what's Formaldehyde

[chenhongxia]

Formaldehyde (chemical formula HCHO, Weight: 30.03, is a colorless, have a strong irritating smell of gas. Soluble in water, alcohol ether. Formaldehyde is gaseous at room temperature, usually in the form of aqueous solution. 40 percent of its aqueous solution Known as formalin, the solution boiling point of 19 ℃. So easily at room temperature, evaporation, volatile as the temperature rose faster.

Formaldehyde higher toxic material in the country's control of toxic chemicals on the list of priority ranking second in formaldehyde. The World Health Organization formaldehyde has been identified as carcinogenic substances and to deformities, a recognized source of allergy, but also the strong potential of one of the mutation. Research shows that: Formaldehyde has a strong carcinogenic and Cuai role. Large number of literature, formaldehyde on human health effects of major performance anomaly in the sense of smell, stimulate, allergies, lung function abnormalities, abnormal liver function and immune function, and so on. Their concentration in every cubic metre of air reached 0.06 -0.07 mg / m3, the children will be a minor asthma. When the formaldehyde content in indoor air for 0.1 mg/m3, there is smell and discomfort; reached 0.5 mg/m3, it can stimulate the eyes, caused tears; reached 0.6 mg/m3, can cause throat discomfort or pain. At higher concentrations, can cause nausea and vomiting, coughing or chest tightness, wheezing and pulmonary edema; reached 30 mg/m3, would immediately cause death. Long-term exposure to low doses of formaldehyde can cause chronic respiratory diseases, caused nasopharyngeal cancer, colon cancer, brain tumor, menstrual disorders, the nucleus of the gene mutation, DNA single chain of cross-linked and cross-linked DNA and proteins and inhibit DNA repair the damage, pregnancy SARS, the cause of neonatal chromosomal abnormalities, leukemia, young people from memory and mental decline. In all contacts, children and pregnant women are particularly sensitive to formaldehyde, the greater harm it. Decoration and furniture are the main pollutants. Its release period of up to 3-15 years, the case of heat wave will be met from the volatile materials from deep, serious pollution of the environment has become difficult to solve global problems. The elderly, children and pregnant women the most damaging.