A method of electrochemical-mass spectrometry detection based on glass micron double-tube electrode

A mass spectrometry detection and electrode technology, which is applied in the field of electrochemical-mass spectrometry detection, can solve the problems of online mass spectrometry and electrochemical inability to achieve broad application prospects, improve time resolution, and be easy to use

Active Publication Date: 2018-04-03
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the liquid / liquid interface is usually wrapped by a two-phase solution. Due to this structural feature, liquid / liquid interface electrochemistry cannot be used online with mass spectrometry so far.

Method used

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  • A method of electrochemical-mass spectrometry detection based on glass micron double-tube electrode
  • A method of electrochemical-mass spectrometry detection based on glass micron double-tube electrode
  • A method of electrochemical-mass spectrometry detection based on glass micron double-tube electrode

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Effect test

Embodiment 1

[0034] 1) if figure 1 As shown, insert a silver wire 2 into the carbon electrode 4 tube of the glass micron double-tube electrode to make it contact with the carbon electrode 4, pour 0.5 μL of 5 μM dopamine solution into the empty tube 6 of the double-tube electrode as the solution to be tested, and insert Reference electrode Ag / AgCl electrode 1, due to the hydrophilicity of glass, a thin layer of water film will be formed at the tip to conduct the carbon electrode end with the empty tube end, forming a micro battery;

[0035] 2) if figure 2 As shown, align the tip of the micro-battery in step 1) with the sample inlet 7 of the mass spectrometry detection device, apply a voltage of 1.0V to the micro-battery, and the electrochemical reaction occurs in the micro-battery, and then use the piezoelectric gun 1 to pump the liquid at the tip of the micro-battery After the droplets are ionized and injected into the sample inlet 7, the reaction product dopaquinone produced by the elec...

Embodiment 2

[0039] 1) if Figure 4 As shown, pour 5 μM NH 40.5 μL of Ac solution and insert the reference electrode Ag / AgCl electrode 2, pour 0.5 μL of 5 μM tetrabutylammonium bromide dichloroethane solution into the other tube and insert the silver wire 1, due to the hydrophilic double tube of glass The tip will form a thin layer of water film, which connects the organic phase and the water phase to form a micro battery;

[0040] 2) if Figure 5 As shown, align the tip of the micro-battery in step 1) with the sample inlet 7 of the mass spectrometry detection device, apply a voltage of 1.5V to the micro-battery, the electrochemical reaction of the liquid / liquid interface occurs in the micro-battery, and then use the piezoelectric gun 1 to The droplets at the tip of the microbattery are ionized and injected into the sample inlet 7, and then the electrochemical reaction at the liquid / liquid interface of the solution to be measured can be detected by mass spectrometry.

[0041] Under the ...

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Abstract

The invention discloses an electrochemical-mass spectrometry detection method based on a glass micron double-tube electrode. The method includes: a new technology of glass micron double-tube hybrid electrode (a carbon electrode, a glass empty tube) coupled with mass spectrometry on-line, which is used to study conventional electrochemical (solid / liquid interface) reactions; A new technology of mass electrode (both glass empty tubes) and mass spectrometry online, used to study liquid / liquid interface electrochemistry or electroanalytical chemistry. This method greatly improves the time resolution, and for the first time realizes liquid / liquid interface electrochemistry coupled with mass spectrometry. The combined device has the advantages of simple structure, low cost and convenient use, and has broad application prospects in the fields of conventional electrochemistry, liquid / liquid interface electrochemistry, electroanalytical chemistry, mass spectrometry and the like.

Description

technical field [0001] The invention belongs to the detection field, and relates to an electrochemical-mass spectrometry detection method based on a glass micron double-tube electrode. Background technique [0002] The traditional in situ research methods of electrochemical reactions mainly include cyclic voltammetry, spectroelectrochemical technique and surface scanning probe technique. However, these methods usually lack chemical specificity and can only study relatively simple electrochemical systems. Because mass spectrometry can simultaneously provide accurate molecular weights of various redox reaction products or intermediates, and has high sensitivity, selectivity and rapid detection capabilities, mass spectrometry is very suitable as a detector for electrochemical reactions. However, how to combine mass spectrometry with electrochemistry, especially how to combine mass spectrometry with electrochemical cells to directly detect electrochemical reaction intermediates...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/403G01N27/62
CPCG01N27/403G01N27/62
Inventor 张欣邱然邵元华罗海
Owner PEKING UNIV
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