The content of free silica is an important part of the determination of dust pollutants in the air. In this paper, the standard curve method is used to determine the content of silica. The method is simple and the recovery rate is ideal. In the coal mine, gold mine and other ore collection industry, ceramic processing and refractory industry and other work sites, and the air around the thermal power plant contains more free silica. Long-term exposure to this type of air can damage people's respiratory system and can seriously cause silicosis, so it is particularly important to control and monitor the amount of free silica in the air. The main component of free silica in the air is α-quartz. This article refers to “GBZ / T 192.4-2007 Determination of Dust in the Air of Workplaces-Part IV: Free Silica Content†and selects the standard curve method to determine the silica content of the sample. Simple and accurate results. Backpacks,Rucksack,Jansport Backpack,Mini Backpack Ningbo Happiness Stationery Industrial & Trading Co Ltd , https://www.nbcnhappiness.com