DAO 2021-09 regulates which category of chemicals?

• A. Hexavalent chromium compounds
• B. Trivalent chromium compounds
• C. Nickel compounds
• D. Lead compounds

Answer: (A)

Hexavalent chromium compounds are targeted because Cr(VI) is a highly toxic, carcinogenic hazard, especially through inhalation or skin contact. DAO 2021-09 establishes a Chemical Control Order specifically for these compounds, setting rules that cover import, manufacture, distribution, sale, use, handling, storage, and disposal. It also requires licenses, proper labeling, safety data sheets, exposure monitoring, and applicable medical surveillance to protect workers and prevent environmental contamination. The focus on Cr(VI) reflects the serious health risks associated with this category, particularly in industries like electroplating and pigment production where these compounds are commonly used. Other metals or chromium forms are regulated, but this particular order is the one that concentrates on hexavalent chromium compounds due to their distinct hazard profile.