Definitions.

As used in this subpart, all terms not defined herein shall have the meaning given them in the Act and in subpart A of this part. (a) Superphosphoric acid plant means any facility that concentrates wet-process phosphoric acid to 66 percent or greater P 2 O 5 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 P 2 O 5 feed means the quantity of phosphorus, expressed as phosphorus pentoxide, fed to the process. [40 FR 33155, Aug. 6, 1975, as amended at 65 FR 61757, Oct. 17, 2000; 80 FR 50433, Aug. 19, 2015]