Secondary ammonium phosphate

Synonyms diammonium hydrogen phosphate secondary ammonium phosphate... 

The ordinary salt, secondary ammonium phosphate, (NH4)2HP04, is prepared by concentrating a solution of phosphoric acid with addition of sufficient ammonia to prevent the development of an acidic reaction. It forms monoclinic crystals,8 of density 1-6199 or 1-678.10 It readily loses ammonia, with formation of the primary phosphate, the decomposition being rapid at 166° C.11 Above this temperature the primary phosphate is transformed into pyrophosphate. The aqueous solution of the secondary phosphate has a strongly alkaline reaction, and is decomposed by boiling, with evolution of ammonia and formation of the primary salt. 

The most important of the double salts of phosphoric acid with ammonium and the alkali-metals is sodium ammonium hydrogen phosphate or microcosmic salt, NaNH4HP04,4H20, a constituent of putrefying urine, and also present in guano under the name stercorite.17 It can be prepared by the interaction of secondary sodium phosphate and ammonium chloride, or that of secondary ammonium phosphate and sodium chloride. It forms colourless columnar crystals belonging... 

SYNS AMMONIUM PHOSPHATE DIAMMON-IUM HYDROGEN PHOSPHATE DIBASIC AMMONIUM PHOSPHATE SECONDARY AMMONIUM PHOSPHATE... 

Ammonium phosphate. See Ammonium phosphate, dibasic Ammonium phosphate, dibasic CAS 7783-28-0 EINECS/ELINCS 231-987-8 Synonyms Ammonium phosphate DAP Diammonium hydrogen orthophosphate Diammonium hydrogen phosphate Diammonium phosphate Dibasic ammonium phosphate Phosphoric acid diammonium salt Secondary ammonium phosphate... 

J. J. Berzelips prepared crystals of tetrahydrated sodium ammonium hydro phosphate, Na(NH4)HP04.4H20, in 1816, by cooling a hot aq, soln. of five parts secondary sodium phosphate, Na2HP04.12H20, with two of the corresponding... 

Sulphate Sulphonate Ether sulphate Ether phosphate Ether carboxylate Carboxylate Primary ammonium Secondary ammonium Tertiary ammonium Quaternary ammonium Amine oxide Betaine... 

Secondary Ammonium Ammonium Phosphate Socius Biborate Sodium Borate... 

The effect of phosphate on alkaloid production has also been evaluated (138). Using a modified induction medium devoid of phosphate and other essential growth factors, production of secondary compounds was more rapid than when phosphate was present. A broader study of the phenomenon has been reported by a French group (139) where, using three alkaloids as markers, the disappearance of the major nutrients from the medium and the evolution of phosphates, nitrates, ammonium ions, glucose, and starch in the cells were observed over time. It was not possible to relate alkaloid accumulation to the appearance or disappearance of any one metabolite in particular. However, other workers have found that the rate of biomass accumulation was directly related to the rate of formation of cellular serpentine (40) (140). 

The orthophosphates.—Orthophosphoric acid forms three salts, normal or tertiary, secondary, and primary phosphates, according as all, two, or one of its hydrogen atoms is replaced by an equivalent radicle.26 The hydrogen atoms may be replaced by different radicles. Thus, the secondary acid salt—ammonium sodium hydrogen phosphate, also called microcosmic salt—is illustrated by the subjoined graphic formula along with the formulae for the acid and the primary, secondary, and tertiary sodium salts ... 

---