cadmium, heavy nonferrous metal element, chemical symbol Cd, atomic number 48,1817.

Simple substance is silvery white metal, which is an excellent metal to absorb neutrons. Rod can slow down the chain reaction of nuclear fission rate in nuclear reactors, and it is quite useful in zinc-cadmium batteries. Its sulfide is bright in color and is used to make cadmium yellow.

the ratio of matter to cadmium in the crust is 1,111,111: 1.1 ~ 1,111,111: 1.5. It is extracted from zinc ore or cadmium sulfide ore as a by-product, and is mostly used to protect other metals from corrosion and rust, such as electroplated steel, iron products, copper, brass and other alloys. Another use is to make a bright yellow pigment called cadmium yellow, which can be used as a high-grade paint and painting pigment.

Biotoxicity

Cadmium can irritate the respiratory tract, and long-term exposure will cause olfactory loss, yellow spots on the gums or yellow circles gradually. Cadmium compounds are not easily absorbed by the intestine, but can be absorbed by the body through breathing, and accumulated in the liver or kidney, causing harm, especially to the kidney. It can also cause osteoporosis and softening.