Separated from strong acids, organic materials, ammonia, food and feedstuffs, cool, dry, keep in a well-ventilated room. The substance decomposes on heating producing toxic fumes of selenium. Attacks many metals in presence of water. The substance is corrosive to the eyes, the skin and the respiratory tract. Inhalation of the substance may cause chemical pneumonitis.
Medical observation is indicated.
Repeated or prolonged contact with skin may cause dermatitis. Nasopharyngeal irritation, gastrointestinal distress and persistent garlic odour may occur. The substance can be absorbed into the body by inhalation of its aerosol, through the skin and by ingestion. The symptoms of lung oedema often do not become manifest until a few hours have passed and they are aggravated by physical effort.