- the chief culprit in the haze that endangers human health Pre-review As can be seen from our first article, the general anti-fog mask is composed of three layers of non-woven fabric - electrostatic filter cotton - non-woven fabric, and the micro-morphology of each layer is quite different. Therefore, the author guesses: In the process of filtering smog, is the effect of each layer of the mask different? Preface The theme of this issue is to unveil the smog and explore the culprits that endanger human health in smog. Scanning electron microscopy of Zeiss's Sigma-500 model and Bruker's electric refrigeration ultra-fast analysis of the X-Flash 6-30 [Elemental Surface Distribution Function], the smog particles on different layers in the mask after use were carried out. Ingredient analysis, to see if the different layers of the mask filter smog particles are different, in order to help everyone understand the role of each layer of PM2.5 mask. First, artificial suction device - dedicated to microscopic technology This issue is our OPTON cute SEM application engineer wearing a mask in the smog weather "to try the law", wearing an anti-fog mask in the fog for an hour to carry out "sample preparation", want to see our usual life What are the smog particles inhaled in the end? Top left: A week's walking route map around the lake; Bottom left: Live shots during the sampling process Right: 3M9501 mask after use From the above picture, we can see that in such a severe smog weather, the outer layer of the mask changed from white to gray after one hour of activity. Imagine if you don't wear a mask, these particles will be directly sucked into the body, which seriously endangers people's health. I. Analysis of smog particle composition on different mask filter layers Outer layer nonwoven Elemental distribution of the outer nonwoven fabric of the used PM2.5 mask The used outer nonwoven fabric has various shapes of particles, the size of the large particles is nearly 5 um, and the size of the small particles is less than 1 um. This shows that the outer nonwoven fabric can block a certain amount of smog particles in addition to blocking large dust particles in the air. The results of the energy spectrum analysis showed that the main elements of the particles adsorbed on the outer nonwoven fabric were Si, O, Fe, Al, C, Ca, Ti, K, and Mg. It is inferred from the elemental analysis of the surface distribution that these particles may be silicate minerals, silicon/aluminum oxides, ferric oxide heavy metal compounds. 2. Outer electrostatic filter cotton Elemental distribution of the outer electrostatic filter cotton of the used PM2.5 mask The used outer electrostatic filter cotton has a large amount of finely distributed fine particles, which shows that the outer layer of electrostatic filter cotton plays a good role in blocking the smog particles. Through the analysis of BRUKER spectrum, the results of energy spectrum analysis showed that the main elements of the particles adsorbed on the outer electrostatic filter cotton were Fe, S and O. It is inferred by elemental analysis of the surface distribution that these particles may be iron sulfate, sulfide and ferrite heavy metal compounds. 3. Inner layer electrostatic filter cotton Elemental distribution of the outer electrostatic filter cotton of the used PM2.5 mask The used inner layer of electrostatic filter cotton has a much smaller amount of particulate matter than the outer layer of electrostatic filter cotton. It shows that the whole electrostatic filter cotton plays a very good role in blocking the smog particles. The results of energy spectrum analysis showed that the main elements of the particles adsorbed on the inner layer of electrostatic filter cotton were Si, O, S, Fe and the like. These particles may be aluminum silicon compounds, sulfides, heavy metal compounds, and the like. 4. Inner layer non-woven fabric Elemental distribution of the inner nonwoven fabric of the used PM2.5 mask It has been found that the particles on the inner layer of the nonwoven fabric have been found to be substantially difficult to find, with only a small portion of the particles present. The results of energy spectrum analysis showed that the main elements of the particles adsorbed on the inner layer of electrostatic filter cotton were Si, O, S, Al and other elements. Compared with the previous test results, we found that the mask is mainly composed of light element oxides such as silicon and aluminum, and the oxide of heavy metal elements is gone. First, postscript By qualitative analysis of the particle physicochemical synthesis by means of elemental surface distribution, we can find that the masks for filtering smog are mainly silicate light element compounds and iron-containing heavy metal oxides. The outer non-woven fabric blocks a large number of large-sized particles, and the inner layer of electrostatic filter cotton absorbs almost all of the charged particles, and the last layer of non-woven fabric also blocks the missing uncharged small particles. At the same time, the author reminds: If the mask is not worn in the fog, these particles will be inhaled into our body during normal breathing, which will bring great harm to our health. Therefore, it is recommended that you minimize the chance of going out during the winter smog, and wear a mask that is resistant to PM2.5 even if you go out to ensure your health. Choose one of the next topics: A. The specific composition and content of airborne particles in the haze. B. Morphology and compound composition of dust in the air. C, new topic - use the microscope to decrypt the "mystery of wealth." About Ou Botong Ou Bo Tong Co., Ltd. is a leading micro-nano technology service provider in China. It is a high-tech enterprise with foreign investment as its investment background. It is headquartered in the UK and is located in Beijing, Shanghai, Liaoning, Shandong, Henan and Shaanxi. There are branches and offices. As the most important strategic partner of Zeiss Electron Microscope in China, the company adheres to the business philosophy of “Building the most influential instrument sales brand in China†and is a strong alliance with the Zeiss brand. It is providing high quality for tens of thousands of Chinese users. Products with international cutting-edge technology services. In the future, we will continue to be committed to the innovation and development of China's micro-nano technology, and work together with our customers to paint a broad blueprint for the revitalization of China's high-end micro-nano technology! Chamomile Oil,Pure Essential Oil Set,Orange Oil,Pure Spearmint Oil Ji'An ZhongXiang Natural Plants Co.,Ltd. , https://www.zxnaturaloils.com
