At what temperature is formaldehyde released

Formaldehyde is usually released only under certain conditions. When the temperature gets higher and higher, the amount of formaldehyde released will definitely increase, and may even be faster. This is actually because the release of formaldehyde is related to the increase in temperature. Therefore, if you want to have no formaldehyde in your room, it is best to open the windows frequently for ventilation, which will have a better effect.

1. Current status of indoor environmental pollution

Indoor air pollution

It is considered to be the third type of air pollution after "coal smoke pollution" and "photochemical smog pollution". Formaldehyde, as one of the main indoor pollutants, poses a serious threat to human health. In particular, the problem of formaldehyde exceeding the standard caused by indoor decoration has attracted people's great attention. There are more than 500 kinds of volatile organic compounds in indoor air, including more than 20 carcinogens and more than 200 pathogenic viruses. The main hazards are: radon, formaldehyde, benzene, ammonia, esters, trichloroethylene, etc. A large number of shocking facts have confirmed that indoor air pollution has become an "invisible killer" that endangers human health.

It is an issue of common concern to countries around the world. Studies have shown that indoor air pollution is 2 to 5 times more serious than outdoor air, and in special circumstances can reach 100 times. Therefore, the United States has classified indoor air pollution as one of the five major environmental factors that endanger human health. The World Health Organization also lists indoor air pollution as one of the top 10 threats to human health, along with high blood pressure, high cholesterol and obesity. Characteristics and hazards of indoor air pollution Indoor air pollution has the following characteristics: (1) High concentration of pollutants

(2) Long contact time (3) Wide impact range (4) Many types of pollutants (5) Long emission cycle (6) Different time periods for harm to manifest

2. Formaldehyde release is related to temperature

The effect of temperature on formaldehyde release is due to the adsorption of formaldehyde remaining in the pollution source and the decomposition of organic matter.

On the solid surface, when the temperature rises, the desorption of formaldehyde is enhanced and the release rate of formaldehyde is also accelerated. Regarding the relationship between indoor formaldehyde emission and temperature, G. E． Mayer proposed the following mathematical model:

C(T)/Co(298)=exp[B((1/Y)-(1/298))] where: T is temperature, k; C (T) is the indoor formaldehyde concentration at temperature T; Co(298) is the indoor formaldehyde concentration at temperature 25°C; B is the temperature coefficient, and the statistical result is -8930K. The above formula shows that the effect of temperature on indoor formaldehyde concentration is exponential. The model assumes that relative humidity, air exchange rate and loading degree are constant.

Taking 25"C as the standard temperature, the influence of temperature is discussed. From the formula, it can be seen that as the temperature increases, the overall level of formaldehyde emission will increase accordingly.