Used in semiconductor manufacturing, particularly in gallium arsenide (GaAs) for high-speed electronic devices and optoelectronics like LEDs, lasers, and solar cells.

Employed in wood preservatives, such as chromated copper arsenate (CCA), to protect against decay and insect damage.

Found in some pesticides, herbicides, fungicides, insecticides, and termiticides for agricultural and pest control uses, though largely phased out due to high toxicity to humans and the environment.

Historically used in alloys, especially with lead in batteries, to improve hardness, strength, and corrosion resistance.

Limited use in medical treatments, such as arsenic trioxide for certain types of leukemia, though highly restricted due to toxicity.

Also used in glass production to remove greenish tints caused by iron impurities.