Chromated copper arsenate (CCA) is a wood preservative that combines copper, chromium, and arsenic to protect wood from decay, insects, and fungi. It is commonly used in outdoor applications, such as decks, fences, and utility poles, due to its effectiveness in prolonging the lifespan of treated wood. The use of CCA has raised environmental and health concerns because of the toxicity of its components, particularly arsenic. As a result, many countries have restricted or banned its use in residential applications, leading to the development of alternative wood preservatives that are safer for both humans and the environment.