Phosphate diammonium hydrogen

Coesite. Coesite, the second most dense (3.01 g/cm ) phase of silica, was first prepared ia the laboratory by heating a mixture of sodium metasibcate and diammonium hydrogen phosphate or another mineraliser at 500—800°C and 1.5—3.5 GPa (14,800—34,540 atm). Coesite has also been prepared by oxidation of silicon with silver carbonate under pressure (67). The stmcture is monoclinic = 717 pm, Cg = 1.238 pm, and 7 = 120°. 

A mixture of 1.44 g. (0.0099 mole) of indole-3-carboxaldehyde,2 7.0 g. (0.053 mole) of diammonium hydrogen phosphate, 30 g. (30 ml., 0.34 mole) of 1-nitropropane, and 10 ml. of glacial acetic acid is refluxed for 12.5 hours. During the reflux period the pale-yellow mixture becomes dark red. The volatile reactants and solvent are removed under reduced pressure, and an excess of water is then added to the dark residue. After a short time, crude indole-3-carbonitrile precipitates rapidly. It is separated by filtration and dried under reduced pressure weight 1.20-1.34 g. (85-95%). Crystallization from acetone-hexane, with decoloriza-tion by activated carbon, yields 0.68-0.89 g. (48-63%) of fairly pure indole-3-carbonitrile, m.p. 179.5-182.5° (Note 1). 

Nitriles from aromatic aldehydes, diammonium hydrogen phosphate, and 1-nitropropane, 43, 59 w-Nitrobenzenesulfonyl chloride, reduction to m-nitrophenyl disulfide by hydriodic acid, 40, 80 2 Nitro-2,3-dimethylbutane, 43, 89... 

Those based on the reaction between magnesium oxide and diammonium hydrogen phosphate (DAP) (Sugama Kukacka, 1983a). 

Cement formation with diammonium hydrogen phosphate... 

Synonyms diammonium hydrogen phosphate secondary ammonium phosphate... 

When ammonia gas is bubbled through phosphoric acid solution, diammonium hydrogen phosphate is produced ... 

Diaminodiethylamine 1,6-Diaminohexane 1,1 l-Diamino-3,6,9-Triazaundecane Diammonium Citrate Diammonium Hydrogen Phosphate Diammonium Orthophosphate Diammonium Oxalate Diamyl Phthalate Di-N-Amyl Phthalate... 

Ammonium nitrate, a potential ingredient of terrorist bombs, can be made nonexplosive by addition of diammonium hydrogen phosphate, (NH HPO Analysis of a such a NH4N03-(NH4)2HP04 mixture... 

It has been claimed that NH4NO3 fertilizer can be rendered unexplodable (see Problem 19.121) by adding compounds such as diammonium hydrogen phosphate, (NH4)2HP04. Analysis of such a "desensitized" sample of NH4NO3 showed the mass % nitrogen to be 33.81%. 

Mark two matched test tubes as A and B and transfer 7.5 mL of sample to each. To tube A, add 0.5 mL amine-sulfuric acid reagent and 3 drops of FeCl3 solution. Invert it once and mix the solution. If sulfide is present, the color of the solution develops to blue within a few minutes. Allow the solution to stand for 5 min. After this, add 2 mL of diammonium hydrogen phosphate solution. 

Diammonium hydrogen phosphate solution 400 g (NH4)2HP04 in 800 mL distilled water. 

Although superphosphate fertilizer provides available phosphorus, it is advantageous to provide other needed elements such as nitrogen and potassium at the same time. Thus, diammonium hydrogen phosphate [(NH4)2HP04] provides both nitrogen and phosphorus, while potassium ammonium phosphate [K(NH4)HP04] makes available the three elements most needed in the maintenance of soil fertility. 

Wild apricot (Prunus armenica L.) grows naturally in hilly areas of northern India. It is highly acidic, fibrous, and low in TSS, and, thus, not utilized commercially. Preparation and evaluation of a vermouth from its fruit was undertaken (Abrol, 2009). Vermouths at different sugar (8,10, and 12 °Brix), alcohol (15%, 17%, and 19%), and spices levels (2.5% and 5%) were prepared. Those used in extract preparation are shown in Plate 8.1. The base wine was prepared from crushed fruit, adjusted to 24 °Brix, and diluted in a 1 2 ratio with water. To this mixture was added 200 ppm sulfur dioxide, 0.1% diammonium hydrogen phosphate (DAHP), and 0.5% pectinase enzyme. A 24-h active yeast culture initiated fermentation. The procedure is illustrated in Fig. 8.4. A maturation period of 6 months improved the quality of the vermouth. 

To determine orientation of an adsorbed molecule relative to the mineral surface, one would need to employ dipolar recoupling techniques to extract the distance constraints between the selected spin species of the molecule and of the surface. For polypeptide-HAp systems, 13C 31P REDOR has been carried out for uniformly 13C labeled molecules, where numerical simulations show that the effect of 13C dipole-dipole interaction is relatively minor.125 For a study of bone sample, o-phospho-L-serine was taken as the model compound for the setup of the 13C 31P REDOR experiments, where the data can be well analyzed by a l3C-3lP spin-pair model with the intemuclear distance equal to 2.7 A.126 Concerning the effect of 31P homonuclear dipolar interaction on the spin dynamics, Drobny and co-workers have carried out a detailed REDOR NMR study of polycrystalline diammonium hydrogen phosphate ((NH4)2F1P04).127,128 The results show that the 15N 31P REDOR data can... 

Most of the ammonia that is produced is employed as fertilizer or used to manufacture other fertilizers, such as urea, ammonium sulfate, ammonium nitrate, or diammonium hydrogen phosphate. Ammonia is also used in the Solvay process, and it is a starting material for the manufacture of cyanides and nitriles (which are used to make polymers such as nylon and acrylics) as well as aromatic compounds containing nitrogen, such as pyridine and aniline. 

The most important use of ammonia is in fertiliser production. Fertilisers are added to the soil to improve crop yields. A farmer has the choice of two fertilisers, ammonium nitrate, NH4NOj. or diammonium hydrogen phosphate, (NH4),HP04. 

Diammonium hydrogen phosphate (0 5m). Dissolve 66 g diammonium hydrogen orthophosphate, (NH4)2HP04, in water and dilute to 1 litre. 

The separations were accomplished by reversed-phase HPLC on a Cj8 (itBondapak) column with a precolumn packed with Cl8 COrasil, using a mobile phase of 0.01 M diammonium hydrogen phosphate-acetonitrile (100 5) at pH 5.5 adjusted with 20% phosphoric acid. Detection was at 259 nm. The separation obtained is shown in Figure 9.115. 

Cetin et al. [29] used a HPLC method for the determination of lomox-icam. The measurements were made by using Perkin Elmer 200 Series with UV detector. Cig column was used as an analytical column and analysis were detected at 364 mn. The mobile phase was methanol acetonitrile and aqueous solution of diammonium hydrogen phosphate. Retention time of lornoxicam was 1.87 min. The drug was separated on Ci8 column (ODS Hypersil 5 pm 25 cm x 4.6 mm) with a flow rate of 1.6 ml/min. The linear calibration range was found to be 1-30 pg/ml. 

Mn3C manganese carbide 12266-65-8 25.00 6.8900 1 2734 N2H9P04 diammonium hydrogen phosphate 7783-28-0 20.00 1.6131 1... 

Industrially, three compounds are produced and utilized ammonium dihydrogen phosphate, diammonium hydrogen phosphate and ammonium polyphosphate. The two hydrogen phosphates are obtained from ammonia and pure phosphoric acid. If the ammonia is added stepwise, wet-process acid can also be used. 

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