AMany metal salts are extremely toxic if inhaled or swallowed. Extreme care mustbe taken to ensure that samples and standards are handled properly and that all exhaust gasesare pThe acidification of samples containing reactive materials may result in the releaseof toxic gases, such as cyanides or sulfides. For this reason, the acidification and digestion ofsamples should be performed in an approved fume hood.roperly vented. Wash hands thoroughly after handling.