Chemical Class and Phosphine Gas Toxicity
Zinc Phosphide (Zn3P2) is an acute inorganic single-dose rodenticide. Upon ingestion by rodents, it reacts with gastric hydrochloric acid in the stomach to release toxic phosphine gas (PH3).
Phosphine gas is absorbed rapidly into the bloodstream, where it inhibits cytochrome c oxidase within cellular mitochondria, arresting cellular respiration and inducing severe pulmonary edema, cardiac arrest, and death within 2 to 6 hours.
- Fast-Acting Acute Toxicant: Single-dose consumption triggers rapid mortality within 2 to 6 hours.
- Phosphine Gas Liberation: Chemical reaction with stomach acid halts cellular respiration.
- Formulation Types: Available as ready-to-use paste, tracking powders, or technical mixing powder.
Pre-Baiting Technique and Field Application
Rodents are naturally suspicious of new food sources (neophobia). If an unacclimated rat consumes a sub-lethal dose of Zinc Phosphide, it experiences rapid discomfort and develops permanent 'bait shyness', refusing to touch the poison again.
To prevent bait shyness, farmers must conduct pre-baiting for two consecutive days using unpoisoned roasted grain or bread mixed with edible oil in active burrows. On the third day, the Ratol poison bait is placed deep inside live burrows and sealed with wet earth.
- Pre-Baiting Mandate: Place plain food bait for two days to establish rodent feeding confidence.
- Bait Placement: Insert toxic bait deep into active, newly opened burrows and pack openings with soil.
- Storage Godown Care: Place bait stations along perimeter walls where rodents habitually run.
Safety Protocols and Non-Target Protection
Because Zinc Phosphide is an acute poison with high toxicity to humans, livestock, and pets, strict safety precautions must be followed. Operators must wear rubber gloves during bait preparation and never touch bait directly with bare hands to avoid transferring human scent.
There is no specific chemical antidote for Zinc Phosphide poisoning; emergency medical intervention requires immediate gastric lavage with sodium bicarbonate or potassium permanganate. All uneaten bait and rodent carcasses must be buried deeply.
- Tamper-Resistant Placement: Never leave open bait accessible to cattle, poultry, dogs, or children.
- Deep Carcass Burial: Collect and bury dead rodents deeply to prevent secondary poisoning of raptors and scavengers.
- Emergency Medical Protocol: Immediately transport accidental ingestion cases to the nearest hospital for stomach lavage.
Official source
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Central Insecticides Board & Registration Committee (CIBRC) ↗Related on KisanPe
Common questions
What is the active chemical in Ratol rodenticide?
Ratol contains Zinc Phosphide, an acute fast-acting inorganic rodent poison.
Why is pre-baiting necessary when using Ratol?
Pre-baiting with unpoisoned grain overcomes rodents' natural suspicion, ensuring they consume a lethal dose and preventing bait shyness.
Is there a specific medical antidote for Zinc Phosphide poisoning?
No, there is no specific chemical antidote; emergency treatment involves immediate hospital gastric lavage with sodium bicarbonate.
General guidance, not personal advice. For your farm, ask your local Krishi Vigyan Kendra or agriculture officer.
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