Charging characteristics of smoke due to high temperature chemical ionization, cigarette smoke is a micro-charged aerosol, in which about 1/3 of the particles are positively charged, 1/3 of the particles are negatively charged, and the other 1/3 are Neutral particles, the number of positive and negative charges are equal. Therefore, as a whole, the flue gas is electrically neutral. Acidity and alkalinity of flue gas Due to different combustion methods, the mainstream smoke and sidestream smoke have different acidity and alkalinity. Generally speaking, the sidestream smoke produced by smoldering is basically alkaline Cigarettes For Sale, and the mainstream smoke produced by smoking is different from tobacco raw materials. Some of them are acidic, some are alkaline, and some are neutral. Mainly due to different raw materials, the amount of alkaline components and acidic components produced are also different. For various types of cigarettes, the mainstream smoke has a pH value of 5. 6 to 6. 5, while the mainstream cigarette smoke has a pH value of 7. 5 to 10. 0. The dynamic nature of flue gas cigarette smoke is not stable, because the concentration of flue gas is very high, the particles in it will quickly agglomerate in a short time, the number of particles in the new flue gas will fall to its initial value within four seconds One in one. Due to agglomeration, flue gas particles increase rapidly. In addition to the rapid changes in the physical properties of flue gas, the concentration of compounds in flue gas also changes. For example, methyl nitrite in mainstream flue gas is actually in the new flue gas. It only appeared after 10 seconds. Composition of flue gas Cigarette flue gas is composed of gas-phase material and granular material. Gaseous and particulate matter in flue gas usually pass through Cambridge filters at room temperature (a filter made of glass fiber, which can filter out particles with a diameter greater than 0. 2μm, and the filtration efficiency can reach 99%) The part of the flue gas is called gas phase material. Gaseous substances account for about 92% of the total flue gas, including air (about 58%), excess nitrogen (about 15%) mokingusacigarettes.com, hydrocarbons, organic vapors, nitrogen oxides, and some biologically active substances. The part that can be intercepted by the Cambridge filter is called particulate matter. The particulate matter accounts for less than 8% of the total flue gas, mainly water, nicotine and tar. Of course, this is not a definition that can be clearly divided, because some components are found in the gas phase and granular phase, and different separation techniques have different conclusions, such as water, nitrosamines, etc. Are there. Tar in the smoke The remaining part of the cigarette smoke particulate phase except for water and nicotine is called tar. Tar is produced by incomplete combustion of organic matter in cigarette tobacco under anoxic conditions. It is a complex compound composed of a variety of hydrocarbons and hydrocarbon oxides, sulfides and nitrides. At present, it is generally believed that harmful components in cigarette smoke are mainly concentrated in tar. According to reports, 99. 4% of the components in cigarette tar are harmless to the human body (among them some low volatile components are the source of cigarette flavor) Marlboro Cigarettes, only 0. 6% of the components are harmful to human health, and these harmful components Among them, 0. 2% of the components are cancer-causing and possible carcinogenic components, and 0. 4% are auxiliary carcinogenic components, such as 3, 4-benzo[a]pyrene and other fused ring aromatic hydrocarbons, aromatic amines and nitrosamines. Semi-volatile components in flue gas In addition to the particulate phase and gas phase components, there is a so-called semi-volatile component that is often mentioned. Semi-volatile components usually refer to substances that can remain on the Cambridge filter at room temperature, but can evaporate from the filter without decomposition at a certain temperature (generally between 100°C and 200°C). In a nutshell, semi-volatile substances are composed of about 300 substances with boiling points in the range of 70°C to 300°C, and they include most of the ingredients that contribute to smoke inhalation and aroma.
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