#arsenious
- Arsenous — Said of an acid or a chemical compound in which arsenic has a lower valence (usually the +3 oxidation state), such as arsenous acid (H3AsO3). In classical chemical nomenclature, this adjective differentiates trivalent arsenic compounds from pentavalent ones (called arsenic), indicating distinct physico-chemical properties, a specific solubility, and a different toxicological profile in reactions with organic substances.
- Arsenite — A salt or ester of arsenious acid, structurally obtained through the chemical reaction of arsenic trioxide with a base or an alcohol. Compounds in this class are highly toxic and were historically used on a large scale as insecticides, pesticides, wood preservatives, or herbicides in agriculture, their application being currently strictly regulated due to major environmental and groundwater contamination risks.