Code of Federal Regulations Title 40. Protection of Environment § 40.60.211 Definitions

(a) Superphosphoric acid plant means any facility that concentrates wet-process phosphoric acid to 66 percent or greater P₂O₅ content by weight for eventual consumption as a fertilizer. A superphosphoric acid plant includes:  evaporators, hot wells, acid sumps, oxidation reactors, and cooling tanks. An oxidation reactor includes any equipment or step that uses an oxidizing agent (e.g., nitric acid, ammonium nitrate, or potassium permanganate) to treat superphosphoric acid.

(b) Total fluorides means elemental fluorine and all fluoride compounds as measured by reference methods specified in § 60.214, or equivalent or alternative methods.

(c) Equivalent P₂O₅ feed means the quantity of phosphorus, expressed as phosphorus pentoxide, fed to the process.