What are the specific heavy metals? Thank you!

The original meaning of heavy metals refers to metals with a specific gravity greater than 5 (generally speaking, metals with a density greater than grams per cubic centimeter), including gold, silver, copper, iron, lead, etc., heavy metals accumulate in the human body to a certain extent, which will cause chronic poisoning. In terms of environmental pollution, heavy metals mainly refer to mercury (mercury), cadmium, lead, chromium and metal-like arsenic and other biologically toxic heavy elements.

Heavy metals are very difficult to biodegrade, but on the contrary, they can be enriched thousands of times by the biomagnification of the food chain and finally enter the human body. Heavy metals can interact strongly with proteins and enzymes in the human body, making them inactive, and may also accumulate in some organs of the human body, causing chronic poisoning.

The original meaning of heavy metals refers to metals with a specific gravity greater than 5, including gold, silver, copper, iron, lead, etc., and heavy metals accumulate in the human body to a certain extent, which will cause chronic poisoning.

There is no strict definition of what heavy metals are, and the metals are divided into heavy metals and light metals according to the density of the metals, and the metals with greater density are often called heavy metals. Such as: gold, silver, copper, lead, zinc, nickel, cobalt, chromium, mercury, cadmium and so on about 45 kinds.

From the perspective of environmental pollution, heavy metals refer to heavy metals with significant biological toxicity such as mercury, cadmium, lead, chromium and arsenic.

There are five types of poison that are most toxic to the human body: lead, mercury, chromium, arsenic, and cadmium. These heavy metals cannot be decomposed in water, and the toxicity is amplified after human drinking, and they combine with other toxins in the water to form more toxic organic or inorganic substances.

Heavy metal toxic non-metallic substances: arsenic, fluorine, cyanide, etc.

You're listening to heavy metal.

Metals with a density above are called heavy metals. There are 60 natural metal elements with atomic numbers from 23 (v) to 92 (u), and except for 6 of them, the other 54 are all greater than the relative density, so in the sense of relative density, these 54 metals are all heavy metals.

However, when it comes to elemental classification, some of them are rare earth metals and some are classified as refractory metals. In the end, 10 metal elements were actually classified as heavy metals in industry: copper, lead, zinc, tin, nickel, cobalt, antimony, mercury, cadmium and bismuth.

Mercury, nickel, chromium, lead, etc., check the periodic table, the mass is relatively large.

Heavy metal ion emission standards in GB21900 include lead, hexavalent chromium, total chromium, mercury, cadmium, nickel, silver, copper, zinc, etc.