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Chemical name: Nickel(II) chloride hexahydrate
Synonyms: Nickel dichloride hexahydrate, green salt
CAS number: 7791-20-0
Appearance: Bright green crystals that dissolve in water with ease, often used in labs, plating, and a handful of industrial processes.
Odor: No strong scent, so there’s little warning if it’s in the air.
Acute health risks: This salt can cause burns on skin or in eyes. Breathing the dust or mist leads to respiratory tract irritation. Swallowing even a small amount brings nausea, vomiting, and abdominal cramping.
Sensitization: For people who get exposed time and again, nickel compounds trigger allergic skin reactions or worsen asthma.
Carcinogenicity: Nickel compounds rank as known human carcinogens, linked to nose and lung cancer. Crossing safety lines isn’t worth the gamble.
Environmental threat: Spilled solution or dust poisons water, threatening fish and other aquatic life.
Main component: Nickel(II) chloride hexahydrate, about 98–100% purity in typical form.
Impurities: Often tiny traces of other nickel salts and metal oxides, but their impact on overall hazard levels feels minimal in everyday research or manufacturing.
Inhalation: Move outdoors or to fresh air. Breathing issues mean medical attention should happen right away.
Skin contact: Get it off your skin with plenty of water and mild soap. Some people learn too late about their skin sensitivity.
Eye contact: Rinse the eyes with water for many minutes. Vision trouble or pain should send you to an eye doctor.
Ingestion: Don’t induce vomiting. Get professional help, because nickel toxicity isn’t something a home remedy solves.
Flammability: Nickel chloride hexahydrate itself doesn’t burn, but packaging will.
Emissions: Intense heat may create dangerous nickel oxide fumes and hydrogen chloride gas. These can send firefighters to the hospital themselves.
Extinguishing methods: Water spray, foam, or carbon dioxide all work if you’re focused on the material’s surroundings.
Personal precautions: Firefighters suit up with full respiratory gear and water-tight clothing to avoid exposure.
Containment: Cover spills right away to prevent dust. Any granules or powder need gentle cleanup with a disposable towel or wet mop for smaller surfaces.
Protective equipment: Anyone cleaning should wear gloves, goggles, and a dust mask at a minimum.
Environmental care: Prevent the salt or wash water from reaching drains, ditches, or soil. Contaminated water runs straight toward fish or plants in the local ecosystem.
Handling tips: Minimize direct contact with open skin. Avoid creating dust clouds, as inhaling them creates unnecessary risk. Don’t eat or smoke in working areas to keep contamination concerns away from mouths or faces.
Safe storage: Store the crystals in tightly closed plastic or glass jars, away from acids, ammonia, strong bases, and anything incompatible. Cool, dry, and well-ventilated shelves work best.
Children and inexperienced personnel: Only trained adults should handle this compound in a controlled lab or industrial setting.
Workplace limits: The recommended occupational limit for nickel compounds is 0.1 mg/m³, inhaled over an 8-hour time-weighted average.
Ventilation: Engineering controls push air out of workspaces, which makes a real difference for everyone’s lungs. Lab hoods or extraction arms remove airborne dust as it’s generated.
Personal Protective Equipment (PPE): Lab coats, impervious gloves, and safety goggles create a barrier against contact. Workplaces with nickel chloride should provide proper masks or respirators rated for toxic dusts if there’s a risk of inhalation.
Appearance: Translucent green crystals
Solubility: Dissolves rapidly in water, making spills and cleanup more complicated
Odor: Odorless, giving no sensory warning
Melting point: Around 140°C
Density: About 1.92 g/cm³
Decomposition: Will break down if overheated, releasing nickel oxides and hydrogen chloride gas which you really don’t want to breathe.
Persistence: Sticks around in the environment unless specifically treated.
Chemical stability: Stays stable stored in dry, cool conditions in closed containers.
Reactive situations: Mixing or heating with strong bases and oxidizing agents could result in dangerous or unpredictable reactions.
Incompatibles: Acids and ammonia, among others, can bring on unwelcome chemical changes that push safety lower down the list.
Routes of exposure: Skin absorption, inhalation, ingestion, and eye contact all matter.
Short-term exposure: Triggers major skin and eye irritation, as well as stomach pain and vomiting if swallowed.
Long-term exposure: Repeated or prolonged contact leads to skin allergies or chronic respiratory trouble. In occupational settings, higher cancer risk emerges.
Human sensitivity: Many people find out about their nickel allergies at work rather than from jewelry. Handling this compound in a way that avoids all contact proves important.
Aquatic life: Even a tiny amount can harm fish and tiny water bugs.
Persistence and degradability: Nickel chloride sticks around and doesn’t break down quickly, so whether dumped or spilled, it has the potential to travel far and last a long time.
Bioaccumulation: Nickel collects in aquatic organisms, climbing up through the food web; this damages sensitive species who can’t remove nickel from their systems.
Hazardous waste: Nickel chloride counts as hazardous, so never toss it in the regular trash or rinse down the sink.
Collection: Collect waste in well-labeled, compatible containers, and bring in qualified hazardous waste handlers to manage what’s left over.
Regulations: Most places have clear rules for disposal of heavy metals; proper disposal keeps water and soil clean for everyone, not just those working in labs or factories.
Classification: Nickel chloride hexahydrate gets labeled as dangerous goods if shipped by road, air, or sea.
Packing: If the containers aren’t strong and sealed, there’s a risk of leaks or breaks.
Labeling: Transport rules make sure everyone along the way knows this chemical needs careful handling; wrong labeling creates emergencies that spill beyond the cargo bay.
Carcinogen status: Identified as a cancer hazard by health agencies like IARC, so worker protection matters.
Workplace safety: Strict occupational exposure limits set by agencies such as OSHA and ACGIH keep most employees safe if rules are respected.
Environmental laws: Many countries require reporting and risk management plans for nickel compounds, and local water standards demand that industrial wastewater gets treated before it leaves a facility.
Community right-to-know: Laws in the US and elsewhere offer communities information on chemicals held or released by local businesses.
