Most of the faucets on the market that contain trace amounts of lead are cast copper alloys. The lead content of 4-8% will be oxidized and form a protective film when it meets air. When it meets water, this protective film will fall off, so that the lead will be mixed with water, so that the lead precipitation 0.2. The main material of lead casting process is brass HPb59. brass is an alloy of copper and zinc. When the element lead comes into contact with air, it oxidizes and forms a protective film. The lead has to be shed and immersed in water, during which it causes the precipitation of lead elements. Also, because tap water uses chlorine as a disinfectant, the residual chlorine in the water accelerates the aging of the faucet and the precipitation of the lead. Use of copper faucets and water pipes for more than five years can increase lead levels by a significant 0.3, as well as the use of recycled copper as a lead material. When the industry was just emerging, some consumers believed that the heavier the faucet, the thicker the walls and the greater the resistance. Over time, some unscrupulous businesses in order to meet the consumer focus on the weight of the product consumer psychology, the use of recycled copper (other factories to refine the remaining copper slag) as raw materials, adding stainless steel parts in the faucet or other alloy parts (such as zinc alloy), the use of high lead in the faucet parts, resulting in increased impurities, directly caused by the product heavy metal content, and cause secondary pollution of the water.
The faucet in the process of using precautions.
- After the tap water stops working for several hours, be sure to open the faucet for 1 to 2 minutes before use. Do not drink the tap water overnight.
- Hot water is now available in many homes. However, it is best not to use it for drinking or cooking because the lead content in hot water is many times higher than in cold water.
- When we buy faucets, we must make sure to choose lead-free products.
- Installing a water purifier . According to the degree of filtration, the water purifiers on the market can be divided into coarse filtration (activated carbon adsorption), ultrafiltration and reverse osmosis three kinds of filtration from coarse to fine. From the filter material of the water purifier, most of the core will use PP cotton, activated carbon and other materials, of which the higher price will use RO reverse osmosis membrane. RO reverse osmosis membrane aperture is small to the nanometer level, under certain pressure, water molecules can pass the RO membrane, and the source water inorganic salt, heavy metal ions, organic matter, colloids, bacteria, viruses and other impurities can not pass the RO membrane.