Method for selecting maximum absorption wavelength in detecting formaldehyde with acetylacetone spectrophotometry

Abstract

The invention provides a method for selecting a maximum absorption wavelength in detecting formaldehyde with an acetylacetone spectrophotometry. The method comprises the following steps of: A, preparing a certain concentration of standard formaldehyde solution; B, using the standard solution to respectively prepare several different concentrations of formaldehyde solutions to be detected; C, respectively taking appropriate amount of formaldehyde solutions to be detected to test tubes, and respectively adding appropriate amount of acetylacetone solutions; D, respectively using 10mm of absorption cells to detect the absorbance As of several different concentrations of formaldehyde solutions to be detected at several different wavelengths of a spectrophotometer; E, using appropriate amount of distilled water and isometric acetylacetone for blank control, and respectively using the10mm of absorption cells to detect the absorbance A0 at several different wavelengths of the spectrophotometer; and F, respectively calculating the absorbance A of several formaldehyde solutions to be detected under different wavelengths, and determining the maximum absorption wavelength. The method has simple steps and convenience for operation, the maximum absorption wavelength is effectively found out, and therefore the accuracy of formaldehyde content detected by the acetylacetone spectrophotometry is ensured.

Description

technical field [0001] The invention relates to the field of chemical detection, in particular to a method for detecting formaldehyde by acetylacetone spectrophotometry. [0002] Background technique [0003] Formaldehyde is a colorless gas with a strong and special pungent smell. As a carcinogen, it is the key control object of many regulations. If people live in a room polluted by formaldehyde for a long time, it can cause diseases such as decreased immunity, infertility or fetal malformation, respiratory diseases, mental depression, leukemia and cancer. [0004] There are usually three sources of formaldehyde in life: 1. Formaldehyde in the air mainly comes from industrial production, plastic parts, rubber products, urea-formaldehyde foam, automobile exhaust, etc.; 2. Indoor formaldehyde mainly comes from decorative materials, such as wood and adhesives 3. Formaldehyde can also come from cosmetics, preservatives, printing inks, paper, textile fibers, etc. For the detec...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that there are multiple colorimetric wavelengths in the existing formaldehyde detection method, resulting in inaccurate measurement results, the present invention proposes the following technical solutions:

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