Ammonium phosphates properties

An aqueous solution of mono ammonium phosphate [10361-65-6] reacts with MgO to form ammonium magnesium phosphate hexahydrate [15490-91-2], NH MgPO 6H20. Several other species of hydrated phosphates are created during this reaction which takes place quickly and produces compounds that have desirable properties as cementing agents. The hexahydrate is the most prevalent. Properties are given in Table 22. 

Inorganic Chemistry of the Main-group Elements Apatites. Interest in this subject continues in view of its importance in biological systems. A hydroxylapatite with similar properties to biological apatites results when ammoniacal CaCl2 and ammonium phosphate solutions are added dropwise to an ammonia buffer at pH 9.523 The uptake of lead by synthetic calcium hydroxylapatite has been studied.524... 

The concept of fire-retardancy is remarkably old. The Greek historian, Herodotus, in 484-431 BC recorded that the Egyptians imparted fire-resistance to wood by soaking it in a solution of alum (potassium aluminum sulfate) [Browne, 1958]. The Romans added vinegar to the alum for the same purpose. Vitruvius in the first century BC described the natural fire-retardant properties of the larch tree and some military applications of fire retardant materials such as plaster of clay reinforced with hair [Vitruvius, I960]. In 1638, Circa recorded that Italian theaters were painted with a mixture of clay and gypsum (potassium aluminum silicate and hydrated calcium sulfate) to protect them from fire. Wild was issued a British patent in 1735 for his process of treating wood with a mixture of alum, ferrous sulfate and borax (sodium tetraborate decahydrate). And Gay-Lussac in 1821 showed that a solution of ammonium phosphate, ammonium chloride and borax acts as a fire-retardant for wood. 

Besides their uses as pigments, many oxides exhibit catalytic properties, making them a very important class of compounds, for both basic and technological research. Phosphates, on the other hand, have also a lot of practical uses, for example, fertilizers based on ammonium phosphate. 

The following starting reagents were used for the synthesis of nanosized pigments with the anticorrosive properties on a basis of the zinc phosphates, namely zinc acetate Zn(CHfdOO) -2Hf) (State standard specification 4174-77) from the Sfera Sim with the content of the main substance 99.5% and ammonium phosphate (NHJPO (State standard specification 4174-78) from the Sfera Sim with the content of the main substance " 99.0%. 

Finally, powders made from Ca0-Si02-P20j-CaF2 glasses of appropriate composition also exhibit hydraulic properties, if ammonium phosphate is added to the mixing water... 

Wagh, A.S. et al. (1993) Mechanical properties of ammonium phosphate cements and their zeolite composites. Ceramic Transactions 37, 139-152. 

Ammonium phosphates, particularly DAP, are the most popular phosphate fertilizers worldwide because of their high analysis and good physical properties. The compositions of the pure salts - monoammonium phosphate (MAP) and DAP - are given in Table 12.4. 

Tennessee Valley Authority. 1970. Effect of Aluminum and Iron on the Physical Properties of Ammonium Phosphate Fertilizers, IN Neuj... 

Phosphorous. The presence of trace amounts of phosphorus in metals and semiconductors is known to affect material properties. The produced in the (n,y) reaction is a pure emitter and has to be separated and rigorously purified. Paul (1998,2000) developed a method for P determination in steels and other high-temperature refractory alloys of interest to the aircraft industry. Irradiated samples were dissolved passed through cation-exchange columns to remove Co, Ni, and Cr followed by repeated precipitations of magnesium ammonium phosphate and ammonium phosphomolybdate. One of the major advantages of this technique is the determination of the chemical yield by gravimetry. Phosphorus was determined by INAA in matrices other than metals, e.g., polymers. In this case, the beta spectrum was corrected for interferences and self-absorption (St-Pierre and Kennedy 1998). A modified version of this procedure has been used to certify implanted phosphorus in silicon (Paul et al. 2003). 

Improved bond strength in ceramic bodies is attained with mixtures of monoaluminum phosphate and colloidal silica when used with finely divided refractory powders of zircon, zirconia, or alumina (480). The reaction of P,0, with silica at relatively low temperature develops high bond strength in refractory compositions thus silica sol may be mixed with ammonium phosphate or other P,Os precursors at relatively low pH and used in minimal quantities as a binder in refractories (481,482). According to Lee, the binding properties of colloidal silica are improved by adding a soluble quaternary ammonium silicate such as tetramethylammonium silicate which is sufficiently alkaline to interact with the colloidal silica and cdhlesce it in a cement structure (483). 

Cerium ammonium phosphates can be obtained by heating Ce(in) compounds and Ce02 with ammonium phosphates at 400°C (Vaivada and Konstant, 1979). The formulas of the compounds prepared by this method are CeNH4P40j2 and Ce(NH4)2(P03)5. A summary of the preparation and properties of ammonium cerium condensed phosphates has been published by Rzaigui and Ariguip (1983). 

Ammonium Phosphate fertilizer 10 15-25 9 Resistant little or no change in weight small effect on mechanical properties generally suitable for practical use Nylatron Quadrant EPP... 

Chem. Descrip. Polypropoxylated quat. ammonium phosphate Uses Dispersant for electronics industry Properties Liq. 

Monohydrazinium phosphate (MHP) and dihydrazinium phosphate (DHP) have also been investigated as flame retardants of cellulose and compared with the corresponding ammonium phosphates [6,7]. The flame retardant property of hydrazinium phosphates is checked using a Whatman No. 40 filter paper with an ash content of 0.018% as the cellulose source. This filter paper is treated with hydrazinium phosphates by dipping it into aqueous solutions of selected concentrations of 2.5% and 10% to ensure that the desired weight of phosphate is retained on the sample. The samples are then dried in air and used in pyrolysis experiments. 

In general, the first step in virtual screening is the filtering by the application of Lipinski s Rule of Five [20]. Lipinski s work was based on the results of profiling the calculated physical property data in a set of 2245 compounds chosen from the World Drug Index. Polymers, peptides, quaternary ammonium, and phosphates were removed from this data set. Statistical analysis of this data set showed that approximately 90% of the remaining compounds had ... 

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