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Chemical name: Cadmium Telluride
Common uses: Thin-film solar cells, photovoltaic modules, semiconductor applications
Physical form: Usually appears as black to dark gray crystalline powder or solid
Odor: Odorless
Molecular formula: CdTe
Molecular weight: 240.00 g/mol
Health hazards: Inhalation or ingestion exposes the body to cadmium, known for its acute and chronic toxicity—with prolonged exposure linked to kidney damage, lung inflammation, and a risk of cancer. The telluride component does not get a free pass, as it can release toxic tellurium compounds.
Physical hazards: Not flammable, but heating leads to breakdown and possible fume generation.
Environmental hazards: Cadmium spreads easily through soil and water, remains persistent, and endangers wildlife, especially aquatic animals.
Main components: Cadmium (Cd) and Tellurium (Te) chemically bound
Typical concentration: Usually above 99% purity for industrial applications, rarely cut with significant impurities
Inhalation: Remove affected person from exposure into fresh air, get medical evaluation for cough, shortness of breath, or chest pain. Serious symptoms should be met with emergency medical attention.
Skin contact: Wash thoroughly with soap and water, strip contaminated clothing, monitor for irritation or burns.
Eye contact: Rinse cautiously with water for several minutes, seek care if burning, irritation, or vision changes persist.
Ingestion: Avoid inducing vomiting, rinse mouth, and obtain immediate medical assessment.
Sensitivity to fire: The compound itself does not ignite, yet breakdown products—especially cadmium and tellurium oxides—are hazardous.
Suitable extinguishing agents: Water mist, dry chemical, carbon dioxide, or foam depending on nearby materials.
Fire-specific hazards: Firefighters should expect toxic fumes and should use full protective gear and self-contained breathing apparatus to avoid respiratory danger.
Personal precautions: Anyone involved should strap on gloves, chemical-resistant clothing, and respiratory protection since dust or fumes put lungs at risk.
Environmental precautions: Any spill—no matter the volume—should be contained as quickly as possible to prevent wind or rain from spreading contamination.
Cleanup methods: Powder and particles should be swept up gently with damp tools and placed in sealed containers; vigorous cleanup that stirs dust raises exposure.
Handling practices: Only those trained to respect cadmium toxicity should process or transfer this material; avoid eating, drinking, and touching the face during handling.
Storage recommendations: Secure in tightly closed containers, placed in designated chemical storage rooms with good ventilation and away from acids or oxidizers.
Precautions: Clear labelling and secure access reduce the chance of casual or mistaken contact by uninformed individuals.
Engineering controls: Fume hoods, negative pressure workspaces, and filtered local exhausts keep airborne levels in check.
Personal protective equipment: Rubber or nitrile gloves, lab coats or chemical aprons, and approved particulate or chemical respirators based on the potential for dust or vapor exposure.
Hygiene practices: Regular handwashing and strict ban on storing food or drink where the chemical is used keep accidental exposure low.
Appearance: Black or dark gray crystalline solid or powder
Melting point: About 1092°C
Solubility: Nearly insoluble in water
Odor: No odor
Density: 5.85 g/cm³ (approximate value)
Stability: Stable under ordinary conditions as long as it stays cool and dry, but heat and strong acids drive it to break down.
Chemical stability: Stable at room temperature under dry conditions.
Decomposition: High heat, open flame, or contact with acids generates cadmium and tellurium oxides, which put people and the local environment at risk.
Reactivity hazards: Vigorous reactions when mixed with oxidizers, acids, and some metals.
Exposure pathways: Inhalation, ingestion, and skin contact all offer chances for harm.
Key symptoms: Damage to kidneys and liver with chronic exposure, lung damage with acute inhalation, and risk for cancer as classified by international agencies.
Long-term effects: Cadmium sets up shop in the body and does not leave easily, so repeated low doses build up over years bringing chronic illness.
Persistence and bioaccumulation: Cadmium does not break down in the environment; over time, accumulates in soils, lakes, rivers, and living things.
Effects on wildlife: Elevated levels interfere with fish, invertebrates, and plants, leading to lower survival rates and stunted growth.
Transport in environment: All forms, from powders to fragments, move easily with surface water and wind, making widespread contamination tough to clean up.
Waste management: Treated as hazardous waste under most health and environmental laws.
Methods: Professional hazardous waste contractors handle storage, transport, and final treatment—landfilling is rare and incineration is strictly regulated.
Precautions: Communication down the disposal chain keeps materials out of municipal landfills, water systems, and casual recycling channels.
Shipping classification: Dedicated hazardous materials regulations control how cadmium compounds travel within and across borders.
Packaging: Only robust, leak-tight containers meet compliance—any mistake can lead to spills en route.
Labeling and documentation: Proper hazard labeling, recordkeeping, and driver training prevent mishaps and streamline emergency response.
Worker protections: Occupational exposure limits in many countries mandate regular air monitoring and health checks for those working with any cadmium material.
Environmental regulation: Strict reporting rules under environmental laws (like the U.S. EPA and European REACH), with criminal and civil penalties for mishandling, unlawful discharge, or contamination.
Product restrictions: Growing international attention means use gets scrutinized in solar panels and electronics, encouraging new recycling and safer alternatives.
