 12h for water layer test (see image 3 )...

Embodiment 3

[0042] a. Electrophoresis deposition double mold hole C 60 :Combine the synthesized double-die hole C 60 First dissolve in toluene, and mix the dissolved mixture with acetonitrile again at a volume ratio of 1:3 to form a suspension of 0.05 mg / ml. Under the condition of 5V voltage, accompanied by 800r p m Magnetic stirring deposition for 12 minutes, it can be deposited on the surface of the glassy carbon electrode to obtain a uniform and dense C with a thickness of 0.15mm 60 Sedimentary layer.

[0043] b. The rest of the implementation steps refer to step d of Example 1 and Example 2, and a solid contact polymer membrane lead ion selective electrode can be obtained. -3 -10 -10 The potential change response of M lead nitrate solution and the electrode at 10 -3 Water layer test in M ​​lead nitrate solution.

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Abstract

The invention relates to a solid contact polymer film lead ion selective electrode and its application. Solid-contact polymer film lead ion-selective electrode is synthesized by liquid-liquid interfacial co-precipitation method with hexagonal disc-like morphology bimodal pores C60 with macropore and mesoporous structure deposited on glassy carbon as ion-electronic conducting layer electrode surface with a sensitive membrane attached to the ion-electron conducting layer. The conductive layer C60 material used in the present invention has a dual-mode pore structure, which can increase the electrochemically active surface area of ​​the material and accelerate the ion-electron conduction rate. The electrophoretic deposition method can form a layer of dense double-mode porous C60 film on the surface of the glassy carbon electrode, which enhances the stability of the solid contact polymer film lead ion selective electrode. The preparation of this new type of polymer film lead ion selective electrode based on the double-mode hole C60 solid contact layer is fast and simple, and does not need to be time-consuming and laborious like the drop coating method, which improves the practicability of the electrode.

Description

Technical field [0001] The invention relates to a method for detecting heavy metal lead ions, in particular to a solid contact polymer membrane lead ion selective electrode and its application. Background technique [0002] As a kind of electrochemical sensor, ion selective electrode is the most important development of potentiometric method since the 1960s and has become a new hot spot in the field of chemical sensors. Because of its high sensitivity, good selectivity, convenient carrying, and online analysis and monitoring, this method has always been highly concerned by scientific researchers. It has been successfully used in industrial analysis, environmental monitoring, marine pollution monitoring, soil analysis, and medical treatment. And other fields. It should be pointed out that the ion selective electrode with internal filling structure is not suitable for some applications, especially miniaturized electrodes. For this reason, the internal filling liquid has been repl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/333
Inventor 秦伟李敬慧尹坦姬
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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