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Formaldehyde sensor

A formaldehyde sensor, sensor technology, applied in instruments, scientific instruments, measuring devices, etc., can solve the problems of continuous measurement, complicated operation, low detection limit, etc. Effect

Inactive Publication Date: 2009-11-04
RAE SYST SHANGHAI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

It overcomes the difficulty of low resolution caused by too many interference factors when traditional electrochemical sensors detect low-concentration formaldehyde, and achieves a low detection limit, which can detect low concentrations of 10ppb. It also overcomes the complex operation and non-continuous operation of existing products in the market. Measurement Disadvantages

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Embodiment Construction

[0040] The basic design principles of the formaldehyde sensor of the present invention are as follows:

[0041] Like the traditional electrochemical sensor, the formaldehyde sensor of the present invention includes a working electrode, an auxiliary electrode and a reference electrode including electrolyte, necessary wires and gas diffusion holes. The sensor detects gas concentration through the principle of gas diffusion control. The difference is that the present invention adds a compensation electrode that is infinitely consistent with the characteristics of the working electrode inside the sensor. The compensation electrode is parallel to the working electrode and faces the side of the diffusion hole of the sensor together with the working electrode, that is, on the same working surface.

[0042] There are diffusion holes on the compensation electrode and the working electrode, but a compensation electrode filter layer that can selectively remove formaldehyde is added in fr...

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Abstract

The invention discloses an ultralow concentration electrochemical formaldehyde sensor which can detect low concentration of 10 ppb, and comprises at least a working electrode, a compensating electrode and a counter electrode, wherein the compensating electrode and the working electrode are positioned on the same working surface and isolated in different spaces, and the space where the compensating electrode is positioned comprises a compensating electrode filter layer for selectively removing formaldehyde. Provided with the parallel compensating electrode which is unlimitedly consistent with the working electrode in characteristic, the formaldehyde sensor eliminates the influence of interference gas and also eliminates a formaldehyde detection error caused by environmental temperature or humidity change, and thereby overcoming the difficulty of low resolving capability caused by too many interference factors when a traditional electrochemical sensor detects low concentration formaldehyde and having low detectability and high selectivity. The sensor also overcomes the defects of complicated operation and incapability of continuous measurement of existing products in markets.

Description

technical field [0001] The invention relates to the technical field of formaldehyde detection, in particular to a low-concentration formaldehyde sensor. Background technique [0002] Formaldehyde, also known as formaldehyde, is a volatile organic compound that is colorless and has a strong pungent odor. Its health hazards to the human body are manifested in stimulating the eyes and respiratory tract, causing abnormalities in the lung, liver and human immune function. In 1995, formaldehyde was identified as a suspected carcinogen by the International Agency for Research on Cancer (IARC). In 2004, formaldehyde was identified as the first class carcinogen by the International Agency for Research on Cancer (IARC). [0003] General: formaldehyde concentration in [0004] 0.01~3.1mg / m3, that is, 0.008~2ppm can cause headache, dizziness and insomnia; [0005] 0.06~0.07mg / m3, that is, 0.05~0.06ppm, children will have asthma; [0006] 0.12~1.2mg / m3, that is, 0.1~1ppm can cause ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/403
CPCG01N27/4045
Inventor 刘福霞谢雷周华方
Owner RAE SYST SHANGHAI
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