General chemical information and human exposure limits
Anhydrous is a term that identifies the chemical is without water. Terms used for ammonia in water are aqua ammonia, ammonium hydroxide or ammonia liquor. Ammonia in water has properties vastly different than those of anhydrous ammonia and the two should not be confused.
R717, Spirit of Hartshorn, nitro-sil, am-fol, liquid nitrogen. It is sometimes referred to as 82-0-0 where 82 refers to the percent of nitrogen fertilizer provided.
An alkali is a base that produces hydroxide ions ( OH- ) when dissolved in water. Bases are typically water-soluble and always have a pH greater than 7 when in solution.
The ammonia molecule consists of one atom of nitrogen (N) and three atoms of hydrogen (H). It is produced by combining atmospheric nitrogen which constitutes 78% of the air we breathe with hydrogen. This nitrogen fixation requires high temperature and pressure in the presence of an iron catalyst.
Consists of greater than 99% ammonia with the remainder being water. The CAS number assigned to ammonia by the American Chemical Society is 7664-41-7.
The liquid and gas are colorless. The white cloud you observe during an ammonia release is the ammonia freezing the water droplets in the air to ice. Gas has a penetrating, pungent, suffocating odor
People working with ammonia may become desensitized and not be able to detect ammonia at low concentrations. Also, exposure levels which are tolerated by the average person may cause respiratory damage to others. The concentrations below are from ammonia in air by volume.
Minnesota Department of Agriculture (MDA), 625 Robert Street N, St. Paul, MN 55155-2538, email@example.com