Heavy Metal Lead Pollution - Instead of using Lead in Sea Fishing, Change to Iron

As we all know, the method of free-flowing fishing is closely related to plumb. The plumb used in deep sea varies from 50g to 5kg, then hangs on the earth or meets the broken line of monsters. It is common to sacrifice the plumb fishing group in various ways, but it is estimated that few people really care about the pollution of plumb to the sea. In order to protect the marine environment, the plumb used by the Japanese is mainly made of iron, however. Almost all of our country uses lead!

Enthusiastic fisherman Kathy uses steel bars to make falls for release. In addition to reducing pollution, iron falls made of steel bars are also easy to carry, as shown below.

Lead, a heavy metal, is toxic. Among all known toxic substances, lead is the most recorded in books. It is recorded in ancient books that it is dangerous to transport drinking water with lead pipes. However, heavy metal pollution is an unbearable burden for the oceans.

The following information comes from Baidu: Heavy Metals Pollution to the Ocean

China is a large maritime country with a coastline of 184,000 kilometers and abundant resources. In recent years, with the rapid development of economy, a series of serious marine environmental problems such as coastal pollution have emerged. Since the 1980s, China's marine pollution problem has become increasingly serious. By the 1990s, China's coastal pollution has been quite serious. The area of the coastal water quality inferior to the first class of sea water quality standards has increased from 100,000 square kilometers in 1992 to 220,000 square kilometers in 1999. By 2012, some coastal waters were still seriously polluted, with an area of 170,000 square kilometers that did not meet the first-class water quality standards, which was higher than the average level of 150,000 square kilometers from 2007 to 2011. The coastal waters with inferior water quality are about 68,000 square kilometers, an increase of 24,000 square kilometers over the previous year. The coastal waters of about 19,000 square kilometers are in a state of severe eutrophication.

Where does marine heavy metal pollution come from?

Whether you like it or not, heavy metals are everywhere. Heavy metals are a natural part of the earth. Some of them are indispensable to life, while others are totally useless. Almost all heavy metals are of great use in industrial production, which is the main source of heavy metal pollution in the environment.

Unlike degradable organic pollutants, heavy metals circulate indelibly in nature. Rock weathering, dust flying, volcanic eruption, Baichuan to the sea - heavy metals through these processes from land to the sea. Heavy metals do not stay in surface seawater for long. They adsorb on particulate matter and then sink into sediment. After a long period of time, the sediment layer is covered with rocks and heavy metals are confined to it again. However, human activities disturb the slow and orderly cycle of nature.

Ore mining, metal smelting, production, use and abandonment of metal products, human activities are releasing heavy metals into the environment. This greatly improves the circulation of heavy metals in the environment and their concentration in water, soil, air and other media. Although in the face of natural forces such as tsunamis, earthquakes and typhoons, human beings seem extremely small, but the ability of human beings to emit heavy metals has been comparable to nature, even far more than nature. To make matters worse, heavy metal pollutants are not evenly dispersed in the ocean, but concentrated in coastal waters, where humans live and produce fisheries. After the Industrial Revolution, the marine ecosystem felt the tremendous pressure caused by human pollution.

Heavy metals emitted by humans are transported into the ocean through the atmosphere. For example, coal combustion produces tiny particles that float in the air, which can carry heavy metals for long distances and eventually sink into offshore or even ocean. However, heavy metals in the offshore are mainly transported from rivers and directly discharged into the sea from domestic sewage and industrial wastewater. For a specific sea area, a factory, a sewage outlet may be the main source of heavy metals. The mercury pollution incident in Minami Bay in 1950s is a typical case.

A plastic factory called "asphyxian" in Mitsui City, Japan, uses mercury as a catalyst to produce acetaldehyde, which produces methylmercury as a by-product. Methylmercury is discharged into Minamata Bay with wastewater and then absorbed and enriched by fish, shrimp and shellfish. The contaminated seafood was put on unknown local tables, resulting in poisoning of at least 2,265 people, of whom 1,784 were killed. The world-shaking ecological disaster has made people realize that dumping heavy metals into the sea will not only destroy ecosystems, but also endanger humans themselves through the food chain.

Marine heavy metal pollution can not be ignored?

Heavy metal pollution is different from that of other organic compounds. Many organic compounds can be reduced or eliminated by physical, chemical or biological purification of nature itself. Heavy metals are enriched and difficult to degrade in the environment. Heavy metals discharged with wastewater, even at very low concentrations, can accumulate in algae and sediment, be adsorbed on the surface of fish and shellfish, and aggregate in organisms through food chains, causing mutations in genetic materials of marine organisms, leading to slow growth and abnormal development of organisms, reducing the survival rate of embryos, larvae and adults, and even leading to the extinction of sensitive species. Ecological degradation.

Heavy metal pollution is a direct and indirect threat to ecosystems. Heavy metals accumulate in the human body through the enrichment and amplification of the food chain, which destroys the normal physiological and metabolic activities of the human body and damages human health.

After being eaten by aquatic organisms, mercury is converted into methylmercury in vivo, which can destroy blood vessels of brain tissue and cause a series of symptoms of central nervous system poisoning, such as hand, foot, lip numbness and red pain, speech disorder, hearing loss and other typical symptoms of cerebral arteriosclerosis patients; methylmercury can also lead to abortion, malformed fetus and congenital dementia. Er et al. is extremely toxic.

Lead ingested by organisms binds to a variety of enzymes, thus interfering with various physiological activities of organisms and causing harm to the whole body organs. The most important is the influence on nervous system, kidney, hematopoietic system and blood vessels. Lead poisoning is characterized by anemia, abdominal pain, hypertension, etc. Low-dose lead exposure can adversely affect the functions of human red blood cells, kidneys, immune system, bone marrow and central nervous system, all of which may not have obvious clinical symptoms before they occur. Lead poisoning affects infants'initial standing, walking and speaking