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Thin-layer polymer membrane ion selective electrode based on pulse constant current control and detection method

A technology of ion selectivity and detection method, which is applied in the field of thin-layer polymer sensitive membrane solid contact ion-selective electrode and detection, can solve the problems of tedious controllability and time-consuming, achieve strong controllability and improve detection Efficiency and ease of operation

Pending Publication Date: 2022-05-27
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

[0004] Generally, although the detection efficiency of the electrode can be improved, if the thin-layer polymer sensitive membrane solid-contact ion-selective electrode is to be used repeatedly, the electrode needs to be soaked in an acid solution after the test is completed, which is time-consuming. , cumbersome and poor controllability; and the above problems need to be solved

Method used

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  • Thin-layer polymer membrane ion selective electrode based on pulse constant current control and detection method
  • Thin-layer polymer membrane ion selective electrode based on pulse constant current control and detection method
  • Thin-layer polymer membrane ion selective electrode based on pulse constant current control and detection method

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Effect test

Embodiment 1

[0035] The specific preparation steps of the thin-layer polymer sensitive membrane solid contact copper ion selective electrode are as follows:

[0036] a. Preparation of sensitive film solution: a mixture of PVC particles, o-nitrophenyl octyl ether, copper ionophore and tetradecylammonium tetrakis(4-chlorophenyl)borate totals 250 mg, of which 29.7 wt% of PVC particles, 59.3wt% o-nitrophenyl octyl ether, 1.0wt% copper ionophore and 10wt% tetradecylammonium tetrakis(4-chlorophenyl)borate were transferred into 2.5ml tetrahydrofuran solution, ultrasonicated and stirred for 2h to disperse evenly. Then take 50 μl of the original polymer sensitive membrane solution and dilute it into 1 ml of tetrahydrofuran solution to obtain the final ready-to-use sensitive membrane solution.

[0037] b. Preparation of solid contact layer: prepared by one-step electrochemical co-reduction of graphene oxide and chloroplatinic acid on the surface of a conductive substrate by cyclic voltammetry using...

Embodiment 2

[0044] The reuse steps of the thin-layer polymer-sensitive membrane solid-contact copper ion selective electrode are as follows:

[0045] a. The preparation and implementation steps of the sensitive film solution are carried out with reference to step a of Example 1.

[0046] b. The preparation and implementation steps of the solid contact layer are carried out with reference to step b of Example 1.

[0047] c. Preparation of thin-layer polymer-sensitive membrane solid-contact polymer-membrane copper ion-selective electrode and activation implementation steps are carried out with reference to step c of Example 1.

[0048] d. After applying a current pulse of 1s and 0.8μA, continue to apply a potential baseline pulse to investigate that the concentration is 10 -3 M Cu 2+ The reversibility of the potential response was tested in four replicates. The result is as Figure 4 As shown in the figure, from left to right in the figure are the chronopotentials after four times of pu...

Embodiment 3

[0050] The specific preparation steps of the thin-layer polymer sensitive membrane solid contact calcium ion selective electrode are as follows:

[0051] a. Calcium ionophore is used in the preparation of the sensitive membrane solution, and the rest of the implementation steps are carried out with reference to step a of Example 1.

[0052] b. Implementation steps are carried out with reference to Step b and Example 2 of Example 1, and a thin-layer polymer-sensitive membrane solid-contact calcium ion-selective electrode can be obtained.

[0053] c. The implementation steps were carried out with reference to step c of Example 1 and Example 2, and the influence of the applied pulse current size and time on the detection of calcium ions by the solid contact ion selective electrode of the thin-layer polymer sensitive membrane was investigated.

[0054] d. Determination of 10 under the background condition of 0.5M sodium chloride -3 -10 -7 Calcium ion chronopotentiodynamic respon...

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Abstract

The invention relates to a method for detecting various common ions, in particular to a thin-layer polymer sensitive film solid contact type ion selective electrode based on pulse constant current control and a detection method. A solid contact layer of a carbon-based nano material / metal nanoparticle compound is deposited on the surface of a conductive substrate of the thin-layer polymer sensitive film solid contact type ion selective electrode based on pulse constant current control, and the surface of the solid contact layer is coated with a thin-layer polymer sensitive film with the thickness of micrometer to nanometer. According to the thin polymer sensitive film, the pre-activation time of the electrode can be effectively shortened, and the detection performance of the electrode can be further improved. In addition, the thin-layer polymer film solid contact type ion selective electrode based on pulse constant current control also shows excellent reversibility, and has a wide application prospect in the aspect of ion detection.

Description

technical field [0001] The invention relates to a method for detecting various common ions, in particular to a thin-layer polymer sensitive film solid-contact ion-selective electrode based on pulse constant current control and a detection method. Background technique [0002] Since the 1960s, ion-selective electrodes, as an important branch of electrochemical sensors, have made important progress and have become a new hot spot in the field of chemical sensors. Ion selective electrodes have the characteristics of high sensitivity, good selectivity, easy to carry, and can be used for online analysis and monitoring. They have been successfully used in industrial analysis, marine environment monitoring, medical and health, soil analysis and other fields. It should be noted that conventional ion-selective electrodes contain an internal filling fluid, which limits their practical application, especially for the construction of miniaturized electrodes. Based on this, the solid con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/333G01N27/416C25D7/00C25D15/00
CPCG01N27/3335G01N27/4161C25D15/00C25D7/00
Inventor 秦伟李敬慧
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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