Triammonium phosphate can be prepared in the laboratory by treating 85% phosphoric acid with 30% ammonia solution:
(NH4)3PO4 is a colorless, crystalline solid. The solid, which has the odor of ammonia, is readily soluble in water. The salt converts to diammonium hydrogen phosphate (NH4)2HPO4.
Schrödter, Klaus; Bettermann, Gerhard; Staffel, Thomas; Wahl, Friedrich; Klein, Thomas; Hofmann, Thomas (2008). "Phosphoric Acid and Phosphates". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a19_465.pub3. ISBN 978-3-527-30673-2. 978-3-527-30673-2 ↩
Press • •, Tammy Webber | The Associated (2025-01-14). "What to know about the pink flame retardants are being used for California fires". NBC Los Angeles. Retrieved 2025-01-15. https://www.nbclosangeles.com/news/local/pink-flame-retardants-california-wildfires/3604543/ ↩