Cerium

Cerium is a rare earth metal belonging to the lanthanide series of elements, with the chemical symbol Ce and atomic number 58. It is the most abundant of the rare earth elements and appears as a silvery-white, soft metal that tarnishes readily in air. Cerium has unique properties including its ability to exist in multiple oxidation states and its pyrophoric nature in finely divided form.

Cerium is a silvery-white metallic solid at room temperature with a density of 6.77 g/cm³ and melting point of 798°C. It readily oxidizes in air, forming a protective oxide layer, and is relatively soft and malleable. Cerium is insoluble in water but dissolves in dilute acids. The metal exhibits pyrophoric behavior when finely divided, igniting spontaneously in air.

Cerium is primarily used in catalytic converters for automotive exhaust systems due to its oxygen storage capacity. It serves as a polishing agent for glass and optical components, particularly in precision optics manufacturing. Other applications include lighter flints, arc carbons for studio lighting, phosphors in fluorescent lamps, and as an additive in special alloys and steel production.

Cerium requires careful handling due to its pyrophoric properties in finely divided form. Use appropriate personal protective equipment including safety glasses, gloves, and protective clothing. Work in well-ventilated areas away from ignition sources and oxidizing materials. Avoid creating dust or fine particles, and handle bulk material with non-sparking tools. Keep fire extinguishing equipment readily available during handling operations.

Cerium must be stored in a cool, dry place away from heat sources and ignition sources due to its pyrophoric nature. Keep containers tightly sealed to prevent oxidation and moisture exposure. Store away from strong oxidizing agents and acids. Use appropriate storage containers that prevent mechanical damage and dust generation. Maintain storage areas with adequate ventilation and fire prevention systems.

Cerium exposure requires immediate first aid measures depending on the contact type. For skin contact, remove contaminated clothing and wash affected area with soap and water. In case of eye contact, flush immediately with clean water for at least 15 minutes. If inhaled, move to fresh air immediately. For ingestion, do not induce vomiting and seek medical attention. Always consult medical professionals for any exposure incidents.

Cerium disposal must comply with local and European waste regulations as it is classified as hazardous waste. Do not dispose of cerium in regular waste streams or pour down drains. Contact licensed hazardous waste disposal companies for proper treatment and disposal. Small quantities should be collected and stored safely until professional disposal can be arranged. Always follow national environmental protection guidelines.

Cerium is classified under ADR Class 4.2 (Substances liable to spontaneous combustion) Packing Group I, indicating high transport risk. It requires specialized packaging meeting UN specifications and proper hazard labeling. Transport must be conducted by certified carriers with appropriate documentation including transport emergency cards. Vehicles must be equipped with suitable fire extinguishing equipment and emergency response materials.

Cerium is regulated under various European frameworks including REACH registration requirements for commercial use. While not classified as SVHC (Substance of Very High Concern), it falls under CLP regulation for hazard communication. Transport is strictly regulated under ADR due to its pyrophoric properties. Industrial users must comply with occupational safety regulations and environmental protection standards for rare earth metals.

Cerium is available through specialized chemical distributors across Europe, with OYSI serving as a reliable European supplier for industrial customers. Due to its specialized nature and transport requirements, cerium is typically available through established chemical distribution networks rather than general suppliers. Professional buyers should ensure suppliers provide proper documentation, safety data sheets, and comply with ADR transport regulations for safe delivery.