CAS: 7439-92-1, introduction of lead powder

**English Name:** Lead **Other Name:** Plumbum (Latin), Lead **CAS Number:** 7439-92-1 **Chemical Symbol:** Pb **Atomic Weight:** 207.20 **Purity Level:** 5N (99.999%) **Appearance:** Silver-gray metal **Properties:** Heavy, soft, and highly ductile. Easily melted, cast, rolled, and extruded. Can be alloyed with various metals. Has a cubic crystal structure. The freshly cut surface is bright, but it quickly loses its luster when exposed to air. **Reactivity:** - Reacts with hot concentrated nitric acid, boiling concentrated sulfuric acid. - Under aerobic conditions, it can be corroded by pure water and weak organic acids. - Resistant to hydrofluoric acid, tap water, seawater, and many solvents. - Dissolves gradually in bases, forming lead salts. **Physical Properties:** - Relative density (d₂₀⁴): 11.34 - Melting point: 327.4 °C - Boiling point: 1740 °C - Vapor is toxic. **Common Forms:** Available in various shapes such as tablets, foils, granules, and powders. **Applications:** Widely used in biochemical research, as a reducing agent for tin analysis, in the reduction of high-valent iron to ferrous iron, and in the separation of rhodium from platinum-rhodium alloys. Also used in alloy manufacturing and preservation. Lead is a versatile and historically significant metal, known for its unique physical and chemical properties. However, due to its toxicity, proper handling and disposal are essential in all applications.

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