Sodium dichromate dehydrate (SDD), a hexavalent chromium compound
[1] is commonly used as an oxidizing agent.
[2] Chromium (VI) compounds are genotoxic and group 1 IARC (International Agency for Research on Cancer) carcinogen.
[3] SDD is one of the common contaminants found in drinking water. Its toxic effects and carcinogenicity has been studied.
[1][3][4][5]