554. Ammonium Sulfamate

Nomenclature

CAS number: 7773-06-0
Sulfamic acid ammonium salt (1:1); AMS; Ammate (DuPont).
H6N2O3S; mol wt 114.12.
H 5.30%, N 24.55%, O 42.06%, S 28.10%.
NH4SO3NH2.

Description and references

Weed-killing prepn: Cupery, Tanberg, US 2277744 (1941 to du Pont). Prepn from ammonia and sulfamic acid: Sisler, Audrieth, Inorg. Synth. 2, 180 (1946). Toxicity study: Ambrose, J. Ind. Hyg. Toxicol. 25, 26 (1943).

Properties

Hygroscopic crystals (large plates). mp 131°, dec 160°. Extremely soluble in water, liquid NH3; slightly soluble in ethanol; moderately soluble in glycerol, glycol, formamide. pH of 0.27M soln in H2O = 4.9. Aq solns are stable to boiling. LD50 orally in rats: 3.0 g/kg (Ambrose).

Caution

Potential symptoms of overexposure are irritation of eyes, nose and throat; coughing, dyspnea. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 16.

Use

In the manuf of fire-retardant compositions, for flameproofing textiles and paper products; in the manuf of weed killing compositions; in electroplating solns; for the generation of nitrous oxide gas.