pyrophosphaten.

1827 T. Clark in Edinb. Jrnl. Sci. 7 301 By simply drying the common phosphate of soda and heating it to redness, an entirely new salt had been produced. This new salt I shall, in the sequel of this paper, call pyrophosphate of soda.

1849 Q. Jrnl. Chem. Soc. 1 183 In the year 1834, Persoz..proposed the use of pyrophosphate of ammonia as a means of separating the oxide of nickel from oxide of cobalt.

1912 E. Feilmann tr. E. Molinari Treat. Inorg. Chem. 348 The pyrophosphates..give a precipitate with copper salts, which is soluble in excess of pyrophosphate.

1950 N. V. Sidgwick Chem. Elements I. 746 Ethyl pyrophosphate Et₄P₂O₇ can be made from the silver salt and ethyl iodide.

1957 G. E. Hutchinson Treat. Limnol. I. xii. 728 Though pyrophosphate plays an important role inside the organism, it is easily hydrolyzed and only orthophosphate is likely to be of importance in the environment.

1970 E. J. Ambrose & D. M. Easty Cell Biol. vii. 248 There is another type of reaction..in which a sugar phosphate reacts with another sugar to form a disaccharide and inorganic pyrophosphate.