With the improvement of people's quality of life, the quality of indoor environment has gradually attracted widespread attention. Formaldehyde, as the main pollutant in interior decoration and furniture, poses a potential threat to human health. Therefore, understanding formaldehyde detection methods and standards is essential to ensure the safety of the living environment. This article will introduce in detail the common methods, technical principles and national standards of formaldehyde detection.
Formaldehyde detection methods.
1.Phenol reagent spectrophotometry.
Phenol reagent spectrophotometry is a commonly used formaldehyde detection method. Its principle is to use phenolic reagent to react with formaldehyde to generate throat, and then add specific chemical agents to carry out color reaction, and determine the formaldehyde concentration by colorimetry. This method is easy to operate and has high accuracy. It is suitable for the quantitative detection of indoor formaldehyde.
2.Gas chromatographyGas chromatography is a formaldehyde detection method based on chromatographic separation technology. By adsorbing formaldehyde in the air on a support coated with polymer porous spheres, the formaldehyde is released by the principle of thermal analysis and entered the chromatographic column for separation. The advantages of this method are high accuracy and strong anti-interference ability, and it is suitable for formaldehyde detection in complex environments.
3.Sensor method.
The sensor method is a method that uses sensor technology for formaldehyde detection. There are many formaldehyde sensors on the market to choose from, such as electrochemical sensors, optical sensors, etc. These sensors can monitor formaldehyde concentration in real time and output electrical signals, which are easy to operate and suitable for formaldehyde monitoring in homes and offices.
In China, the detection and limit standards of indoor formaldehyde mainly refer to the "Indoor Air Quality Standard" (GB T 18883-2002). The standard stipulates that the concentration of formaldehyde in the room shall not exceed 01 milligram (0..)1mg/m3)。It should be noted that the standard is a guiding standard, and comprehensive factors such as the release of interior decoration materials and furniture and environmental factors need to be considered in the actual implementation.
IV. Conclusions. Formaldehyde detection is an important means to ensure the quality of indoor environment. In this paper, the commonly used formaldehyde detection methods such as phenolic reagent spectrophotometry, gas chromatography and sensor method are introduced, as well as the restrictions on formaldehyde concentration in China's current "Indoor Air Quality Standards". In practical applications, appropriate detection methods and standards should be selected according to specific needs and conditions to ensure the health and safety of the living environment.
With the development of science and technology, formaldehyde detection technology is also constantly improving. In the future, we look forward to more accurate and convenient formaldehyde detection methods to be applied in real life to create a healthy and safe living environment for people. At the same time, it is also necessary to raise the public's attention to the quality of the indoor environment, enhance environmental awareness, and jointly maintain our quality of life.