Many people do not know that the original tap water is polluted by lead and other harmful substances due to the problems of pipes and faucet materials. The Shanghai Consumer Protection Committee once found in the comparative test of faucet products that 22% of the sampled samples had lead exceeding the standard, and some products exceeded the standard by 20 times. The Beijing Consumers Association also tested some of the faucets sold in the market. In the major building materials market and supermarkets in Beijing, 50 kinds of faucet products were randomly purchased and commissioned by relevant departments. The results showed that in the 10-hour and 24-hour lead precipitation concentration tests, only two stainless steel samples were completely lead-free. Why is lead in tap water? How to prevent secondary pollution of tap water by tap water?
Where does lead from tap water come from?
According to Prof. Fu Songtao, deputy director of the Expert Committee on Lead Prevention and Control of the China Policy Science Research Institute, at present, China's water pipelines are gradually being replaced by galvanized iron pipes into plastic (such as PVC, PE, UPVC, etc.) pipes, while most household faucets still use It is cast iron or copper alloy. The main components of copper alloy faucet are copper and zinc, in addition to lead, aluminum, tin, iron, manganese and other elements. The lead element will precipitate after long-term contact with water, and the more lead content in the faucet material, the more precipitation.
In addition to faucets, cast iron pipes, copper pipes and plastic pipes also contain lead more or less. If these materials are used in water pipelines, it will also cause lead pollution.
Lead pollution pregnant women suffer the most
The child is anorexia and picky, not long, has been plagued by many parents. The doctor reminded that the above situation should be taken to the hospital to test blood lead levels. According to some data, for every 100 micrograms per liter of blood lead, the child's height will be 1-3 centimeters less. Blood lead rises by 100 micrograms per liter, children's IQ will be reduced by 6-8 points; blood lead levels in infants and young children will be greater than 200 micrograms per liter, children's primary school dropout probability is 7.4 times larger, and there is a 5.8 times more difficulty in reading difficulties. .
Lead can cause damage to children's multiple organs and multiple systems, and damage to the brain is even irreversible throughout life. Lead accumulates in children, easily damages the nervous and endocrine systems, leading to mental retardation and growth retardation in children; affecting mineral absorption, causing deficiency of nutrients such as zinc, iron, calcium, etc., causing diseases such as picky eaters, anorexia, anemia and rickets; Gastrointestinal neurovascular system, leading to digestive system dysfunction, causing constipation, diarrhea and unexplained abdominal pain, and so on. These conditions are further aggravated as the degree of lead damage increases and time prolongs. It is worth noting that very low levels of lead exposure can cause many children to have abnormal behaviors such as distraction, hyperactivity, decreased learning ability, irritability, and aggressiveness.
Lead pollution also causes great harm to pregnant women. Excessive blood lead will increase the possibility of miscarriage, premature delivery, premature rupture of membranes and stillbirth.
Drinking water overnight
According to the Beijing Consumers Association's test data on the concentration of lead in the faucet, the concentration of lead in most samples was 0.002 mg/L - 0.223 mg/L under 10 hours of soaking. The concentration of lead in the 24-hour soaking range was 0.001 mg/L. -0.208 mg / l. It is not difficult to see that the "overnight water" that the faucet is stranded has a higher lead metal content.
It is understood that because the current national standards for faucets do not specifically impose mandatory regulations on lead content and precipitation, the lead inspection of domestic market sales has not used lead as a quality criterion. However, in recent years, the problem of lead contamination caused by cast iron and copper faucets has caused widespread concern in many countries. It is reported that the United States has enacted a lead-free bill, stipulating that the lead content of the faucet should not exceed 0.25%, and European and American countries are also actively formulating relevant bills. China is also about to launch a new national standard for faucets. The limitation of lead precipitation will become the key content of the new standard. Some institutions have developed new faucets without lead.
As an essential plumbing appliance in daily life, the quality and safety of faucets are closely related to people's health. Professor Fu Songtao suggested that residents can take some measures to reduce the risk of lead pollution in drinking water. First, when the tap water is deactivated for more than 6 hours, be sure to turn on the tap for 1-3 minutes before use. Second, many households now have hot water supplies, but it is best not to use it as drinking water or cooking because the amount of lead in hot water is many times higher than that of cold water. Third, when purchasing a faucet, be sure to choose a quality standard product, preferably a stainless steel faucet. The stainless steel material is lead-free and does not cause secondary pollution of lead to tap water. (Beijing emblem)
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