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Method for detecting formaldehyde content in air with high accuracy

A technology of formaldehyde content and detection method, which is applied in the measurement of color/spectral characteristics, material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problem of low accuracy of results and formaldehyde detection. The method is time-consuming and labor-intensive, so as to achieve the effect of accurate test results and time-saving testing.

Inactive Publication Date: 2019-02-19
河南大瑞物联网科技有限公司
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Problems solved by technology

[0002] The existing formaldehyde detection methods are time-consuming and laborious, and the accuracy of the results is low

Method used

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Embodiment Construction

[0007] A method for detecting air formaldehyde content with high accuracy, comprising the following steps: 1) collecting atmospheric samples using a sensor and a sampler; 2) continuously extracting the sample using a gas pipette with acetone as an extraction solvent; 3) using activated carbon as a purification adsorbent Canning, pre-rinse the adsorbent with clean water after filling the can; 4) Put the extract in step (2) into the can and use it, concentrate the eluent to 3-5mL, and place it in an environment of minus 6-8 degrees 5) adding activated styrene-based cation exchange resin for ion exchange treatment; 6) adding an appropriate amount of ammonium ferric sulfate solution after filtration, shaking and fully mixing; 7) comparing the sample to Put the color bottle into the colorimetric tank of the formaldehyde analyzer, and lock it with the positioning cover of the colorimetric tank, and start the instrument to get the display value of the formaldehyde concentration in the...

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Abstract

The invention discloses a method for detecting the formaldehyde content in air with high accuracy. The method comprises the following steps of: collecting an atmospheric sample by using a sensor and asampler; continuously extracting the sample by using a gas absorbing pipe and using acetone as an extraction solvent; performing canning by using activated carbon as a purifying adsorbent, and pre-leaching the adsorbent with clean water after canning; canning the extraction liquid in the step (2) and concentrating the extraction liquid to 3-6-8 mL by using an eluent, and then placing the solutionin an environment of minus 6-8 degrees in the dark for 3-4 hours. The method for detecting the formaldehyde content in air with high accuracy is a colorimetric analysis method based on the selectiveabsorption and coloration for visible light by a colored compound formed by reacting formaldehyde with a color developing agent in a tested sample. According to the method for detecting the formaldehyde content in air with high accuracy, an accurate formaldehyde concentration value can be directly obtained by converting and comparing with a preset chemical standard curve, and correcting the influence of the temperature, humidity, and pressure of the air.

Description

technical field [0001] The invention relates to a detection method, in particular to a high-precision detection method for air formaldehyde content, which belongs to the field of environmental safety detection. Background technique [0002] The existing formaldehyde detection methods are time-consuming and laborious, and the accuracy of the results is low. Contents of the invention [0003] Aiming at the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a method for detecting formaldehyde content in the air with high precision, which can quickly and accurately detect the formaldehyde content in the air on site, with high accuracy and reliability of the results , the test time is short, the test method is simple, and the cost is low, and the operation is safe. [0004] In order to solve the above-mentioned technical problems, the technical solution adopted by the present invention is a method for detecting air formalde...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N21/31
CPCG01N21/78G01N21/31
Inventor 韩金花
Owner 河南大瑞物联网科技有限公司
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