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What is heavy metal pollution?

Everyone knows about metal pollution. Do you know what heavy metal pollution is? Let's look at it together!
Heavy metal pollution refers to the environmental pollution caused by heavy metals or their compounds. Mainly from mining, waste gas discharge, sewage irrigation and the use of heavy metals excessive products and other factors. As human activities lead to heavy metal content in the environment, beyond normal range, directly endanger human health, and lead to deterioration of environmental quality.
Basic definition of heavy metal pollution:
Heavy metal pollution refers to the environmental pollution caused by heavy metals or their compounds. Such as Japan's Minamata disease is caused by mercury pollution. The extent of the damage depends on the concentrations and chemical forms of heavy metals in the environment, food and organisms. Heavy metals pollution is mainly found in water pollution, and some of them are in atmospheric and solid wastes.
Main characteristics of heavy metal pollution:
Heavy metals are metals with a specific gravity greater than 5 (metals with a density greater than 4.5 g per cubic centimeter), including gold, silver, copper, iron, lead, etc.. Heavy metal pollution is different from other organic compounds. Many organic compounds can be reduced or eliminated by physical, chemical, or biological purification of nature itself. Heavy metals are rich and difficult to degrade in the environment.
Heavy metal mercury is now a heavy metal pollution caused by heavy metals such as lead, mercury, cadmium and cobalt in the process of mining, smelting and processing of heavy metals. If the heavy metals discharged with wastewater, even if the concentration is small, can also be accumulated in algae and sediment, adsorbed on the surface of fish and shellfish, resulting in food chain concentration, thus causing public nuisance. The water in the metal beneficial or harmful species, not only depends on the physicochemical properties of metal, but also depends on the concentration of metals and the existence of the valence and form, even if the beneficial metal elements concentration exceeds a certain value will have severe toxicity to animal and plant poisoning, and even death.
Metal organic compounds (such as mercury, lead, arsenic and organic organic organic tin) than metal inorganic compounds corresponding much stronger toxicity; soluble metal and particulate metal toxicity to six chromium; trivalent chromium than toxicity and so on. Heavy metals have strong interaction in human body and protein and various enzymes, so that they may also lose activity in some organs of the body in the enrichment, if more than the body can withstand the limit, can cause acute poisoning, human sub acute poisoning, chronic poisoning, it will cause great harm to the human body, for example, Japan the occurrence of Minamata disease (mercury) and bone disease (CD) and other disease, are caused by heavy metal pollution.
Heavy metals are widely distributed in the atmosphere, water bodies, soil and organisms, while sediment is often the storage and final destination of heavy metals. When the environment changes, the forms of heavy metals in the sediments will change and release, causing pollution. Heavy metals are not biodegradable, but with bioaccumulation, can be a direct threat to higher organisms including humans, experts pointed out that the heavy metal pollution of soil is irreversible, the contaminated soil has not only the value of governance, the adjustment of planting varieties to be avoided. Therefore, people pay more and more attention to the heavy metal pollution of sediment.
Status of heavy metal pollution:
Science and technology is a double-edged sword. Since twentieth Century, the rapid development of science and technology has promoted the economic development and improved the people's living standard. At the same time, however, mankind has paid a heavy price. Because of the industrial "three wastes", the emission of motor vehicles, sewage irrigation and the use of pesticides, herbicides and fertilizers, and the development of mining industry, the soil, water quality and atmosphere have been seriously polluted.
According to reports, in 1989, China Nonferrous Metallurgical Industry to the environment emissions of heavy metals Hg, 56t, Cd for 88T, As for 173t, Pb for 226t. Scientists in the United States have carried out a chemical analysis of some roads and urban soils and found that lead levels were surprisingly high, reaching tens of times, or even hundreds, of the maximum allowable amount.
In 2004, Xia Houlin et al Chinese according to Pharmacopoeia 2000 version of an appendix heavy metal test and Ministry of foreign trade and Economic Cooperation issued by the import and export of medicinal plants and preparations for "green industry standard" in the lead, cadmium and mercury determination method of Yuanhuzhitong tablets in the determination of total heavy metals, the cadmium and mercury content in varying degrees exceed the standard.
3500-7700 of Bangladesh's 125 million people are drinking contaminated water. Heavy metal pollution has been very serious, its harm to the environment and life greatly, at the same time, it is easy to pass through the food chain and enrichment, therefore, have aroused the attention of scientists all over the world, to solve this problem is imminent.
Sources of heavy metals pollution:
The main sources of heavy metal pollution are industrial pollution, followed by traffic pollution and domestic waste pollution. Industrial pollution mostly through the waste residue, waste water and waste gas discharged into the environment, human and animal and plant enrichment, thus to the environment and human health caused great harm, industrial pollution control can reduce its pollution by some technical methods and management measures, and ultimately achieve national pollutant discharge; transportation vehicle exhaust pollution the emissions, the state has formulated a series of management measures, such as: the use of ethanol gasoline, installation of automobile exhaust purifier; domestic pollution is mainly garbage pollution, waste batteries, broken lighting lamp, did not run out of cosmetics, colored dishes, for as long as we control the heavy metal pollution from the source it can reduce the pollution of heavy metals, more or less.
Experts pointed out: the current technology development process, equipment, Chinese plastic production enterprises is relatively backward, is the main cause of serious pollution, and poor management, local protection and people's environmental protection consciousness, increased pollution, strengthen governance imminent. Production enterprises should look to the future, advocate environmental protection, and use environmentally friendly additives in order to make the PVC industry healthy and long-term development.
Do you know now? Don't throw away batteries, lights and so on.
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