According to jiangxi cdi news, many people speak of formaldehyde. I'm not sure i'm safe at home. Don't worry, today we'll be a “magazine crusher” and talk about formaldehyde together。
What is formaldehyde? Why do you care
Formaldehyde is a colourless, irritant gas and is one of the most common pollutants in indoor air. The world health organization (who) classifies it as a carcinogen, i. E. A substance that is clearly carcinogenic to humans. Long-term exposure to low-dose formaldehyde can cause chronic respiratory disease, nasal cancer, loss of memory and mental capacity of adolescents, and even leukaemia。
Rumor one: no taste = safe
When they move into their new homes, many people are used to smell the air — if they don't have a distinct smell, they think they can get in. This practice hides a considerable health hazard。
Indeed, the sense of smell of formaldehyde is very limited and individual differences are significant. Even if indoor formaldehyde concentrations were exceeded, many people could still not smell any abnormal smell. It is particularly important to note that children, pregnant women and the elderly are more sensitive to formaldehyde and have higher health risks. Long-term exposure to low levels of formaldehyde is an important risk factor for blood system diseases such as leukaemia and lymphoma, and can cause chronic respiratory diseases and reduced immunity。
Thus, the potential danger of formaldehyde, judged as “a blind crosswalk” alone by its smell, cannot be ignored. A truly reliable approach has always been to rely on detection data from scientific instruments。
Rumour two: the earth's method is a decorum device
In dealing with indoor formaldehyde, "net-red" dehyde methods such as green planting, grapefruit skins, tea leaf infarction are favoured. These methods, while sound simple and easy, have had disappointing practical results. The truth is that the decorum effect of these “net-red” methods is minimal or even completely ineffective. Green planting is very inefficient in metabolism of formaldehyde through photocosm and its decontamination is negligible in normal living conditions. And grapefruit skins, tea caps, vinegar, etc., merely mask the irritation of formaldehyde with a stronger scent, which is a “favorite deceptive”, without adsorbing or dissolving the formaldehyde molecules themselves。
It is even more alarming that these methods have little impact on formaldehyde concentrations in closed spaces. Relying on these ineffective “earth methods” will not only fail to solve the formaldehyde problem, but may delay the necessary governance measures because of the creation of “security illusions”, which may lead to greater security risks。
Rumour three: no formaldehyde in the old house
After years of renovation, many residents tend to think, "my house has been in it for years, and formaldehyde should have been okay." while this idea is understandable, the scientific truth is that there may be considerable pitfalls in this recognition。
The release of formaldehyde is a process that has been going on for many years and is slow to decline and does not end in the short term. The first months of the renovation will be relatively large and will then slow down, but it will continue to release slowly and continuously from the depths of man-made plates for the next 3 to 15 years or more。
Therefore, the safety of indoor formaldehyde cannot be judged simply by the time of renovation. Continued attention to indoor air quality continues to be an important component of family health, especially in poorly ventilated rooms or in high temperatures and humidity。
Scientific action guide: remember these four points and leave formaldehyde anxiety
One is scientific testing: using data instead of speculation
Accurate knowledge of indoor formaldehyde should not be based on feeling, but on scientific means of detection:
Specialized institutions: priority is given to the selection of institutions with cma (credential of measurements in china), which perform sampling and analysis in accordance with national regulatory methods, with legal force and reliability。
(b) household detectors: when self-detection, instruments using electrochemical sensors should be chosen to avoid the purchase of cheap semiconductor detectors to ensure the reference value of data。
Formaldehyde self-detection box: suitable for initial screening. Attention is drawn to: placement at respiratory heights (0. 5-1. 5 m); strict adherence to placement and colour time; results are only semi-quantitative references and are not a substitute for professional testing。
Two is source control: prevention is the best governance
The most fundamental way to control formaldehyde is to close it at the renovation and purchase stage:
(1) core mouth: remember “one check of reports, two checks of authentication, three cuts”
Check report: request a formaldehyde release report for the product。
See certification: recognition of the enf > e0 > e1 and the "ten ring certification" logo。
Reductions: in particular for children's rooms and bedrooms, furniture is inadequate and sufficient space is left。
(2) material selection:
Priority is given to wood furniture。
A tablet of unaccompanied formaldehyde (the chemical name of mdi is diphenylamethane diisocyanate, a new type of adhesive without formaldehyde content per se)。
For paint, water paints are more environmentally friendly than oily paints。
Third is continuous ventilation: the most cost-effective solution
In any case, window ventilation is an irreplaceable basis:
(1) effective ventilation techniques:
Open doors and windows further away and form air currents。
The preference is ventilation between 10 a. M. And 4 p. M., at which point the conditions for atmospheric diffusion are good。
The new renovation is proposed to continue the ventilation for three to six months。
(2) auxiliary enhancements:
(c) placing a wavehead fan in the interior to accelerate air flow。
Families in a position to do so may consider the installation of a new wind system, which will allow for a 24-hour continuous air change。
The fourth is complementary governance: accelerated solutions
On the basis of ventilation, other governance methods can be used to complement:
(1) physical adsorption:
Activated carbon: select products with high iodine values but with limited adsorption capacity, they become saturated. Having access to outdoor tan, which removes some of the vapours but cannot effectively remove formaldehyde, it is recommended that new carbon packages be replaced periodically (e. G. Monthly) to ensure effectiveness。
Air cleaners: select products with high-efficiency hepa filters and full capacity of activated carbon and periodically replace filters。
(ii) professional governance:
If the formaldehyde problem is serious, specialized institutions can be sought for governance using technologies such as photo-catalyzed oxidation, closed method or constant temperature catalytic oxidation. (journalist)
