Tetramine, TETS, DSTA, Dushuqiang, Four-two-four, 424, NSC 172824, Meishuming, Sanbudao
|Molar mass||240.26 g/mol|
|Melting point||255 to 260 °C (491 to 500 °F; 528 to 533 K)|
LD50 (Median lethal dose)
|0.20 mg/kg (mice)|
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
|what is: / ?)(|
Tetramethylenedisulfotetramine (TETS) is an organic compound that is used as a rodenticide (rat poison). It is an odorless, tasteless white powder that is slightly soluble in water, DMSO and acetone, and insoluble in methanol and ethanol. It is a sulfamide derivative. When crystallized from acetone, it forms cubic crystals with a melting point of 255–260 °C.
Toxicity and mechanism
TETS is a neurotoxin, causing lethal convulsions. Its effect is similar to picrotoxin, another cage convulsant. As one of the most hazardous pesticides, it is 100 times more toxic than potassium cyanide. It might be a more powerful convulsant than strychnine. It is a non-competitive GABA antagonist and binds irreversibly to neuronal GABA receptors and disables chloride channels, activating neurons. No antidote is known. The lethal dose for humans is 7–10 mg. Poisoning is diagnosed by gas chromatography and the treatment is mainly supportive, with large doses of benzodiazepines and pyridoxine. It is retained in tissues of poisoned poultry and animals, posing a risk of secondary poisoning.
Continued use in China
Its use worldwide has been banned since 1984, but due to continuing demand and its ease of production, it is still readily, although illegally, available in China and can be found in some illegally imported rat poisons. The best known Chinese rodenticide, containing about 6–20% TETS, is Dushuqiang, "very strong rat poison". It has been used for mass poisonings in China: in April 2004, there were 74 casualties after eating scallion-flavored pancakes tainted by their vendor's competitor; and in September 2002, 400 people were poisoned and 38 died from contaminated food. In 2002, there was one documented case of accidental poisoning in the US.
- Merck Index, 11th Edition, 9158.
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