Skin diseases caused by arsenic and its compounds

1. Industrial application Smelting and roasting arsenic-containing ore, sublimation to obtain arsenic trioxide (As2O3), used in the glass industry and insecticide, rust removal, anticorrosion. Arsenic trichloride is used in the radio industry and porcelain polish, to produce arsenic-containing pigments, such as copper arsenite acetate (Paris green). Arsenic-containing pesticides such as calcium arsenate [Ca3 (AsO4) 2], sodium arsenite (NaAsO2), and arsenic pentoxide (As2O5). It can also be used to produce arsenic drugs, such as 914 injections. 2. Physical and chemical properties: Arsenic has three allotropic forms: gray, yellow and black. Insoluble in water, soluble in nitric acid and aqua regia. Easily oxidized in humid air. Elemental arsenic has very low toxicity; arsenic compounds such as oxides, salts and organic compounds are toxic. Trivalent arsenic compounds are more toxic than pentavalent arsenic compounds.