ASNT Level III- Visual & Optical Testing

7.3.6 Disposal
Before disposing of chemical solutions, check environmental
regulations (federal, state and local) and safety
department procedures. The steps listed here are used only
if there are no other regulations for disposal. Spent etchants
are discarded and must be discarded separately—mixing of
etchant materials can produce violent chemical reactions.
Using a chemical resistant drain under an exhaust hood,
slowly pour the spent etchant while running a heavy flow of
tap water down the drain. The drain is flushed with a large
volume of water.
Charlie Chong/ Fion Zhang