Formaldehyde hazard prevention and control
Toxicological data of formaldehyde
The main harm of formaldehyde is its irritating effect on skin and mucous membrane. When formaldehyde reaches a certain concentration indoors, people will feel uncomfortable. Formaldehyde concentration greater than 0.08 mg / M? Can cause redness of eyes, itching of eyes, discomfort or pain of throat, hoarseness of voice, sneezing, chest tightness, asthma, dermatitis, etc. The formaldehyde content in newly decorated rooms is high, which is the main cause of many diseases.
LD ₅: 800mg / kg (rat oral), 2700mg / kg (rabbit skin); LC ₅: 590mg / m3 (rat inhalation).
Inhalation of 60-120mg / M 3 caused bronchitis and severe lung damage.
People inhaled 12-24mg / M ~ 3, nose and pharyngeal mucosa were severely burned, shed tears and coughed; people inhaled 10-20ml, and died.
High formaldehyde concentration can cause acute poisoning, which is manifested as sore throat, dyspnea, pulmonary edema, Henoch Schonlein purpura, allergic dermatitis, elevated liver transaminase, jaundice, etc.
Subacute and chronic toxicity:
After inhalation of 50-70mg / M 3, 1 hour / day, 3 days / week and 35 weeks, proliferation and biochemical changes of basal cells of trachea and bronchus were found; 
Long term inhalation of 20-70mg / M 3 will cause loss of appetite, weight loss, weakness, headache and insomnia; 
Long term inhalation of 12mg / M 3 will cause drowsiness, weakness, headache, tremor of fingers, and vision loss. 
Formaldehyde has pungent smell, which can be smelled at low concentration. The olfactory threshold of human to formaldehyde is usually 0.06-0.07mg/m3. However, there are great individual differences, some of them can reach 2.66mg/m3. Long term and low concentration exposure to formaldehyde will cause headache, dizziness, fatigue, sensory impairment, immunity reduction, drowsiness, memory loss or neurasthenia, mental depression; chronic poisoning is also a great harm to the respiratory system, long-term exposure to formaldehyde can cause respiratory dysfunction and liver toxic lesions, manifested as liver cell damage, abnormal liver radiation energy, etc.