1. Methods of test for phosphoric acid (orthophosphoric acid) for industrial use. Determination of total phosphorus (V) oxide content: quinoline phosphomolybdate gravimetric method Part 7, (31st January 1978) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (12 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗