Heavy metals, which are metals with a density greater than 4.5g/cm3, include gold, silver, copper, iron, mercury, lead, cadmium, etc. Heavy metals accumulate in the human body to a certain extent, causing chronic poisoning.
In terms of environmental pollution, heavy metals mainly refer to mercury (mercury), cadmium, lead, chromium and metal-like arsenic and other heavy elements with significant biological toxicity.
Heavy metals are very difficult to be biodegraded, but on the contrary, they can be enriched thousands of times in the food chain under the effect of biomagnification, and finally enter the human body. Heavy metals in the human body and protein and enzymes and other strong interactions, so that they are inactive, but also in some organs of the human body may accumulate, resulting in chronic poisoning.
