Acute toxicity of formaldehyde
Acute formaldehyde poisoning is manifested as irritation to skin and mucosa. Inhalation of high concentration formaldehyde can cause respiratory irritation, sneezing and coughing with burning sensation in nose and throat; In addition, it can also induce bronchial asthma, pneumonia and pulmonary edema. One-time intake of formaldehyde through digestive tract can cause symptoms of digestive tract and systemic poisoning, corrosion and burn of mouth, throat and digestive tract, abdominal pain, convulsion and death. Skin contact with formaldehyde can cause allergic dermatitis, pigmentation, skin necrosis and other diseases. Oral intake of 10~ 20ml formaldehyde solution can lead to death. ?
In animal experiments, the LD50 of formaldehyde ingested by rats is 800mg/kg, that absorbed by rabbits through skin is 2700mg/kg, and that inhaled by rats through respiratory tract is 590mg/m3. ?
Chronic toxicity of formaldehyde
Long-term exposure to formaldehyde can reduce respiratory function, information integration function of nervous system, affect the immune response of the body, and have toxic effects on cardiovascular system, endocrine system, digestive system, reproductive system and kidney. Systemic symptoms include headache, fatigue, loss of appetite, palpitation, insomnia, weight loss and autonomic nervous disorder. Animal experiments also confirmed the pathological changes of the above related systems. ?
Formaldehyde mutation
Formaldehyde can cause mutations in Salmonella typhimurium and Escherichia coli with or without metabolic activation system. The micronucleus rate of polychromatic erythrocytes in bone marrow increased significantly after continuous dynamic exposure to formaldehyde with concentrations of 0.5mg/m3, 1.0 mg/m3 and 3.0mg/m3 for 72 hours. ?
Carcinogenicity of formaldehyde
2017101On October 27th, the list of carcinogens published by the International Agency for Research on Cancer of the World Health Organization included formaldehyde in the list of carcinogens. ?
The research animals found that exposure of rats to formaldehyde 15 micrograms per cubic meter 1 1 month can lead to nasal cancer. The results of a new study released by the American Cancer Institute on May 12, 2009 show that chemical factory workers who are frequently exposed to formaldehyde are much more likely to die from cancers such as blood tumors and lymphoma than those who are less exposed to formaldehyde. 20 10 found that formaldehyde can cause nuclear gene mutation and chromosome damage in mammals. Formaldehyde has a combined effect with other polycyclic aromatic hydrocarbons such as benzopyrene, which will enhance toxicity.
Second, in addition to formaldehyde's method
1. Ventilation is actually the best way to effectively reduce indoor formaldehyde without spending money. Many popular science videos will talk about that more than two windows in the room are opened at the same time, and the circulating wind energy will take away more than 80% of formaldehyde in the air within a few months.
However, due to climatic conditions, some areas are in an environment with little or no wind, such as Chengdu Plain where our company is located. "According to the" Monthly Wind Direction, Wind Speed and Precipitation Climate Data of Chengdu "published on the website of Chengdu Meteorological Bureau, Chengdu belongs to the subtropical humid monsoon climate zone, and the most common wind direction in Chengdu is perennial static wind." Static wind means that there is no wind at level 0, and effective circulating wind cannot be generated indoors. Only circulating wind or headwind can effectively take away formaldehyde. In many houses or offices, the windows are opposite or open and closed, which is completely incompatible with ventilation conditions.
In addition, if a lot of non-solid wood boards are used in the decoration, ventilation alone is not enough. With the later life, formaldehyde will gradually spread and accumulate indoors.
2. If you are in a hurry to move in or the ventilation condition of your house is not very good, you can choose some in addition to formaldehyde products on the market or come to in addition to formaldehyde for service. As far as scientific and technological development is concerned, formaldehyde is no longer an uncontrollable substance. The catalysis of photocatalyst and biological enzyme can effectively and quickly reduce the formaldehyde content, and in addition to formaldehyde will not recur for a long time. However, you must be cautious when choosing in addition to formaldehyde products or visiting in addition to formaldehyde service companies. For formaldehyde products or in addition to formaldehyde door-to-door service agencies, we suggest that you compare them from the following aspects:
(1) Don't blindly choose products because of the factors of product spokespersons, such as online celebrities bringing goods or celebrity endorsements;
Celebrity endorsement does not mean that its products are qualified.
(2) Don't blindly follow the brand size of in addition to formaldehyde products or the door-to-door aldehyde removal service company;
Brand size and popularity only represent its popularity and cannot determine its service quality.
(3) Whether aldehyde-removing products have all national testing qualifications is the guarantee of family safety;
For example, the in addition to formaldehyde rate report of the National Quality Supervision and Inspection Center.
In addition to formaldehyde rate report of microbial analysis and testing center
Report of the Center for Disease Control and Prevention on the toxicity test of its products.
Non-corrosive test report of furniture and leather products
ISO900 1 international quality system certification
И o14001environmental management system certification
Not all of them are needed, but the more tests, the better.
(4) Whether the service technician has the construction qualification is the guarantee of the governance effect;
Such as: China indoor environment purification and monitoring service enterprise qualification certificate.
China Indoor Environmental Purification Industry Capability Grade Certificate
Construction qualification certificate of indoor environment purification and treatment industry
Certificate of indoor environment administrator
Not all of them are needed, which varies from province to province, but the more the better.
(5) Whether aldehyde removal products will react with formaldehyde or other household substances to produce secondary pollution;
(6) Whether there is a true and qualified test report after aldehyde removal is the guarantee of life safety.
Summing up a few conditions, you can screen out more suitable in addition to formaldehyde products or visit in addition to formaldehyde institutions.