How is arsine gas produced?

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A labeled diagram of the periodic table entry for arsenic, showing its atomic number 33, symbol As, atomic weight 74.921595, electron configuration, and classification as an other nonmetal. Additional icons indicate arsenic is solid at room temperature, has a rhombohedral crystal structure, and weakly acidic oxides. — arsenic Properties of arsenic.

Arsine (AsH $_{3}$ ), a colorless and extremely poisonous gas, is produced through two primary chemical processes:

Hydrolysis: The gas is generated by the hydrolysis of metal arsenides.1
Reduction: It is produced by the reduction of arsenic compounds by metals when placed in acidic solutions.1

Because of its high toxicity, exposure to arsine must be strictly controlled, with safety standards requiring concentrations to be kept below 0.05 parts per million in the air for an eight-hour duration.2