Fertilizer Materials, Melting Points in Orthophosphoric Acid-Pyrophosphoric Acid System

1962 ◽  
Vol 10 (4) ◽  
pp. 344-346
Author(s):  
Z. T. Wakefield ◽  
E. P. Egan
Keyword(s):  
Orthophosphoric Acid ◽  
Acid System ◽  
Melting Points ◽  
Pyrophosphoric Acid

The Mechanical Properties and Microstructures of Cement Formed from Pyrophosphoric and Orthophosphoric Acids

2005 ◽  
Vol 284-286 ◽  
pp. 125-128 ◽  
Author(s):  
Liam M. Grover ◽  
Uwe Gbureck ◽  
David Farrar ◽  
J.E. Barralet
Keyword(s):  
Mechanical Properties ◽  
Acid Solution ◽  
Tricalcium Phosphate ◽  
Orthophosphoric Acid ◽  
Marked Change ◽  
Solution Set ◽  
Liquid Ratio ◽  
Setting Times ◽  
Pyrophosphoric Acid ◽  
Orthophosphoric Acid Solution

In this study the setting times, compressive strengths and microstructures of cements formed using pyrophosphoric acid solution and b-tricalcium phosphate (β-TCP; Ca3(PO4)2) were compared with those of cement formed using orthophosphoric acid solution and b-TCP. It was found that cement formed using pyrophosphoric acid solution set more slowly than that formed using orthophosphoric acid and could be mixed to a higher powder to liquid ratio, facilitating the production of cement exhibiting compressive strengths, without pre-compaction, as high as 25 MPa. The use of pyrophosphoric acid as opposed to orthophosphoric acid resulted in a marked change in the microstructure of the cement.

scholarly journals V.—A New Hydrate of Orthophosphoric Acid

1910 ◽  
Vol 30 ◽  
pp. 63-64
Author(s):  
Alexander Smith ◽  
Alan W. C. Menzies
Keyword(s):  
Melting Point ◽  
Phosphoric Acid ◽  
Systematic Study ◽  
Orthophosphoric Acid ◽  
Pure Form ◽  
Melting Points

Our purpose was, by a systematic study of the solubilities concerned, to ascertain whether any hydrates of orthophosphoric acid, other than a semi-hydrate, 2H3PO4,H2O (Joly's hydrate), exist. The solubilities of phosphoric acid and Joly's hydrate at various temperatures had not previously been measured. Crystalline, anhydrous phosphoric acid and Joly's hydrate were prepared in pure form. The solid was stirred in a thermostat with water until equilibrium was reached at each temperature, and the concentration of the solution was determined. The diagram (fig. 1) shows the results. AB is the curve of solubilities of Joly's hydrate from −16° to 29·35°, its melting point. BC contains the melting points of Joly's hydrate, depressed by phosphoric acid.

System ammonia-potassium monoxide-orthophosphoric acid-pyrophosphoric acid-water at 25.deg.

1973 ◽  
Vol 21 (4) ◽  
pp. 700-704 ◽  
Author(s):  
A. William Frazier ◽  
Ewell P. Dillard ◽  
Raymond D. Thrasher ◽  
Kjell R. Waerstad
Keyword(s):  
Orthophosphoric Acid ◽  
Acid Water ◽  
Pyrophosphoric Acid

scholarly journals Extraction-photometric determination of osmium using quaternary water-thiopyrine-trichloroacetic and orthophosphoric acid system

2020 ◽  
Vol 99 (3) ◽  
pp. 61-65
Author(s):  
L.S. Egorova ◽  
◽  
E.A. Leites ◽  
Keyword(s):  
Ascorbic Acid ◽  
Organic Solvent ◽  
Orthophosphoric Acid ◽  
Photometric Determination ◽  
Model Mixture ◽  
Acid System ◽  
Optimal Conditions ◽  
Liquid Component ◽  
Effect Of Copper

The article is devoted to the extraction-photometric determination of osmium. The aim was to modify the well known extraction-photometric determination of osmium by replacing chloroform, used as an organic solvent in a traditional extraction system, on to water, which is the only liquid component in the layering system. This made it possible to eliminate the toxic organic solvent from the system. The optimal conditions for the osmium extraction were selected, taking with the fact that the consumption of thiopyrine, as an expensive reagent, should be minimal. The results of the developed methodology for determining microgram amounts of osmium with thiopyrine were presented by the example of a model mixture corresponding to the composition of a platinum sponge. The interfering effect of Al (lII), B (lII), Bi (IIl), Fe (llI), Au (lII), lr (II), Cd (ll), Co (II), Ca (II), Si ( IV), Mg (II), Mn (II), Cu (Il), Mo (VI), As (V), Ni (lI), Sn (lV), Pd (Il), Rh (II), Pb (II), Ag (I), Sb (IIl), Te (IV), Cr (IlI), Zn (Il) contained in a platinum sponge was investigated. The interfering effect of copper has been established, which is eliminated by masking with ascorbic acid.

System ammonia-zinc oxide-orthophosphoric acid-pyrophosphoric acid-water at 25.deg.

1975 ◽  
Vol 23 (2) ◽  
pp. 330-334
Author(s):  
A. William. Frazier ◽  
Ewell F. Dillard ◽  
James R. Lehr
Keyword(s):  
Zinc Oxide ◽  
Orthophosphoric Acid ◽  
Acid Water ◽  
Pyrophosphoric Acid

On-Line In-Situ Diagnostics of Processes Within HT-PEM Fuel Cells Membrane by Raman Microscopy

2013 ◽  
Author(s):  
Hans Bettermann ◽  
Martin Labus ◽  
Anne Majerus ◽  
Carsten Korte ◽  
Werner Lehnert
Keyword(s):  
Fuel Cell ◽  
Polyphosphoric Acid ◽  
Orthophosphoric Acid ◽  
Pem Fuel Cell ◽  
Pem Fuel Cells ◽  
Current Consumption ◽  
Pyrophosphoric Acid ◽  
On Line ◽  
Concentration Changes

This contribution describes how Raman spectroscopy can be applied to investigate the distribution of molecular species inside an ABPBI membrane of a running PEM fuel cell. For the in-situ measurements an experimental setup was first developed and then used to identify phosphoric acid species and to record how they change their concentrations when the current consumption of the fuel cell was changed. The observation port to look inside the membrane was placed next to the cathode. At that location among orthophosphoric acid, H3PO4·H2O, a lot of oligophosphoric acid species are present where pyrophosphoric acid could unambiguously be identified. In comparison to all identified species pyrophoshoric acid and polyphosphoric acid undergo largest concentration changes when the current was changed.

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