Arsenic trioxide

Arsenic trioxide, also known as white arsenic, arsenous oxide, or arsenicum album, is an inorganic compound derived from arsenic-bearing ores, typically as a byproduct of smelting operations. It is classified under Salts & Minerals and carries CAS number 1327-53-3.

In pharmaceuticals, arsenic trioxide is the active ingredient in treatments for acute promyelocytic leukemia, where it induces apoptosis and differentiation in malignant cells. In mining and metallurgy, it functions as a wood preservative and biocide, disrupting cellular enzyme activity in target organisms to prevent biological degradation.

Arsenic trioxide is subject to strict regulatory controls under REACH and classified as a Category 1A carcinogen under CLP regulations, requiring documented end-use justification for procurement. Buyers must comply with applicable national authorisation requirements. It is available in technical and pharmaceutical grades, with supply handled under controlled conditions appropriate to its hazard classification.