Essential details
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Product Introduction
| Parameter | Details |
|---|---|
| Chemical Name | Ammonium Thiosulfate |
| CAS Number | 7783-18-8 |
| Molecular Formula | (NH₄)₂S₂O₃ |
| Molecular Weight | 148.20 g/mol |
| Physical Appearance | Colorless to pale yellow crystalline powder; Hygroscopic |
| Melting Point | 150 °C (decomposes upon heating) |
| Solubility | Highly soluble in water; Slightly soluble in ethanol; Insoluble in ether |
| pH Value | 6.0–7.5 (10% aqueous solution) |
| Chemical Properties | Stable under neutral/weakly alkaline conditions; Decomposes in acidic media to release sulfur dioxide and sulfur; Reacts with heavy metal ions to form insoluble thiosulfates |
| Primary Applications | 1. Agriculture: Nitrogen-sulfur fertilizer (provides both N and S for crops); Reduces nitrification of urea; Prevents iron deficiency in plants2. Photography: Fixing agent in film processing (removes unexposed silver halides)3. Water Treatment: Oxygen scavenger for boiler water; Reducing agent for removing chlorine4. Chemical Industry: Precursor for thiosulfate salts; Analytical reagent for iodometric titrations |
| Safety & Hazards | - Low acute toxicity; Non-irritating to skin and eyes under normal use- Inhalation of dust may cause mild respiratory irritation- Avoid contact with strong acids (releases toxic SO₂ gas) |
| Storage Requirements | Store in airtight containers in a cool, dry, well-ventilated area; Protect from moisture and direct sunlight; Separate from acids, oxidizers, and heavy metal compounds |
| Regulatory Notes | Approved as agricultural fertilizer in most countries; Complies with EPA and EU fertilizer regulations; No special transportation restrictions for non-bulk quantities |
