Formaldehyde poisoning symptoms Formaldehyde is a colorless but has a strong pungent smell of gas, formaldehyde is the most taboo when people decorate rooms and buy cars, especially in the purchase of paint and car accessories will pay special attention to whether it is environmentally friendly, whether it contains excessive formaldehyde and so on. Formaldehyde poisoning symptoms are: mild poisoning, moderate poisoning, severe poisoning. The symptoms of mild poisoning are congestive eye conjunctiva, redness and swelling, dyspnea, heavy breathing, hoarse throat, speech or dry dull dull or wet; The symptoms of moderate poisoning were persistent cough, phlegm, chest tightness, dyspnea and dry and wet breaking sound. The symptoms of severe poisoning are deterioration of the lungs and larynx with pulmonary edema and fourth degree laryngeal edema. Formaldehyde is a colorless gas that is not easy to be noticed, but it is very harmful to the human body and can stimulate the skin. The main harm of formaldehyde is the stimulation of the skin and mucous membranes. Formaldehyde is a protoplasmic toxic substance that can combine with protein and cause severe respiratory tract irritation and edema, eye irritation and headache when inhaled in high concentration. It is allergenic to human body. Direct skin contact with formaldehyde may cause atopic dermatitis, stains and skin necrosis. The harm of formaldehyde can also cause headache, fatigue, nausea, vomiting, chest tightness, palpitations and so on.
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Ventilation method Ventilation method does not have to be too explained, that is, through the flow of air, the harmful gases are discharged to the outside, which is a simple and effective method, the only deficiency is that the formaldehyde release cycle is long, generally three to fifteen years, after the renovation of the new house idle for more than three years is obviously unrealistic. The ventilation method alone does not meet the requirements. Pros: A cost-free approach to governance. Disadvantages: Due to the different conditions of environmental treatment, formaldehyde pollution can not be completely solved. And the car can not achieve a long window ventilation conditions.
Physical adsorption method compared with traditional activated carbon, nano living ore on the one hand does not contain harmful substances, on the other hand can absorb other decoration materials, such as paint, furniture, floor released harmful gases. The national Code for Indoor Environmental Pollution Control of Civil Construction Projects lists five major pollutants: formaldehyde, benzene, ammonia, volatile organic compounds (TVOC) and radioactive radon. Experts pointed out that the best way to control indoor formaldehyde pollution is to use nano-active ore and open Windows for ventilation.
Formaldehyde scavengers or formaldehydase formaldehyde scavengers rely on chemical reaction methods to "remove" formaldehyde, the essence of this method is to reduce the toxicity of the target substance or convert to non-toxic substances. Formaldehyde, can be oxidized to formic acid, can also be reduced to methanol, the toxicity and irritation of these two substances is lower than formaldehyde, but their toxicity still exists. For example, some strong oxidizing formaldehyde scavengers can oxidize formaldehyde, but it is easy to decompose, spray on the board will damage the wood, and lose effectiveness within a few hours, it is impossible to achieve "one spray forever." Moreover, high concentration of scavengers sprayed in the air will cause new pollution hazards to people. Other oxidants and reducing agents can not effectively remove formaldehyde, and will introduce similar new pollution. Advantages: Free formaldehyde can be solved instantly in a short time. Disadvantages: Containing chemical composition titanium dioxide, easy to cause secondary pollution of chlorine dioxide.
Nankai University specializing in activated carbon adsorption teacher Li told reporters that the early use of activated carbon does have an effect, because the pores have adsorption potential, is formed by the gravity of carbon molecules and adsorbed molecules, the smaller the aperture, the stronger the adsorption potential. In addition, according to the theory of molecular motion, all objects are composed of molecules or atoms, there are gaps between them, and at the same time, they are in a state of never-ending random thermal motion, and the molecules collide with each other very frequently. According to the relevant data, in the standard state, the free motion speed of formaldehyde molecules is about 450 meters/second, and a formaldehyde molecule collides with other molecules 109 times per second. At this time, if the diameter of the collision molecule matches the activated carbon pore, it is adsorbed. Whether it is the traditional activated carbon or the modified activated carbon that is fried more, the adsorption capacity is limited due to its large pores. The maximum temperature of the sun is only about 50 degrees Celsius, which can only evaporate water and so on. The pollutants adsorbed in activated carbon can not be completely volatilized, and the adsorption function of carbon can not be completely restored. So exposure is more about removing water from activated carbon. Can not recover its adsorption properties. Activated carbon generally has a certain adsorption effect on benzene, and the adsorption effect on formaldehyde is not obvious, and the adsorption capacity of activated carbon will become weak after a month. Pros: Cheap. Disadvantages: The adsorption effect is too weak
Water, vinegar, black tea soak water to remove formaldehyde Many people on the Internet said that because formaldehyde is soluble in water, you can put a few more basins at home to absorb formaldehyde, or use vinegar or black tea soak water and other methods. It is a fact that formaldehyde is soluble in water, water, alcohol and ether, and the free formaldehyde in the air will dissolve into it after encountering water during the movement, which is similar to the adsorption principle of activated carbon. The contact area between a basin of water and air is only the size of the basin, and the specific surface area of the internal pores of 1 gram of activated carbon can reach as large as a football field. Even if you put a hundred POTS of water in the room, the adsorption effect is not much stronger than a small package of activated carbon. Therefore, it is obviously unrealistic to use water, black tea, vinegar and other methods to adsorb formaldehyde. The release of formaldehyde is closely related to the temperature and temperature of the room, and the increase of humidity in the air will greatly increase the release of formaldehyde. The experimental results show that when the relative temperature in the air increases by 10%, the indoor formaldehyde emission will increase by about 5%. Pros: Use some of life again. Disadvantages: The effect is not obvious.
Oranges, pineapples and other fruits adsorption formaldehyde This is a method that many people like to use in the past, can be said to be a folk soil method. Many folk soil methods are the summary of long-term life experience, which is the truth tested by time and practice. But this is a completely absurd approach. CCTV Financial channel "Is It True?" Column just broadcast a program, grapefruit peel, pineapple to remove formaldehyde? Is it true? The experiment was specially done in the program, and the experimental results showed that in the same sealed bin, the formaldehyde content of the experimental bin with pomelo peel was ten times that of the blank bin. Because after the grapefruit peel is put in, the temperature of the experiment chamber increases, and the amount of formaldehyde released greatly increases. Grapefruit peel, pineapple, etc., not only can not remove formaldehyde, but also increase the formaldehyde content in the room. In the past, many people felt that after the use of grapefruit peel and pineapple, the indoor decoration taste was small, because the taste of fruit covered up the taste of formaldehyde. Advantages: It can mask other odors with fruit aroma. Disadvantages: Can not play the role of adsorption of formaldehyde.
The principle of air agent is the same as that of grapefruit peel, pineapple, etc., but it covers up the taste of harmful gases with a smell, and can not have any removal effect at all. And the air agent itself is also a chemical, and it will be harmful to health. Advantages: Spraying air conditioner can make the room smell pleasant. Disadvantages: The chemical composition of ether causes great harm to the human body.
Plants can inhale some harmful substances through photosynthesis, but the effect of such methods is extremely limited. The reasons are as follows: 1) plants carry out photosynthesis, generally inhaling some harmful substances during the day, and do not have this function at night. The law of human life is generally outdoor during the day and indoor at night, when people most need air purification, plants have no way to play a corresponding role. 2) The harmful substances absorbed by plants are extremely limited. The national standard for formaldehyde release value requirements of less than 0.08 mg/cubic meter, the vast majority of just decorated houses, formaldehyde is not less than 0.2 mg/cubic meter, and the absorption of formaldehyde efficiency is higher green flowers, the absorption of formaldehyde per hour is only 20 micrograms. In terms of a 100 square meters, room height of 3 meters, formaldehyde value of 0.2 mg/cubic meter room, at the same time need 1800 POTS of green plants, almost to fill the entire house space, in order to reduce formaldehyde to 0.08 mg, which is still in the case of sufficient light during the day, and to ensure that there is no longer formaldehyde release in the process of absorption. In fact, formaldehyde is still being released in the furniture after decoration. Therefore, plants can only play an auxiliary role in the treatment of harmful substances such as formaldehyde and benzene. Advantages: Combined with photosynthesis to produce oxygen ion air. Disadvantages: There is no UV exposure and the amount of plant cultivation hardly sees the effect.
All the purification efficiency calculations of the air purifier are completed in the laboratory, and are measured in the absence of persistent pollution sources, that is, these data are obtained under specific conditions, so in actual use, the purification efficiency will be lower than the business claims. In essence, the air purifier only plays a supplementary and remedial role, in the case of indoor air pollution, the use of air purifier can reduce the degree of pollution to a certain extent, but it does not mean that it can fundamentally eliminate air pollution. Advantages: It can purify PM2.5 in the air. Disadvantages: It is expensive and can not achieve the function of decomposing gases such as formaldehyde and benzene.
It is difficult to remove harmful gases after decoration by one method alone, and it is best to choose several methods combined with the actual situation.
In the decoration process, as far as possible to choose environmentally friendly materials, so as to prepare for a rainy day.