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Current detection method of ion selective electrode

An ion-selective, current-detecting technology, applied in measurement devices, materials electrochemical variables, material analysis by electromagnetic means, etc. Long time, unfavorable rapid measurement and other problems, to achieve the effect of easy acquisition and configuration, highly sensitive measurement of signal amplification, and fast response time

Pending Publication Date: 2021-11-02
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

However, there are few technical reports on reading the potential response of ion-selective electrodes with current as the output signal. For example, the Coulomb analysis technology proposed by Bobacka's research group obtains the Coulomb signal by integrating the instantaneous current (Anal.Chem.88(2016)4369-4374 ) to read the electrode potential response
Although this technology can measure small concentration changes, it is limited by the type of solid contact conductive layer and the thickness of the ion-selective sensitive membrane. If it is not strictly controlled, the response time of the Coulomb signal will be longer, which is not conducive to rapid measurement.

Method used

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Examples

Experimental program
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Embodiment 1

[0030] Characterization of potential of bare glassy carbon electrode as a function of calcium ion concentration when solid contact calcium ion selective electrode is used as reference electrode. Specifically include:

[0031] (1) Take two glassy carbon electrodes, respectively use 0.05μm Al 2 o 3 The powder is polished until the surface of the electrode is a bright mirror surface, and it is ultrasonically cleaned in ultrapure water, ethanol and ultrapure water in sequence, and it is used as a working electrode or an ion selective electrode matrix for later use;

[0032] (2) Take 60 μL of ordered mesoporous carbon solution (3 mg / mL) and drop-coat it on the glassy carbon electrode in step (1), and dry at room temperature to obtain ordered mesoporous carbon modified glassy carbon electrode;

[0033] (3) Weigh 4.14mg of N,N,N',N'-tetracyclohexyl-3-oxaglutaramide, 4.32mg of tetrakis(3,5-bis(trifluoromethyl)phenyl)sodium borate , 57.24 mg of polyvinyl chloride and 110 μL of 2-nit...

Embodiment 2

[0039] Current vs. voltage characterization of a potassium ferricyanide redox probe on a bare glassy carbon electrode. Specifically include:

[0040] (1) Build according to the steps described in Example 1, the difference is that the step (5) device in Example 1 is adjusted, and the Ag / AgCl (3M KCl) electrode is placed on a 10 -2 In the beaker 2 of the M NaCl solution, the beaker 1 and the beaker 2 are connected by a salt bridge;

[0041] (2) Connect the three electrodes in step (1) to the CHI660C electrochemical workstation, select the multi-potential step technology, and set the voltage values ​​in sequence: 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50V, the application time under each voltage is 20s, and the current of the potassium ferricyanide redox probe on the bare glassy carbon electrode changes with the voltage (see image 3 ).

[0042] Such as image 3 As shown, when the Ag / AgCl (3M KCl) commercial electrode is used as the reference electrode, the c...

Embodiment 3

[0044] Characterization of the current variation of the potassium ferricyanide redox probe on the bare glassy carbon electrode as a function of calcium ion concentration. Specifically include:

[0045] (1) Construct according to the steps described in Example 1, the difference is that the step (5) device in Example 1 is adjusted, a solution of 5 mM potassium ferricyanide and potassium ferrocyanide is placed in the beaker 1, and the three electrodes are connected Go to the CHI660C electrochemical workstation, select i-t technology, set the voltage between the bare glassy carbon electrode and the calcium ion electrode to -0.2V, gradually increase the calcium ion concentration in the solution, and obtain the potassium ferricyanide redox probe current with the calcium ion concentration. Change real-time response graph ( Figure 4 ), and obtain the corresponding calibration curve ( Figure 5 ).

[0046] Depend on Figure 4 and 5 As shown, with the increase of calcium ions, the...

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Abstract

The invention relates to the field of electrochemical sensors, and in particular, relates to a current detection method of an ion selective electrode. A redox probe is used as an indication, and quantitative detection of to-be-detected ions is realized according to the activity (concentration) of the to-be-detected ions and the current signal change of the redox probe. The redox probe is used for indicating the potential signal of the ion selective electrode, and the relationship between the ion activity and the potential signal in the Nernst equation is converted into the relationship between the ion activity and the current signal, so that signal amplification and high-sensitivity ion measurement are realized.

Description

technical field [0001] The invention relates to the field of electrochemical sensors, in particular to a current detection method of an ion-selective electrode. Background technique [0002] The ion-selective electrode is an important branch of electrochemical sensors, and its detection principle is based on the relationship between the response potential of the sensitive membrane and the ion activity of the analyte in accordance with the Nernst equation (Chem.Rev.108(2008)329- 351). Compared with other detection technologies, ion-selective electrodes have the characteristics of good selectivity, fast response speed, real-time in-situ detection of ion concentration changes, etc., and have incomparable advantages in ion analysis (Sci.Total Environ.537(2015 )453-461). However, the resolution of the measured potential signal can only reach 0.1mV at present. According to the calculation of the Nernst slope (59.1 / n mV / dec, n is the number of charges), the deviation of the measu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/333G01N27/26G01N27/48
CPCG01N27/333G01N27/26G01N27/48
Inventor 尹坦姬秦伟孙小彤张资平
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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