The original meaning of heavy metals refers to metals with a specific gravity greater than 5 (generally speaking, metals with a density greater than 4.5 grams per cubic centimeter), including gold, silver, copper, iron, lead and cadmium. When heavy metals accumulate in the human body to a certain extent, it will cause chronic poisoning. However, heavy metals are difficult to be biodegraded. On the contrary, they can be enriched thousands of times under the biomagnification of the food chain and eventually enter the human body.

Heavy metals can interact strongly with protein and enzymes in human body, making them inactive, and may accumulate in some organs of human body, leading to chronic poisoning.

Zinc is a silvery white metal with a light blue color and a density of 7. 1.4 g/cm3, so zinc is a toxic heavy metal.

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The existence of heavy metals

Air, soil and even drinking water contain heavy metals, such as free radicals that lead to aging, particles harmful to the skin, dust in the air, automobile exhaust and so on. Even tap water will bring heavy metals to the skin, and even some skin care products such as moisturizing cream and other heavy metal raw materials such as cadmium are one of them. The accumulation of heavy metals is quite harmful to human body.

Intake of heavy metal poisoning

In the acute stage, nausea, vomiting, abdominal pain, bloody stool, shock, hypotension, hemolysis, hepatitis, jaundice, acute renal failure, coma and convulsion will occur. In the subacute stage, there will be peripheral neuritis, with Mie's line on the nail and a white horizontal line of 1-3mm on the nail. ) appear.

Human injury

The harm of heavy metals to human body is common:

1, mercury: it sinks directly into the liver after eating, 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.

2, chromium: it will cause numbness and mental abnormalities in the limbs.

3, cadmium: lead to high blood pressure, cause cardiovascular and cerebrovascular diseases; Destroy bone calcium, resulting in renal insufficiency.

4. 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.

5. Cobalt: It is radioactive to the skin.

6, zinc: excessive 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.

References:

Baidu encyclopedia-zinc

Baidu encyclopedia-heavy metals