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Chemical Name: Iron(III) Chloride Common Names: Ferric Chloride Chemical Formula: FeCl3 Appearance: Deep brown-yellow crystalline solid, sometimes showing as a greenish-black lump or flake, with a distinct, pungent odor. Main Uses: Water and wastewater treatment, etching for printed circuit boards, dyeing fabrics, chemical reagent.
Classification: Corrosive to metals and skin, hazardous to eyes, hazardous to aquatic organisms. Main Hazards: Corrosive burns to skin and eyes, severe irritation to mucous membranes, risk of inhalation damage in dust or mist form. Signal Words: Danger Key Health Risks: Contact may burn skin or eyes; inhaling fumes or dust can irritate respiratory system, possibly leading to coughing or difficulty breathing.
Main Ingredient: Iron(III) Chloride (about 97–100 percent purity depending on source and grade). Other Possible Components: Trace amounts of hydrochloric acid, moisture, or iron(II) chloride may be present due to storage or degradation, but ferric chloride forms the bulk.
Skin Contact: Wash thoroughly with running water for at least fifteen minutes; take off contaminated clothing; seek medical attention if irritation persists. Eye Contact: Flush immediately with running water for at least fifteen minutes; hold eyelids open; get prompt medical help. Inhalation: Remove to fresh air without delay; support breathing if needed; consult medical professionals for continued discomfort. Ingestion: Rinse mouth well; do not induce vomiting unless medical personnel direct; never give anything by mouth to an unconscious person; seek urgent medical advice.
Flammability: Iron(III) chloride itself does not burn; may emit corrosive, acidic fumes (like hydrogen chloride) under high heat. Extinguishing Media: Use water spray, dry chemical, or carbon dioxide; avoid strong water jets, which may spread material. Protective Equipment: Firefighters should wear self-contained breathing gear and full chemical-resistant clothing. Special Dangers: Thermal decomposition products can be toxic and include chlorine and iron oxides.
Personal Precautions: Use chemical-resistant gloves, safety goggles, and protective clothing; avoid inhaling dust or fumes. Environmental Precautions: Prevent run-off from entering drains, sewers, or natural water sources as iron(III) chloride can harm aquatic life. Spill Cleanup: Contain spillage with inert absorbent material (such as sand); sweep up and transfer to containers for disposal, washing site with copious water afterward. Avoid Actions: Never let ferric chloride come into direct contact with metals, which might react and speed up corrosion or create dangerous hydrogen gas.
Handling: Work in well-ventilated spaces; always use protective gloves and chemical goggles; avoid skin and eye contact and prevent inhaling dust or mist. Storage: Keep ferric chloride in tightly closed, chemical-resistant containers, away from moisture and incompatible materials such as alkalis and reducing agents; store in a dry, cool, well-ventilated area to reduce risk of corrosive leaks or spills; check frequently for leaks or container corrosion over time.
Engineering Controls: Local exhaust ventilation or fume hoods; eye-wash stations and emergency showers nearby. Personal Protective Equipment: Chemical- and corrosion-resistant gloves, protective eyewear, face shields, long-sleeved lab coats, and closed shoes. Respiratory Protection: Respirators or particulate masks may be needed in case of dust, mist, or poor ventilation. Hygiene Measures: Wash hands thoroughly after handling; remove contaminated clothing and clean before reuse. Occupational Exposure Limits: Strict limit values guide exposure (examples: ACGIH sets threshold at 1 mg/m³ TWA for iron salts as iron—not for every task, but serves as a baseline for safety).
Physical State: Solid, crystalline or powder form, sometimes as flakes Color: Deep yellow to brown Odor: Sharp, acidic, almost metallic Melting Point: About 307°C (depending on hydration) Boiling Point: Sublimation occurs at 315°C Solubility: Highly soluble in water, forming acidic solutions; also reacts with alcohols Vapor Pressure: Negligible (nonvolatile at room temperature) Density: Ranges around 2.9 g/cm³ for anhydrous material.
Chemical Stability: Stable if dry and not exposed to incompatible substances; reacts rapidly with water, producing heat and acidic solutions. Reacts With: Strong alkalis, most metals (corrosive), organic chemicals, reducing agents; produces hydrogen chloride fumes if heated strongly. Hazardous Decomposition Products: Iron oxides, hydrogen chloride, chlorine gas. Other Notes: Containers left open may absorb water from air and cake up or start corroding nearby metals quickly.
Acute Effects: Corrosive to skin, eyes, and internal tissues; ingestion causes nausea, vomiting, abdominal pain, and sometimes bloody diarrhea; inhalation may bring coughing, throat pain, and breathing distress. Chronic Effects: Repeated exposure can lead to skin rashes or thickening, long-term irritation in airways, and possible tooth staining if dust remains present in work areas. Toxic Dose: Oral lethal dose in lab animals varies but is relatively low—high caution needed to avoid swallowing any material. Routes of Exposure: Skin, eye, lung, digestive tract.
Aquatic Risks: Iron(III) chloride poses considerable risk to water-dwelling organisms; can drop pH rapidly and disrupt life cycles in streams and rivers. Soil and Plant Effects: High concentrations alter soil chemistry, hampering plant growth and hurting helpful soil bacteria; improper disposal can build up salts over time. Persistence and Bioaccumulation: Iron salts disperse widely and may linger especially in low-flow waters, causing chronic ecological stress in some cases.
Waste Handling: Avoid pouring unused or spent ferric chloride down drains. Neutralize acidic wastes, dilute well, and collect solids for disposal through licensed hazardous waste companies. Container Disposal: Rinse with plenty of water; destroy or recycle as metal scrap once thoroughly cleaned and dried.
Transport Hazards: Corrosive material classification requires special handling: containers must be sealed and clearly labeled, protected from dampness and physical damage. Vehicle Rules: Vehicles should segregate ferric chloride from food and compatible chemicals; drivers need to know emergency spill procedures. Regulatory Notes: Export, import, and highway shipment may have quantity and packaging restrictions; robust containers and spill kits stay on hand during transit.
Worker Safety: Laws in many countries enforce skin and respiratory protection and restrict exposure time. Most workplaces report their inventory and train staff in ferric chloride hazards. Environmental Rules: Discharge or disposal into water or soil usually requires permits; reporting accidental releases to environmental authorities is common practice in stricter jurisdictions. Labeling: Strong rules apply to label all shipments and containers with hazard symbols and warnings in plain language for quick recognition.
