Diatomaceous mud, a natural, environmental and healthy decorative wall material, is mainly made of diatomaceous earth from sea and lake. Recently, it has become an invisible killer for many people. Diatom mud, which has been controversial for a long time, has been pushed to the forefront of public opinion again. Is it as the rumor says or something else? Diatomite is a biogenic siliceous sedimentary rock, mainly composed of the remains of ancient diatoms. Because of its fine, loose, light, porous, heat-resistant, acid resistant, large specific surface area and stable chemical properties, it has been widely used in all walks of life. Diatom mud is one of the main applications.
However, diatomite as the main raw material, which has been regarded as "natural, environmental protection, health" decorative wall material, diatomite mud has recently become a "invisible killer" for many people.
Recently, CCTV weekly quality broadcast reported that the Shanghai Municipal Consumer Protection Commission conducted a sampling test on diatom mud products. In the sampling test of 17 diatom mud enterprises in the market, it was found that the radioactive elements in diatom mud products of three enterprises exceeded the standard, and the methylaldehyde purification performance of diatom mud products of four enterprises was more than 40% Next. After the release of the test results, many network platforms took advantage of the test results to make a high-profile voice, saying that diatom mud is toxic and harmful, and does not have the function of purifying formaldehyde. "Why do I strongly object to my friend's use of diatom mud", "unveil the top ten black curtain of diatom mud", "diatom mud can cause cancer" Recently, a number of statements directly pointing to the "problem" of diatom mud have been circulating on wechat, microblog and other network platforms. Diatomite, which has always been controversial, has been pushed to the forefront of public opinion again. Is diatomite as rumored or something else? What's the matter with all the different opinions? Where did the detected radioactive elements come from? Do diatom mud products have environmental health problems? Can formaldehyde be purified? [behind]
Artificial addition of auxiliary materials, radioactive elements "out of control"
has been adhering to the concept of environmental protection and health of diatom mud, is it really buried invisible "thunder"? In this regard, Huang Qiang, deputy chief engineer and professor level senior engineer of Sinoma engineering survey and Research Institute, said that diatomite, the main component of diatomite mud, is different from the mineral formed by geological processes. It is a mineral formed by life activities, so it can not exist in an environment where the radioactivity exceeds the standard seriously. In other words, the radionuclides of diatomite are basically It's impossible to exceed the standard. In other words, if there is no artificial addition of other raw materials, diatom mud products can not form the phenomenon of nuclide exceeding the standard.
In this case, why do some businesses sell diatom mud that is not up to the standard in terms of radioactive elements? In fact, the individual products with excessive radionuclides detected now are mainly due to the artificial addition of radioactive elements in diatom mud. " Ji Zhijiang, executive vice president of ecological environment building materials branch of China Building Materials Federation, director of Environmental Functional Materials Engineering Research Institute of Academia Sinica, and President of Zhongguancun diatom new material industry technology innovation alliance, said, "some brands add a large number of additives to their products in order to reflect their rich functions, resulting in the loss of their original environmental health. When consumers choose diatom mud, they should also try to avoid curiosity. "
It is said that diatomite may not be diatomite mud.
in addition to excessive radioactive elements, it is also disappointing that the formaldehyde purification rate of four of the 17 enterprises tested this time is below 40%, which is far from the 80% or even 90% purification effect indicated on the package. This has cast a shadow on the diatom mud which has been questioned repeatedly in the effect of formaldehyde purification. Can it purify formaldehyde? How much formaldehyde can be purified? It has become a question mark in the hearts of consumers.
It is certain that diatom mud has unique "molecular sieve" structure and selective adsorption performance, which makes it have air purification function. It is one-sided to say that diatom mud is only decorative. " In the face of consumers' doubts, Wang Jing, Secretary General of the ecological environment building materials branch of China Building Materials Federation and deputy director of the Institute of environmental functional materials engineering of Academia Sinica, gave a positive reply. "However, due to the uneven quality of products in the market, there is an obvious gap in the purification rate of diatom mud. In fact, the national standard "diatom mud decorative wall materials" (JC / t2177-2013) clearly stipulates the detection method of diatom material composition. When the proportion of diatomite in the formula is greater than 10%, it can be detected by the method in Appendix A, and it is easier to detect more than 15% "
In other words, the diatomite content of products that can be defined as diatomite mud should be at least 10%, and the purification rate of formaldehyde should be more than 80%. However, some fake and inferior wall materials on the market make up for the number. If diatomite is added into putty or ordinary dry powder coating, the diatomite mud label is pasted. It is only for a good price, but it has no practical function.
[tips]
two reports with "double insurance" and two labels with "anti counterfeit goods"
There's no reason to talk. When choosing diatom mud products, no matter how much business talk, it's not worth talking with products. For less professional consumers, authoritative certification and data is the most valuable reference.
In this regard, when purchasing diatom mud products, we should first try to choose the big brands in the regular stores. At the same time, we can ask the merchants to show the test reports that meet the corresponding standards, such as "diatom mud decorative wall materials" (JC / t2177-2013), "national standard for limit of harmful substances in interior decoration materials" and "limit of radionuclides in building materials" (gb655-2010). In addition, the authenticity of diatom mud can be judged and distinguished by purification (bottom left) and humidity control (bottom right).
It should be noted that in the corresponding test report, consumers need to pay attention to whether the test time and product batch are consistent with the products they choose to avoid the problem of using expired reports.
source: Beijing Youth Daily
