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[Chemical Knowledge]：Detection Method and Analysis Technology of Paraformaldehyde

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Paraformaldehyde (Polyoxymethylene, referred to as POM) is an important synthetic polymer material, with excellent physical and chemical properties, in the automotive, electronics, medical equipment and other fields have a wide range of applications. POM may release free formaldehyde during processing, which poses potential risks to human health and the environment. Therefore, it is essential to understand the content of free formaldehyde in POM and take effective control and monitoring measures.

At present, the commonly used detection methods of paraformaldehyde include gas chromatography (GC), high performance liquid chromatography (HPLC), infrared spectroscopy (IR), mass spectrometry (MS) and so on. Among them, gas chromatography is a commonly used analytical method, and the free formaldehyde in the sample is separated and quantitatively analyzed by gas chromatography. High performance liquid chromatography is a rapid and accurate method for the quantitative analysis of free formaldehyde in paraformaldehyde. The infrared spectrum law is to determine the formaldehyde content by analyzing the absorption of the sample under infrared light, which has the advantages of fast and no damage. The mass spectrometry method is to analyze the sample by mass spectrometer, which can accurately determine the content of free formaldehyde in the sample.

In addition to the above methods, paraformaldehyde can also be detected and analyzed by chemical analysis methods. Chemical analysis methods mainly include differential scanning heat method (DSC), thermal reanalysis (TGA), nuclear magnetic resonance spectroscopy (NMR) and so on. Differential scanning calorimetry is a method of analyzing the properties of a sample by measuring the heat released or absorbed by the sample during heating or cooling, and can be used to analyze the content of free formaldehyde in paraformaldehyde. Thermogravimetric analysis is a method to analyze the properties of samples by measuring the mass changes of samples at different temperatures, and is suitable for the detection of free formaldehyde in paraformaldehyde. The method of nuclear magnetic resonance spectroscopy is to determine the formaldehyde content in the sample by measuring the nuclear magnetic resonance signal of the sample in the nuclear magnetic resonance spectrometer, which has the advantages of high sensitivity and high resolution.

Understanding the detection methods and analytical techniques of paraformaldehyde is of great significance for controlling and monitoring the content of free formaldehyde in paraformaldehyde. Various methods have their own advantages and disadvantages, and appropriate methods can be selected for testing and analysis according to actual needs to ensure product quality and human health.

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