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Method for detecting formaldehyde in indoor air by using acetylacetone spectrophotometric method

A spectrophotometry, acetylacetone technology, applied in the direction of color/spectral property measurement, etc., can solve the problem of high harm of formaldehyde, and achieve the effect of good reproducibility, simple method and fast color development.

Inactive Publication Date: 2014-02-19
SUZHOU GUOHUAN ENVIRONMENT DETECTION
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  • Abstract
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Problems solved by technology

Due to the great harm of formaldehyde, the determination of indoor formaldehyde content is a must-test content for indoor environmental testing, but there is currently no method with high accuracy

Method used

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Embodiment Construction

[0017] The present invention is described in further detail now in conjunction with embodiment.

[0018] A method for measuring formaldehyde in indoor air by acetylacetone spectrophotometry, comprising the following steps:

[0019] (1) Take a bubble absorption tube with 10ml of distilled water inside, connect it to an air sampler, and collect gas for 20 minutes at a speed of 0.5L / min. At this time, the collected indoor air to be measured is 10L, and the formaldehyde reserve is prepared by the iodometric method. Solution, the concentration of the configured formaldehyde stock solution is 1mg / ml.

[0020] (2) Preparation of acetylacetone solution. The specific operation is to weigh 25g of ammonium acetate, add a small amount of water to dissolve, add 3ml of glacial acetic acid and 0.25ml of freshly distilled acetylacetone, mix well and then add water to 100ml, adjust the pH=6.0, the concentration of this solution is 2mg / l, at 2°C Store at -5°C.

[0021] (3) Dilute the 1mg / ml ...

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Abstract

The invention relates to a method for detecting formaldehyde in indoor air by using an acetylacetone spectrophotometric method. The method comprises the following steps of (1) collecting indoor air to be detected, and preparing a formaldehyde stock solution; (2) preparing an acetylacetone solution; (3) diluting the formaldehyde stock solution, then, transferring the diluted formaldehyde stock solution into an evaporation pan, and next, placing the evaporation pan into a seal box; (4) subjecting formaldehyde with different volumes in the seal box and the acetylacetone solution to reaction, and meanwhile, detecting the absorbancy; (5) carrying out blank control, and detecting the absorbancy. The method disclosed by the invention is simple, rapid in color development, few in interference factor, easy to operate, good in repeatability and high in detecting accuracy.

Description

technical field [0001] The invention relates to a method for measuring formaldehyde, in particular to a method for measuring formaldehyde in indoor air by acetylacetone spectrophotometry. Background technique [0002] Formaldehyde is a colorless gas with a strong pungent smell. It is highly toxic, mainly cytoplasmic poison, and has a strong effect of destroying cell proteins. After entering the human body, formaldehyde can coagulate and denature proteins. Dizziness, vomiting, abdominal pain, diarrhea, etc. will occur, and the most serious ones will cause liver cancer, nasopharyngeal cancer, gastric cancer, etc. Long-term inhalation by pregnant women may cause birth defects and even death. [0003] Formaldehyde generally comes from the following ways: 1. Formaldehyde in the air mainly comes from industrial production, plastic parts, rubber products, automobile exhaust, etc.; 2. Indoor formaldehyde mainly exists in plywood, fiberboard, particleboard and other artificial materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 徐晓华
Owner SUZHOU GUOHUAN ENVIRONMENT DETECTION
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