Phosphine

**Semantic type:** Inorganic Chemical

**Definition:** A highly toxic phosphorus hydride that is formed naturally via the anaerobic decay of phosphorus-containing organic matter or is prepared by an alkali metal hydroxide or white phosphorus hydrolysis reaction. Phosphine is used in industrial processes, in flame retardant production, and as a pesticide. It is characterized as a colorless gas that is odorless when pure. Exposure occurs by inhalation, ingestion, or contact.

**Synonyms:** - PHOSPHINE