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Substance: Cadmium (elemental, non-pyrophoric) Common Forms: Soft, bluish-white metal, often encountered in blocks, rods, or occasionally as coarse powder Intended Use: Alloys, batteries, coatings, pigments, and electronic components, reflecting widespread industrial presence Appearance and Odor: No distinct odor, metallic sheen with slight luster, density and softness noteworthy CAS Number: 7440-43-9 Other Names: Naturally occurring as greenockite, utilized in several manufacturing sectors Workplace Relevance: Anyone in welding, soldering, recycling, or coating industries often finds themselves near cadmium materials, occasionally without knowing the full risk involved
Acute Health Hazards: Inhalation produces significant lung and respiratory irritation, chest pain, shortness of breath, and throat discomfort; ingestion is rare but can damage kidneys and liver Chronic Health Hazards: Regular exposure builds up in kidneys, association with kidney failure, bone fragility, developmental effects, cancer; long-term issues include anemia and immune suppression Routes of Exposure: Inhalation stands as the primary risk in workplaces, followed by dermal contact when dealing with dust or powders Physical Hazards: Not pyrophoric, stable under common conditions, but dust can collect, and airborne particles remain a concern OSHA Regulatory Status: Labels as a human carcinogen; exceeding PEL mandates engineering controls and medical monitoring Signal Word: Danger; not a substance to take lightly, even if handled in solid block form
Main Component: Cadmium, metallic form, purity usually above 99% in industrial use Impurities: Small quantities of zinc, lead, or other trace heavy metals found depending on the mining or refining source Mixtures: Often occurs as base material; if alloyed, hazards shift depending on the secondary metal content
Inhalation: Remove the person to fresh air, seek immediate medical attention in cases of cough, chest tightness, throat swelling, or breathing difficulty; oxygen assistance recommended Skin Contact: Take care to scrub thoroughly with plain soap and running water, discard contaminated clothing, watch for irritation or rashes Eye Contact: Rinse immediately with clean water, holding eyelids open for several minutes; if irritation persists or vision blurs, get professional help Ingestion: Never induce vomiting; rinse mouth and get prompt medical evaluation, as cadmium can cause multi-organ damage quickly Notes for Medical Personnel: Supportive care and removal from exposure; monitor for delayed pulmonary edema or gastrointestinal effects
Suitable Extinguishing Media: Use standard agents (dry chemical, carbon dioxide, foam); water spray only to cool containers, avoid contact with molten metal Specific Hazards: Fire rarely starts from cadmium itself, but surrounding combustible materials or fine dust in air can burn rapidly Toxic Gases: Burning cadmium releases highly toxic cadmium oxides, which pose a serious inhalation hazard for firefighters Protective Equipment: Full protective clothing with self-contained breathing apparatus essential during firefighting Advice for Evacuators: Clear area quickly, avoid smoke or vapor
Personal Precautions: Never sweep, use a HEPA vacuum or wet cleanup; prevent spread of dust Environmental Considerations: Prevent entry into drains, waterways, soil — heavy metal remains persistent and can contaminate groundwater for decades Cleanup Process: Collect into sealed containers for hazardous waste disposal, label and track movement Risk Communication: Inform workers immediately, post warnings and restrict access to contaminated areas
Safe Handling: Minimize dust generation, handle with gloves and lab coats or coveralls; never eat, drink, or smoke in work areas Use Recommendation: Only perform high-temperature operations in controlled ventilation (fume hoods or local exhaust), as heating releases dangerous fumes Storage: Keep in dry, cool, and well-ventilated areas in tightly sealed containers, separate from food, acids, and oxidizers; monitor for spills or corrosion Spill Response: Train staff and keep emergency equipment ready
Permissible Exposure Limits: OSHA PEL remains at 0.005 mg/m³ as an 8-hour TWA for respirable fraction, which demonstrates risk at extremely low airborne concentrations Engineering Controls: Local exhaust ventilation, process enclosure, wet methods, and negative-pressure rooms used to keep airborne dust negligible Protective Equipment: Respirators (at minimum NIOSH-approved P100 filters, sometimes supplied-air if higher risk), chemical-resistant gloves, eye protection Hygiene Measures: Wash hands and face before breaks, change out of work clothes before leaving; periodic medical surveillance for anyone at risk
Appearance: Silvery-bluish metal, soft and easily scratched Melting/Boiling Point: Melting at 321°C, boils at 765°C, vaporizes easily at high heat Density: Around 8.65 g/cm³ Solubility: Insoluble in water, reacts with strong acids to form soluble toxic salts Odor Threshold: No noticeable odor at hazardous concentrations Other Properties: Good electrical conductivity explains its role in electronics, but also adds risk in scrap or recycling operations
Chemical Stability: Stable at ambient temperature and humidity; surface tarnishes slowly in moist air Hazardous Decomposition: High-temperature operations (>500°C) release cadmium oxide fumes, which produce serious health effects at minute concentrations Material Incompatibility: Strong oxidizers, mineral acids, ammonia, causing violent reactions or toxic by-products Other Reactions: Gradual corrosion in acidic or alkaline environments; reacts with halogens
Acute Effects: Short exposure can cause severe lung damage (metal fume fever) and gastrointestinal irritation Chronic Effects: Prolonged exposure linked directly to kidney damage, fragile bones (Itai-Itai disease), pulmonary emphysema, cancer (especially lung and prostate), impaired fertility Sensitization: Some individuals develop allergic contact dermatitis Carcinogenicity: Listed by IARC and NTP as known human carcinogen, with established links in occupational studies Most Vulnerable: Smokers, workers with preexisting kidney or lung conditions
Persistence and Mobility: Cadmium accumulates in soil and sediments, resistant to breakdown, moves slowly but contaminates large areas over time Toxicity to Wildlife: Aquatic species extremely sensitive, cadmium stunts growth, causes reproductive defects, builds up in the food chain; birds and fish suffer chronic poisoning Bioaccumulation: Living organisms concentrate cadmium in tissues, which then passes up the food web, ultimately reaching people Impact of Spills: Runoff from factories or improper disposal leads to water body contamination, long recovery times
Disposal Method: Send to licensed hazardous waste facility, melting or incineration strictly prohibited without special filtration due to toxic emissions Container Handling: Use corrosion-proof, sealed barrels or canisters, label as hazardous and maintain a manifest for regulatory tracking Minimizing Waste: Recycle where possible, but only at facilities equipped to recapture vaporized cadmium Avoidance: Never deposit in regular landfill, as groundwater contamination persists for generations
Regulatory Classification: Listed as hazardous under DOT and international shipping codes; special labeling and paperwork needed Packing: Must use inner and outer packaging that resists leakage and accidental exposure, cushioning prevents breakage Accident Protocols: In transit, vehicles carry emergency guides and cleanup kits for immediate response
Key Standards: OSHA, EPA, IARC, and various international agencies set strict limits due to disease risk and environmental persistence Worker Rights: Mandates workplace monitoring, hazard communication, exposed worker medical surveillance, and training for handling and spill response Environmental Controls: Discharge and emission limits monitored, permits required for disposal, reporting for any release above threshold quantities Restricted Use: Many regions restrict nonessential cadmium applications, supporting the phasing out of older uses
