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

A technology of maximum absorption wavelength and spectrophotometry, which is applied in the field of chemical detection, can solve problems such as inaccurate measurement results, and achieve the effects of ensuring accuracy, convenient operation, and simple steps

Inactive Publication Date: 2012-06-20
苏州华碧微科检测技术有限公司
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Problems solved by technology

[0006] In order to solve the problem that there are multiple colorimetric wavelengths in the existing formaldehyde detect

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

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Embodiment Construction

[0015] The preferred embodiments of the present invention are described in detail below, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0016] A method for selecting the maximum absorption wavelength when acetylacetone spectrophotometry detects formaldehyde, the method comprises the following steps:

[0017] A. Take 3.8mL formaldehyde solution with a concentration of 37%, dilute it with distilled water, and prepare it as a 1500ug / mL formaldehyde standard solution;

[0018] B, use the 1500ug / mL formaldehyde standard solution that step A obtains to prepare the formaldehyde test solution that concentration is 0ug / mL, 15ug / mL, 30ug / mL, 100ug / mL respectively in the volumetric flask of 500mL;

[0019] C. Use a single-standard pipette to take 5mL of the four kinds of formaldehyde to be tested into the test tube, and add 5mL o...

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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...

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Application Information

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IPC IPC(8): G01N21/31
Inventor 孙道元
Owner 苏州华碧微科检测技术有限公司
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