Chemical nature and lethal phosphine gas generation
Sulphas tablets are composed of Aluminium Phosphide (typically 56% active) mixed with ammonium carbamate and inert binders.
When exposed to ambient air and atmospheric humidity, it undergoes a chemical reaction that liberates phosphine gas (PH3). Phosphine is a colorless, highly toxic, flammable gas with a characteristic decaying fish odor that eliminates all life stages of stored-grain insect pests through cellular respiration arrest.
- Active chemical: Aluminium Phosphide (56% formulation releasing phosphine gas).
- Mechanism of toxicity: Phosphine binds to cytochrome c oxidase in mitochondrial electron transport, causing immediate cellular energy collapse and multi-organ failure.
- Professional-only use: Strictly restricted by the Government of India for certified professional grain warehouse fumigation; retail OTC sale is prohibited.
Statutory regulatory restrictions and storage safety
Under the Insecticides Act, 1968, the sale, distribution, and possession of Aluminium Phosphide are severely restricted to government agencies and licensed pest control operators.
Tablets must never be utilized in open domestic dwellings, residential kitchens, or unsealed farm rooms where escaping gas causes fatal human poisoning.
- Airtight enclosures only: Must be applied only in certified gas-tight fumigation covers, airtight steel silos, or sealed warehouses.
- Air monitoring: Operators must utilize calibrated phosphine gas detectors before entering fumigated premises.
- Storage security: Must be stored in original sealed aluminium flasks locked in secure, fire-proof, detached chemical stores.
Emergency hazards, lack of specific antidote, and clinical care
Aluminium phosphide ingestion or inhalation is a catastrophic medical emergency with high clinical mortality, as there is no specific medical antidote.
Immediate medical hospital management requires rapid gastric lavage, continuous supportive resuscitation, and intensive cardiac care under qualified toxicologists.
- No antidote: Medical science has no specific pharmacological antidote; treatment is entirely supportive and intensive.
- Immediate hospital transfer: Immediately transport the victim to an advanced tertiary hospital with intensive care facilities.
- First aid: Remove victim to fresh air; do not induce vomiting with water as moisture accelerates phosphine gas release in the stomach.
Official source
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Central Insecticides Board & Registration Committee ↗Related on KisanPe
Common questions
What is Sulphas (Aluminium Phosphide) used for legally in India?
It is legally restricted exclusively for professional grain fumigation in airtight silos, warehouses, and Food Corporation of India godowns.
Why is Aluminium Phosphide so hazardous?
It reacts with atmospheric moisture to release phosphine gas, which causes fatal cellular energy shutdown with no known medical antidote.
Can farmers buy Sulphas tablets over the counter?
No, retail sale of Aluminium Phosphide is strictly restricted by government regulations to certified pest control operators and government grain handlers.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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