Sodium cyanide (NaCN) is a white crystalline powder. In humid air, it has a slightly bitter almond smell due to moisture absorption. Easily soluble in water, the aqueous solution is strongly alkaline H2O + CN(-) = HCN + OH(-). Extraction of gold and silver from ores, electroplating, metal quenching, and pesticide manufacturing can all come into contact with this product. Occupational poisoning is mainly caused by inhalation of dust in the respiratory tract or inhalation of vapor formed by sodium cyanide during heat treatment. Sodium cyanide is also absorbed through the skin and digestive tract. Chinese alias: Shannai English alias: Cyanogran Dangerous goods number: 61001 Molecular weight: 49.02 Melting point: 563.7℃ Boiling point: 1496℃ Density: Relative density (water = 1): 1.60 This product is highly toxic, and the oral lethal dose for humans is about this product It is highly toxic and the lethal dose for human oral administration is about 1~2 mg/kg. Its toxic effect is to release cyano groups in the body, which combine with Fe3+ of oxidized cytochrome oxidase, causing cytochrome to lose its ability to transmit electrons. As a result, the respiratory chain is interrupted, intracellular asphyxia occurs, and tissue hypoxia leads to poisoning.