When everyone pays attention to the advantages of high luminous efficiency and energy saving of LED light sources, LED lighting has a very important advantage - no mercury, but it is often overlooked. We know that mercury is an extremely toxic substance. However, almost all currently used high-efficiency electric light sources contain mercury (mercury), whether it is a common fluorescent lamp, a compact energy-saving lamp, or a high-pressure mercury or metal halide lamp. Contains mercury.
Mercury has a very low boiling point and can evaporate at room temperature. After a broken discarded light source is broken, mercury vapor is immediately emitted to the surroundings, and the concentration of mercury in the ambient air can be instantaneously increased to 10-20 mg/m3, exceeding the national maximum allowable concentration of mercury in the air (0.01 mg/m3). m) 1000 to 2000 times. According to the study of mercury at Stanford University in the United States, 1 mg of mercury is enough to contaminate 5454.5 kg of drinking water, making it unable to meet safe drinking standards. The consequences of the air and water pollution caused by mercury are very serious. After being eaten by aquatic organisms, CH3Hg is produced. This is a highly toxic substance, as long as half an ear spoon can cause death. Mercury itself destroys the central nervous system, and the effects of reproductive defects it causes are also very serious. Mercury can also damage the kidneys and liver, and it can even lead to death if the dose is sufficient. Mercury can be transferred in different ways in the soil, water flow, even the atmosphere, and the food chain. Therefore, persistence, easy mobility, and high bio-concentration make mercury one of the world's most attractive environmental pollutants. The most serious incident of mercury poisoning in history was the Japanese Minamata disease, when hundreds of people died from mercury contamination in Minamata Bay. Now the Japanese government has learned a lesson and demanded that all obsolete fluorescent lamps must be treated with toxic substances, requiring people who purchase ordinary fluorescent lamps to pay twice as much to prepay the treatment fee for toxic substances.
Recently, the Chinese government issued 100 million energy-saving lamps free of charge. Although recently, the mercury content of special low-mercury energy-saving lamps abroad can be reduced to less than 5 mg (it is not known whether the Chinese government issued such low-mercury energy-saving lamps), but in the slightest Nor did it reduce its harmfulness because the mercury content of such a low-mercury energy-saving lamp was enough to contaminate 27.27 tons of drinking water. And 100 million energy-saving lamps are enough to pollute 2.7 billion tons of water, which is equivalent to the amount of drinking water for the people of the country for several years.