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  • 5-Carboxy-2-amino-1,3,4-triazole
  • 3-Amino-5-carboxy-1,2,4-triazole
  • 5-Amino-s-triazole-3-carboxylic acid
  • 3-Amino-1,2,4-triazole-5-carboxylic acid
  • 5-Amino-1H-1,2,4-triazole-3-carboxylic acid
FormulaC3H4N4O2.0.5H2O (C3H4N4O2)
Description Off-white powder.

Registry Numbers and Inventories.
EC Risk PhraseR:36/37/38
EC Safety PhraseS:26-36
ENCS (MITI) 5-610
Beilstein ref.5-26-10-00266
Listed on the Toxic Substancs Control Act (TSCA).
Listed on Canadian Non-Domestic Substances List (NDSL).

Formula mass137.09
Melting point, °C186
Vapor density (air=1)4.7
Solubility in waterVery soluble
Acid/Base8.92 (pKb)

Hazards and Protection.
Storage Keep container closed when not in use. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation.
Protection Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks Clean up spills immediately, using the appropriate protective equipment. Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions. Provide ventilation.
Stability Stable under normal temperatures and pressures.
Incompatibilities Oxidizing agents.
Decomposition Nitrogen oxides, carbon monoxide, irritating and toxic fumes and gases, carbon dioxide, nitrogen.

Fire fighting Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Vapors may be heavier than air. They can spread along the ground and collect in low or confined areas. Extinguishing media: Use agent most appropriate to extinguish fire. In case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam.

Exposure effects
Causes gastrointestinal irritation with nausea, vomiting and diarrhea. The toxicological properties of this substance have not been fully investigated.
Causes respiratory tract irritation. May cause respiratory tract irritation. The toxicological properties of this substance have not been fully investigated.
Causes skin irritation. The toxicological properties of this material have not been fully investigated.
First aid 
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.

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