The purpose of this section is to impose certain requirements on activities involving hexavalent chromium-based water treatment chemicals to prevent unreasonable risks associated with human exposure to air emissions of hexavalent chromium from comfort cooling towers. 1), and zinc potassium chromate ( CAS No. ), dichromic acid (CAS No.1), potassium chromate ( CAS No. Other examples of hexavalent chromium compounds that can be used to treat water are: Chromic acid ( CAS No. Hexavalent chromium-based water treatment chemicals that contain hexavalent chromium, usually in the form of sodium dichromate ( CAS No. § 749.68 Hexavalent chromium-based water treatment chemicals in cooling systems.
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