Ammonia NH3Characteristics:- Anhydrous Ammonia is a colorless gas with a distinct pungent odour. It is extremely soluble in the water forming a caustic alkaline solution of ammonium hydroxide (NH4OH). It is one of the most widely used industrial gases as a catalyst & reagent.Main Use:- 1) As a Refrigerant 2) To manufacture FertilizersAlthough the gas is lighter than air it can behave paradoxically in an accidental release from storage in liquid form under pressure by undergoing rapid cooling cooling to form a dense cloud that hugs the ground.Toxic Effects:- Acute:- 1) Smell felt at 30-50 ppm. At this ppm there is irritation of Eyes &

Mucous Membrane of Respiratory Tract.2) Upto 500 ppm:- Cough, Hoarseness of Voice 7 Tightness of Throat, Eye Irritation & Conjunctivitis like symptoms.3) 500-1,000 ppm:- It is life threatening & causes

a) Chemical Burns of Nose, Mouth, Throat & Corneab) Laryngeal Edemac) Pulmonary Edemad) Broncho Pneumoniae) Hoarseness & Dyspnoeaf) Death due to b,c&d

Laryngeal Spasm:- This is peculiar in Ammonia. Laryngeal Spasm & Spasm of Glottis are frequent. This can produce Asphexia & Death, but spasm will relief if the person becomes Unconscious.4) Effect on Eyes:- Ophthalmic complications like a) Corneal Opacity

b) Cataract Formation c) Glocoma5) Effect on the Skin:- A jet of the Anhydrous Ammonia on the moist Skin can cause second degree burns.6) Gastritis:- It continues several months after a gasing exposure.7) The person who survives as acute gasing attack may develop permanent Respiratory Disabilities like a) Progressive Airway Obstruction b) Decreased Diffusion Capacity c) Bronchiolitis Oblitarance d) Bronchiactasis e) Continuous Cough & Sputum.

Treatment:- Symptomatic.