Phenylmercury Acetate CAS# 62-38-4
Formula: C₈H₈HgO₂
Molar Mass: 336.75 g/mol
Product Classification: Organometallic Compound / Preservative
Appearance: White to off-white, lustrous crystalline powder or prisms. Odorless.
Solubility: Slightly soluble in water (4.37 g/L at 15°C); freely soluble in acetone, acetic acid, alcohol, benzene, and chloroform.
Stability: Stable under normal conditions. Decomposes at 149-150°C. Light-sensitive.
Key Trait: Highly effective biocide (antifungal, antibacterial, spermicidal).
Physical & Chemical Properties
| Property | Value |
|---|---|
| Melting Point | 149 °C (decomposes) |
| Density | 2.58 g/cm³ |
| Vapor Pressure | 0.016 Pa (25°C) |
| Flash Point | 37.8 °C (closed cup) |
| pH (Aqueous Slurry) | Neutral (6-7) |
| Hygroscopicity | Slightly hygroscopic |
Hazard Information (EXTREMELY TOXIC)
WARNING: Class 6.1 Toxic Substance. UN 1674
| Hazard Category | Details |
|---|---|
| Acute Toxicity | Fatal if swallowed, inhaled, or absorbed through skin. (Oral LD₅₀ rat: 41 mg/kg) |
| Corrosivity | Causes severe skin burns and eye damage. |
| Chronic Hazard | Cumulative neurotoxin. Damages nervous system, kidneys, and liver. |
| Environmental | Very toxic to aquatic life with long-lasting effects. |
| Safety Codes (S) | S22, S24, S37, S45, S60, S61 |
| Risk Codes (R) | R25, R26/27/28, R33, R38, R41, R50/53 |
Primary Applications
Agriculture (Historic): Formerly used as a seed treatment fungicide (e.g., 'Ceresan') for rice & wheat. BANNED globally due to toxicity.
Pharmaceuticals: Used as a preservative in eye drops and as a topical antiseptic/spermicide (contraceptive jellies).
Industrial: Preservative for paints, latex, and adhesives. Catalyst for polyurethane.
Laboratory: Disinfectant and preservative for specimens.
Storage & Handling
Store in sealed, light-resistant containers in a cool, dry place.
Strictly separated from food, feed, and pharmaceuticals.
PPE required: Impervious gloves, goggles, respirator. No skin contact.
Regulated: Controlled as a highly toxic chemical by law.
