Heavy metals generally refer to metals with a density greater than 4.5g per cubic centimeter, such as lead (Pb), cadmium (Cd), chromium (Cr), mercury (Hg), copper (Cu), gold (Au) and silver (Ag). Some heavy metals enter the human body through food, which interferes with the normal physiological function of the human body and harms human health. They are called toxic heavy metals. These metal elements mainly include lead (Pb), cadmium (Cd), chromium (Cr) and mercury (Hg).
Heavy metal mercury: it mainly harms the central nervous system, damages the brain, and causes symptoms such as numbness of limbs, dyskinesia, reduced vision, hearing difficulties and even death due to heart failure caused by mercury poisoning encephalopathy. Severe poisoning can cause oral diseases, nausea, vomiting, abdominal pain, diarrhea and other symptoms, and can also cause damage to skin mucosa, urinary and reproductive systems. Under the action of microorganisms, methylmercury is methylated, which is more toxic than mercury.
Heavy metal cadmium Cd: It can accumulate in human body and cause acute and chronic poisoning. Acute poisoning can cause vomiting blood, abdominal pain and finally death. Chronic poisoning can damage renal function, destroy bones, and cause bone pain, osteomalacia and paralysis.
Heavy metal chromium: it is irritating and corrosive to skin, mucous membrane and digestive tract, causing skin congestion, erosion, ulcer, nasal perforation and skin cancer. It can accumulate in the liver, kidney and lungs.
Metalloarsenic-like As: Chronic poisoning can cause skin lesions, nervous system, digestive system and cardiovascular system disorders, and has cumulative toxic effects, destroying the metabolic system of human cells.
Heavy metal lead: it is mainly harmful to nerves, hematopoietic system and kidneys, damages the skeletal hematopoietic system, and causes anemia, brain hypoxia, brain edema, abnormal movement and sensation.
Harm to human body:
The harm of heavy metals to human body is common:
Mercury: It sinks directly into the liver after ingestion, which is extremely harmful to the visual nerve of the brain. Natural water containing 0. 1 ml per liter of water is highly toxic. Drinking water containing trace mercury for a long time will cause cumulative poisoning.
Chromium: It will cause numbness of limbs and mental abnormality.
Cadmium: causes hypertension and cardiovascular and cerebrovascular diseases; Destroy bone calcium, resulting in renal insufficiency.
Lead: It is one of the most toxic heavy metal pollution, and it is difficult to eliminate once it enters the human body. Direct damage to human brain cells, especially fetal neural plate, can cause congenital shallow cerebral sulcus and mental retardation; Leading to dementia and brain death in the elderly.
Cobalt: Radiation damage to skin.
Vanadium: It hurts the heart and lungs and causes abnormal cholesterol metabolism.
Antimony: containing arsenic, silver jewelry will turn brick red, which is harmful to the skin.
Thallium: It can cause polyneuritis.
Manganese: Too much will make people hyperthyroidism.
Tin and lead are important components in the ancient highly toxic drug' Qiu', which solidified into blocks after entering the abdomen, causing death.
Zinc: Excessive intake will lead to zinc poisoning.
Any of these heavy metals can cause headache, dizziness, insomnia, forgetfulness, insanity, joint pain, stones, cancers (such as liver cancer, stomach cancer, intestinal cancer, bladder cancer, breast cancer, prostate cancer, Blackfoot disease and deformed children) and so on. It is recommended to pay attention to diet, otherwise it will bring a lot of harm to the body once it precipitates in the body.