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Chemical Name: Lithium Dichromate
Synonyms: Dichromic acid, dilithium salt; Dilithium dichromate
CAS Number: 14307-35-8
Recommended Use: Laboratory reagent, oxidizing agent
Manufacturer/Supplier: Refer to packaging for manufacturer or distributor information
Emergency Phone Number: Provided on the product label or packaging
GHS Classification: Oxidizing solid (Category 2), Acute toxicity oral (Category 3), Acute toxicity dermal (Category 3), Acute toxicity inhalation (Category 2), Skin corrosion/irritation (Category 1C), Serious eye damage/eye irritation (Category 1), Germ cell mutagenicity (Category 1B), Carcinogenicity (Category 1A), Specific target organ toxicity repeated exposure (Category 1), Hazardous to the aquatic environment—acute and chronic (Category 1)
Signal Word: Danger
Hazard Statements: Toxic if inhaled, ingested, or absorbed through skin. Causes severe skin burns and eye damage. May cause cancer by inhalation. Causes damage to organs through prolonged or repeated exposure. Very toxic to aquatic life.
Pictograms: Health hazard, corrosive, skull and crossbones, exclamation mark, aquatic toxicity, oxidizing flame over circle
Precautionary Statements: Avoid release to environment. Wear protective gloves, safety goggles, and respiratory protection. Wash thoroughly after handling. Use only outdoors or in a well-ventilated area. Do not breathe dust or fume.
Substance: Lithium Dichromate
Chemical Formula: Li2Cr2O7
Molecular Weight: 254.00 g/mol
Percents of Constituents: Lithium dichromate content 98% or higher by weight, trace impurities may include sodium dichromate, potassium compounds
Other Components: No stabilizers or additives present in pure product
Inhalation: Move person to fresh air. If breathing is labored or stops, begin artificial respiration and seek immediate medical attention. Call poison center or doctor.
Skin Contact: Immediately remove contaminated clothing. Flush skin with large amounts of running water for at least 15 minutes. Get immediate medical attention.
Eye Contact: Rinse with plenty of water for at least 15 minutes, lifting upper and lower eyelids occasionally. Remove contacts if present and easy to do. Seek immediate medical attention.
Ingestion: Do not induce vomiting. Rinse mouth thoroughly. Never give anything by mouth to an unconscious person. Seek immediate medical assistance.
Most Important Symptoms and Effects: Severe irritation, tissue destruction, signs of poisoning such as nausea, vomiting, abdominal pain, coughing, labored breathing, chemical burns to skin/eyes.
Suitable Extinguishing Media: Use water spray, fog, or flooding quantities of water. Do not use dry chemicals or carbon dioxide.
Specific Hazards Arising from Chemical: Strong oxidizer. Can intensify fire. Decomposes on heating, releasing toxic and corrosive fumes including chromium oxides and lithium oxide.
Protective Equipment: Wear self-contained breathing apparatus and fully protective clothing.
Firefighting Instructions: Keep containers cool with water spray. Evacuate area. Avoid contact with steam or fumes.
Personal Precautions: Evacuate unnecessary personnel. Use appropriate personal protective equipment including gloves, protective clothing, eye protection, and approved respirator.
Environmental Precautions: Prevent further leakage or spillage if safe to do so. Do not allow chemical to enter sewers, waterways, or soil.
Methods for Cleaning Up: Sweep up carefully to avoid raising dust. Place material into a suitable, labeled container for disposal, using non-sparking tools. Wash area with plenty of water after material pickup. Ventilate area.
Handling Precautions: Use only in a chemical fume hood or with local exhaust ventilation. Avoid contact with skin, eyes, and clothing. Avoid inhaling dust. Do not eat, drink, or smoke when using this product. Wash hands and face thoroughly after handling.
Storage Conditions: Store in a tightly closed container. Keep in a cool, dry, well-ventilated area away from incompatible materials such as organic materials, reducing agents, acids, and combustibles. Do not store near food or beverages. Keep away from moisture and sources of ignition.
Occupational Exposure Limits: OSHA PEL for Chromium (VI) compounds: 0.005 mg/m³ (as Cr (VI)), ACGIH TLV: 0.01 mg/m³ (as Cr (VI)).
Engineering Controls: Use ventilation such as chemical fume hoods to control airborne exposure. Eye wash stations and safety showers recommended.
Personal Protective Equipment: Chemical-resistant gloves, impervious clothing, tightly fitting safety goggles, face shield, and a NIOSH-approved respirator are necessary where dust or fumes may be present.
Hygiene Measures: Do not touch face or rub eyes during handling. Remove contaminated clothing and wash before reuse.
Appearance: Orange-red crystalline solid
Odor: Odorless
pH: Weakly acidic (in aqueous solution)
Melting Point: Decomposes above 400 °C
Boiling Point: Not applicable (decomposes before boiling)
Solubility in Water: Moderate (soluble in cold water, higher in hot water)
Density: 2.35 g/cm³
Vapor Pressure: Not applicable
Flash Point: Not flammable
Partition Coefficient (n-octanol/water): Not determined
Evaporation Rate: Not applicable
Chemical Stability: Stable under recommended storage conditions. Decomposes on exposure to heat or acids with release of toxic vapors.
Incompatible Materials: Strong reducing agents, organic materials, combustible substances, acids, ammonium salts.
Hazardous Decomposition Products: Chromium oxides, lithium oxide, and other toxic metal fumes.
Conditions to Avoid: Heat, flames, moisture, shock, contamination with organic or combustible materials.
Routes of Exposure: Inhalation, ingestion, skin and eye contact.
Acute Toxicity: Highly toxic by all routes of exposure. LD50 oral (rat): ~20-40 mg/kg.
Chronic Effects: Prolonged or repeated exposure can damage kidneys, liver, respiratory and reproductive organs. May cause cancer.
Carcinogenicity: Classified by IARC as Group 1 (Carcinogenic to humans) due to hexavalent chromium content.
Symptoms: Burning, ulceration of exposed tissues, systemic toxicity, headache, dizziness, cough, breathlessness.
Sensitization: May cause allergic skin reactions. Potential for sensitization by skin contact or inhalation.
Aquatic Toxicity: Very toxic to aquatic life with long-lasting effects. Chromate compounds remain stable in water and are highly persistent.
Environmental Fate: Not readily biodegradable. May bioaccumulate in aquatic organisms.
Mobility in Soil: Mobile in soil and ground water due to solubility. Can travel long distances, posing a risk to drinking water supplies.
Ecotoxicological Data: Acute LC50 for fish: < 1 mg/L (chromium VI compounds).
Waste Disposal Methods: Treat as hazardous waste in accordance with local, regional, national, and international regulations. Place waste in properly labeled containers and dispose through licensed hazardous waste contractor.
Precautions: Do not pour down drains or release to the environment. Consider recovery and recycling if possible.
Contaminated Packaging: Triple-rinse containers and dispose of as hazardous waste.
UN Number: UN 3288
Proper Shipping Name: Toxic solid, inorganic, n.o.s. (contains lithium dichromate)
Transport Hazard Class: 6.1 (Toxic substances)
Packing Group: II
Labels / Placards: Toxic, environmentally hazardous substance, oxidizer
Transportation Requirements: Secure packaging. Keep separate from foodstuffs and incompatible materials. Special documentation required.
US Regulations: Listed under CERCLA, SARA Title III Section 313 (Chromium VI compounds). Subject to OSHA Process Safety Management. Regulated under TSCA.
EU Regulations: Subject to REACH regulation (SVHC - Substances of Very High Concern). Requires workplace exposure controls under COSHH.
Other International Regulations: Controlled under Canadian WHMIS (Class D1A, D2A, D2B, E), Australian Hazardous Chemical Schedule, Japanese Chemical Substances Control Law. Strictly regulated in most jurisdictions due to carcinogenicity and high aquatic toxicity.
Label Requirements: GHS/CLP-compliant pictograms, hazard, and precautionary statements required.
