Arsenic

Arsenic is a chemical element with the symbol As and atomic number 33, classified as a metalloid. It has a molecular weight of 74.92159 g/mol and is found naturally in the earth's crust. Arsenic is highly toxic to humans and animals, classified under acute toxicity category 3. It appears in various forms including gray metallic arsenic, yellow arsenic, and black arsenic, with different physical properties depending on the allotrope.

Arsenic exists in several allotropic forms with varying physical properties. Gray arsenic (metallic form) is the most stable, appearing as a steel-gray, brittle solid with metallic luster. It has a density of 5.73 g/cm³ and sublimes at 613°C without melting. Yellow arsenic is soft and waxy, while black arsenic is brittle. Arsenic is insoluble in water but soluble in nitric acid and forms various compounds with different solubility characteristics.

Arsenic is primarily used in the semiconductor industry for producing gallium arsenide compounds used in electronic devices, solar cells, and LEDs. It serves as a doping agent in semiconductor manufacturing and is utilized in specialized alloys to improve hardness and heat resistance. Historically used in pesticides and wood preservatives, these applications have been largely phased out due to toxicity concerns. Some arsenic compounds are still used in veterinary medicine and glass manufacturing.

Arsenic requires extreme caution due to its high toxicity and classification as Acute Tox. 3 with danger signal word. Essential protective equipment includes respiratory protection (P2/P3 filters), chemical-resistant gloves, protective clothing, and safety goggles. Work in well-ventilated areas or under fume hoods. Avoid dust formation and prevent skin contact. Wash hands thoroughly after handling and never eat, drink, or smoke in work areas. Regular health monitoring is recommended for occupational exposure.

Arsenic must be stored in tightly sealed, labeled containers in a cool, dry, well-ventilated area away from incompatible materials. Keep away from acids, oxidizing agents, and reactive metals. Storage areas should be secure with restricted access due to toxicity concerns. Maintain temperatures below 25°C and protect from moisture and physical damage. Secondary containment is recommended, and storage areas must comply with local regulations for toxic substances and have appropriate emergency response equipment available.

Arsenic exposure requires immediate medical attention due to its high toxicity. For skin contact, remove contaminated clothing and wash affected area with soap and water for at least 15 minutes. If inhaled, move to fresh air immediately and seek medical care. For eye contact, rinse with water for 15 minutes. If ingested, do not induce vomiting and seek emergency medical treatment immediately. Always contact poison control centers and inform medical personnel about the specific arsenic compound involved.

Arsenic disposal must comply with hazardous waste regulations due to its classification as Acute Tox. 3 and aquatic toxicity. Contact licensed hazardous waste disposal companies for proper treatment and disposal. Never dispose of arsenic in regular trash, sewers, or environment. Small quantities should be collected in appropriate containers and labeled clearly. Disposal methods typically involve stabilization and secure landfill disposal or specialized treatment. Maintain disposal records and follow local, national, and EU waste management regulations.

Arsenic is classified under ADR Class 6.1 (toxic substances), Packing Group II, requiring specific transport procedures. It must be packaged in UN-approved containers with proper labeling including GHS06 (skull and crossbones) and GHS09 (environment) pictograms. Transport documents must include proper shipping names, hazard class, and emergency contact information. Drivers require ADR training and vehicles need appropriate placarding. Segregation from food, feed, and incompatible materials is mandatory during transport.

Arsenic is heavily regulated under multiple frameworks including REACH regulation, CLP classification, and various national restrictions. It's classified with GHS pictograms GHS06 and GHS09, requiring specific labeling and safety data sheets. Many arsenic compounds face restrictions or bans in consumer products. Occupational exposure limits are strictly regulated, and workers require health surveillance. Environmental discharge is controlled under water and waste regulations. Import/export may require permits, and some applications are prohibited or restricted across EU member states.

Arsenic is available through specialized chemical distributors like OYSI, which serves the European market with technical-grade chemicals. Due to its high toxicity classification and regulatory restrictions, purchases typically require business licensing, end-use declarations, and compliance with local regulations. OYSI can provide proper documentation, safety data sheets, and regulatory guidance for legitimate industrial applications. Contact OYSI directly to discuss specific requirements, quantities, and compliance procedures for arsenic procurement in your region.