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Amino-s-triazole

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catalase inhibitor

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A powerful plant growth suppressant and cotton defoliant that is readily absorbed by leaves and roots. 3-Amino-1,2,4-Triazole inhibits many aspects of growth and differentiation including cell division in the primary root meristems in some plants.

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3-Amino-1,2,4-Triazole（Amitrole） is synthesized by condensing formic acid with aminoguanidine and can be purified by recrystallization from methanol.

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Odorless white crystals or white powder. Bitter taste. Melting point 147-159°C. Sublimes undecomposed at reduced pressure. Used as a post-emergence herbicide.

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Water soluble. Aqueous solutions are neutral. Dust may form an explosive mixture in air.

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3-Amino-1,2,4-Triazole is a triazole derivative. The triazoles are a group that contain several derivatives that are highly explosive materials. They are sensitive to heat, friction, and impact. Sensitivity varies with the type substitution to the triazole ring. Metal chelated and halogen substitution of the triazol ring make for a particularly heat sensitive material. Azido and nitro derivatives have been employed as high explosives. No matter the derivative these materials should be treated as explosives. It forms chelates with some metals. 3-Amino-1,2,4-Triazole is corrosive to iron, copper and aluminum. Forms salts with most acids and alkalis. It is incompatible with strong oxidizers, strong acids, acid chlorides and acid anhydrides .

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Toxic; carcinogen.

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Amitrole (3-Amino-1,2,4-Triazole) has low acute toxicity; in experimental animal studies subchronic exposures were associated with changes in the thyroid and chronic exposures were carcinogenic.
Intentional ingestion of a mixture that contained 20 mg/kg amitrole did not cause any signs of intoxication.1 In one reported case study, inhalation of a large amount of amitrolecontaining herbicide was associated with acute toxic reaction of the lungs.2 Lung injury was thought to be secondary to direct toxic damage to the alveolar lining cells. The remarkable lack of any other reports describing pulmonary toxicity of this herbicide was noted, in addition to the presence of other chemicals in the herbicide solution.

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Literature sources indicate that Triazol-3-amine is non-combustible.

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3-Amino-1,2,4-triazole is a non-food use herbicide for control of grasses, woody plants and broad-leaf weeds on hard surface and in areas where crops are not normally grown. It enters plant circulation through roots and is majorly present in the meristem. 3-Amino-1,2,4-triazole inhibits chlorophyll synthesis resulting in chlorotic leaves and albino plants. In addition, it also affects the growth of the plants. It is exploited to destroy unwanted weeds.

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AMITRIL®; ATLAZIN®; ATLAZINE® FLOWABLE; AT®; 3-AT®; AT-90®; ATRAFLOW PLUS®; AZAPLANT®; AZAPLANT KOMBI®; AZOLAN®; AZOLE®; BOROFLOW® A/ATA; CAMPAPRIM® A 1544; CDA SIMFLOW PLUS®; CHIPMAN® PATH; CYTROLE®; DIUROL® AMITROLE; DOMATOL®; ELMASIL®; EMISOL®; FARMCO®; HERBAZIN PLUS SC®; HERBICIDE® TOTAL; MASCOT HIGHWAY®; MSS AMINOTRIAZOLE®; MSS SIMAZINE®; ORGA-414®; RADOXONE® TL; RAMIZOL®; RASSAPRON®; SIMAZOL®; SIMFLOW PLUS®; SOLUTION CNCENTREE T271®; SYNCHEMICALS® TOTAL WEED KILLER; SYNTOX®; TORAPRON®; VOROX®; WEEDAR®; WEEDAZIN®; WEEDAZOL TL ®; WEEDOCLOR®

Safety Profile

Confirmed carcinogen with experimental carcinogenic, tumorigenic, and neoplastigenic data. Poison by intraperitoneal route. Moderately toxic by ingestion. An experimental teratogen. Other experimental reproductive effects. Mutation data reported. When heated to decomposition it emits toxic fumes of NOx,. An herbicide and plant growth regulator

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A potential danger to those involved in the manufacture, formulation, and application of this postemergence herbicide, which is now limited to noncrop applications as a herbicide and plant growth regulator. Some triazoles have been used as rubber components.

Carcinogenicity

Amitrole is reasonably anticipated to be a human carcinogen based on sufficient evidence of carcinogenicity from studies in experimental animals.

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Soil. When radiolabeled amitrole-5-14C was incubated in a Hagerstown silty clay loam, 50 and 70% of the applied amount evolved as 14CO2 after 3 and 20 days, respectively. In autoclaved soil, however, no 14CO2 was detected. The chemical degradation in soil was probably via hydroxyl radicals (Kaufman et al., 1968). The average persistence in soils is 2–4 weeks (Hartley and Kidd, 1987)
Plant.Amitrole is transformed in plants to form the conjugate β-(3-amino-1,2,4-triazol- 1-yl)-α-alanine (Humburg et al., 1989) and/or 3-(3-amino-s-triazole-1-yl)-2-aminopropionic acid (Duke et al., 1991). Amitrole is metabolized in Canada thistl
Surface Water. In pond water, adsorption to suspended sediments was an important process. The initial half-life was reported to be no more than 68 days. After 120 days, 20% of the applied amount remained (Grzenda et al., 1966). The biodegradation
Photolytic. Direct photolysis of amitrole is not expected to occur since the herbicide shows little or no absorption greater than 295 nm (Gore et al., 1971)
Chemical/Physical. Reacts with acids and bases forming soluble salts (Hartley and Kidd, 1987). Emits toxic fumes of nitrogen oxides when heated to decomposition (Sax and Lewis, 1987); however, incineration with polyethylene results in more than 9

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UN2588 Pesticides, solid, toxic, Hazard Class: 6.1; Labels: 6.1-Poisonous materials, Technical Name Required. UN3077 Environmentally hazardous substances, solid, n.o.s., Hazard class: 9; Labels: 9-Miscellaneous hazardous material, Technical Name Required.

Purification Methods

It crystallises from EtOH (charcoal), then three times from dioxane [Williams et al. J Phys Chem 61 261 1957]. [Beilstein 26 H 137.] Possible carcinogen. [Beilstein 26 H 137, Temple & Montgomery 1,2,4-Triazoles —The Chemistry of Heterocyclic Compounds Vol 37 (Weissberger & Taylor eds.). Wiley & Sons NY 1981, ISBN 0-471-0656-6.]

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Dust may be explosive in air. Keep away from strong oxidizers; strong acids; light and heat (decomposes). Corrosive to iron, aluminum, and copper. Sublimes undecomposed at reduced pressure.

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Consult with environmental regulatory agencies for guidance on acceptable disposal practices. Generators of waste containing this contaminant (≥100 kg/mo) must conform with EPA regulations governing storage, transportation, treatment, and waste disposal. Amitrol is resistant to hydrolysis and the action of oxidizing agents. Burning the compound with polyethylene is reported to result in .99% decomposition.

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[1] SERGEY M. DESENKO. Cyclecondensation of 3-amino-1,2,4-triazole with substituted methyl cinnamates[J]. Journal of Heterocyclic Chemistry, 2009, 36 1: 205-208. DOI:10.1002/jhet.5570360131. 
[2] XIAOTAO LIU . 3-Amino-1,2,4-triazole-derived graphitic carbon nitride for photodynamic therapy[J]. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2021, 250: Article 119363. DOI:10.1016/j.saa.2020.119363.

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