orthophosphaten.
/ˌɔːθə(ʊ)ˈfɒsfeɪt/, U.S. /ˌɔrθoʊˈfɑsˌfeɪt/ Chemistry.
A salt or ester of orthophosphoric acid; a salt containing the anion PO43− or one of its protonated forms HPO42− or H2PO4−; any of these anions. Cf. phosphate n. 1.
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1859 W. Odling in London, Edinb., & Dublin Philos. Mag. 4th Ser. 18 368 Intermediate between common or orthophosphates and metaphosphates we have several varieties of compounds, among which the best defined are the pyrophosphates, salts which result from the union of an atom of orthophosphate with an atom of metaphosphate.
1876 J. Harley Royle's Man. Materia Med. (ed. 6) 66 Neutral solutions of the orthophosphates..give precipitates with salts of lime and baryta.
1951 A. W. Johnson et al. in E. H. Rodd Chem. Carbon Compounds I a. iv. 342 A mixture of phosphates, known commercially as ‘hexaethyl tetraphosphate’, is formed when POCl3 reacts with triethyl orthophosphate.
1952 A. M. Smith Manures & Fertilisers vi. 135 Calcium is divalent..and the corresponding calcium orthophosphates are: Ca(H2PO4)2—monocalcium phosphate; CaHPO4—dicalcium phosphate; Ca3(PO4)2—tricalcium phosphate or simply calcium phosphate.
1998 Water & Waste Treatm. May 32/3 In simple terms, alum or iron salts react with soluble orthophosphate to produce a precipitate.
This entry has been updated (OED Third Edition, September 2004; most recently modified version published online March 2022).
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