Ammonium sulfamate crystals
| IUPAC name
| Other names
|Molar mass||114.125 g/mol|
|Appearance||White crystalline solid, hygroscopic|
|Melting point||131 °C (268 °F; 404 K)|
|Boiling point||160 °C (320 °F; 433 K) (decomposes)|
|197.8 g/100 ml (25 °C)|
|Solubility|| Soluble in ethylene glycol, formamide, glycerol, liq. NH3|
Insoluble in diethyl ether, ethanol, methanol, n-octanol
|Vapor pressure||~0 mmHg|
|Safety data sheet||Sigma-Aldrich|
|Lethal dose or concentration (LD, LC):|
LD50 (Median dose)
| 2,000 mg/kg (rat, oral)|
3,100 mg/kg (mouse, oral)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Ammonium sulfamate (or ammonium sulphamate) is a white crystalline solid, readily soluble in water. It has the formula H6N2O3S, also written NH4SO3NH2.
Ammonium sulfamate reacts with benzamide at high temperatures to form benzonitrile.
Ammonium sulfamate is a hygroscopic white solid, soluble in water.
Ammonium sulfamate is sold as compost accelerator, and it's very pure. In UK, it is sold by Lancelot Garden Products and can be bought in 1, 5, 10 or 25 kg bags.
Ammonium sulfamate is no longer an accepted herbicide in the EU since 2008 due to the Irish Rapporteur not receiving testing on dogs for said chemical and thus the compound did not receive the license to be allowed as herbicide. However, ammonium sulfamate is still legally allowed to be used as compost accelerator. Since both products are found in the same section of most stores (gardening) or online stores just a click away, nothing will stop anyone who knew that the compost accelerator can also be used as herbicide to, well, use it as herbicide.
To limit hydrolysis, the reaction temperature must be kept below 50 °C.
- Make guanidinium sulfate
- Herbicide and compost accelerator in gardening
Ammonium sulfamate is considered to be slightly toxic to humans and animals, making it appropriate for amateur home garden, professional and forestry uses. It is generally accepted to be safe for use on plots of land that will be used for growing fruit and vegetables intended for consumption.
It is also considered to be environmentally friendly due to its degradation to non-harmful residues.
In closed airtight bottles or bags, since it's hygroscopic.
No special disposal is required. You may dilute it in water and pour it down the drain or dump it over weeds.
- Standritchuk, O. Z.; Maksin, V. I.; Zapol'skii, A. K.; Russian Journal of Physical Chemistry; vol. 63; nb. 9; (1989)