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Micro-electrolytic tank for detecting formaldehyde and preparation method thereof

A micro-electrolytic cell and formaldehyde technology, applied in the direction of material electrochemical variables, etc., can solve the problems of unsuitable microfluidic electrochemistry, insufficient linear range, and difficult to achieve detection limit, etc., to achieve good chemical inertness and light transmittance The effect of good and excellent acid and alkali resistance

Active Publication Date: 2018-06-12
DALIAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this structure is only suitable for macroscopic electrochemical reactions, not for microfluidic electrochemical research.
And the isolation structure will reduce the conductivity of the solution, which will affect the accuracy of the experiment
In addition, in order to ensure the conductivity of the solution, we need to add more electrolyte solution, which will increase the test cost and cause waste of reagents
Although the use of electrochemical methods to detect formaldehyde can simplify the detection process, improve the sensitivity of detection, and reach a lower detection limit, the detection limit of this method is still difficult to reach 10 -7 mg / ml and below, and the linear range of detection is not wide enough

Method used

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  • Micro-electrolytic tank for detecting formaldehyde and preparation method thereof
  • Micro-electrolytic tank for detecting formaldehyde and preparation method thereof
  • Micro-electrolytic tank for detecting formaldehyde and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] 1. Preparation of formaldehyde solution

[0037] Weigh 25mg of formaldehyde, place it in a 25mL volumetric flask, and dilute it to the standard mark of the volumetric flask with PBS solution of pH=6. Configured as a 1mg / mL formaldehyde solution.

[0038] 2. Preparation of PDMS mold

[0039](1) Heat the silicon wafer directly in a rubber drying table at 200°C for 15 minutes, then take out the silicon wafer and place it in a petri dish to cool to room temperature.

[0040] (2) Prepare the channel mold by using industrial-grade 3D printing technology. Spin-coating technique was used to bond the channel mold to the silicon wafer to prepare the PDMS template.

[0041] 3. Fabrication of PDMS cell body

[0042] Pour PDMS liquid A (monomer) and liquid B (initiator) into a beaker at a mass ratio of 10:1, stir with a glass rod for 5 minutes, and then pour into the above-mentioned Petri dish equipped with a silicon chip. The culture dish was placed in a concentrated desiccato...

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Abstract

The invention relates to a micro-electrolytic tank for detecting formaldehyde and a preparation method thereof. The micro-electrolytic tank is of a four-layer structure, the upper layer and the lowerlayer of the micro-electrolytic tank are acrylic plates, the two middle layers are a PDMA tank body and ITO glass respectively, a counter electrode inserting hole is formed in one side of the PDMA tank body, a reference electrode inserting hole is formed in the other side of the PDMA tank body, a storage hole channel for liquid to be measured is formed in the bottom of the PDMA tank body, and workelectrode ITO glass is fixed to the acrylic plate at the lower layer. According to the micro-electrolytic tank disclosed by the invention, the PDMS is utilized as an electrolyte solution carrier, theITO glass work electrode can effectively improve formaldehyde detection flexibility, effects of oxygen in air to electrochemical detection are reduced, and experiment accuracy is improved; by means of utilizing the acrylic plates as an external structure of the electrolytic tank, light transmission and impact resistance are effectively improved; meanwhile, cost of the electrolytic tank is reduced.

Description

technical field [0001] The invention belongs to the field of trace electrochemical analysis, in particular to the development of an electrochemical reaction micro-electrolytic cell based on a microfluidic chip. Background technique [0002] In the prior art, high performance liquid chromatography (HPLC), colorimetry / spectrophotometry, gas chromatography, fluorescence measurement, laser emission method, gas sensor method, nuclear magnetic resonance method, etc. are usually used for formaldehyde detection. However, these assays have the following disadvantages and limitations. For example: the detection speed is relatively slow and the sensitivity is low, the detection process is cumbersome, time-consuming, and the detection cost is high. For this reason, in recent years, electrochemical testing methods are being more and more applied to the detection of formaldehyde. The photoelectrochemical cell K020 (Shanghai Shishe Industrial Co., Ltd.) is made of quartz, and the four si...

Claims

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Application Information

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IPC IPC(8): G01N27/36G01N27/48G01N27/28
CPCG01N27/28G01N27/36G01N27/48
Inventor 孙晶曹猛徐亮季秋爽杨继红周瑶张丹丹许姣姣申贵隽
Owner DALIAN UNIVERSITY
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