Studies in condensed phosphates. Part VI. Paper chromatographic studies of condensed phosphates

1964 ◽  
Vol 2 (9) ◽  
pp. 3959-3962
Author(s):  
R. C. Mehrotra ◽  
V. S. Gupta
Keyword(s):  
Condensed Phosphates

Hydrolysis of Condensed Phosphates in Soils

1965 ◽  
Vol 29 (4) ◽  
pp. 487-488
Author(s):  
R. R. Allmaras ◽  
C. A. Black
Keyword(s):  
Condensed Phosphates ◽  
Hydrolysis Of

A Contribution to the Structure Characteristics and Phase Composition of Vanadium-Phosphorus Catalysts Prepared from the VOPO4.xH2O.yH3PO4 Precursor

1992 ◽  
Vol 57 (12) ◽  
pp. 2475-2480 ◽  
Author(s):  
Milan Brutovský ◽  
Štefan Gerej ◽  
Ján Novák ◽  
Lucia Ferdinandyová
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Ir Spectra ◽  
Metal Cations ◽  
Preparation Procedure ◽  
Final Temperature ◽  
Structure Characteristics ◽  
Heat Treatment Regime ◽  
Condensed Phosphates ◽  
Defective Crystals

Catalysts were prepared from VOPO4.xH2O.yH3PO4 (x = 0.3-2, y = 0.2-0.85) by reduction with SO2 up to a final temperature of 750-800 °C, and activated in a reaction mixture of 1.0-1.4% butane in air up to 500 °C. The structure characteristics and phase composition of the catalysts were found to be affected by the preparation procedure and heat treatment regime. Their diffraction lines and IR spectra revealed that the catalysts from larger and less defective crystals than catalysts which were obtained from the VOHPO4.xH2O.yH3PO4 precursor and activated in the reaction mixture at temperatures up to 500 °C. In the catalysts prepared by the above procedure, the tendency to the formation of phases of higher-condensed phosphates, in particular VO(PO3)2 or even V(PO3)3, increases with increasing n(P):n(V) ratio and is then more pronounced than with vanadium-phosphorus catalysts prepared by other procedures. The tendency to the formation of the catalytically less active condensed phosphates is partly suppressed by the embedding of modifying metal cations (Fe or Cu in this case).

Enzymatic degradation and assimilation of condensed phosphates by green algae

1967 ◽  
Vol 1 (5) ◽  
pp. 335-350 ◽  
Author(s):  
Ernst M. Davis ◽  
Maxwell J. Wilcomb
Keyword(s):  
Green Algae ◽  
Enzymatic Degradation ◽  
Condensed Phosphates

scholarly journals CHEMICAL PREPARATION AND CRYSTAL DATA FOR TWO CONDENSED PHOSPHATES NiCs4(PO3)6 AND NiK4(P3O9)2

2003 ◽  
Vol 16 (0) ◽  
pp. 107-111 ◽  
Author(s):  
KACEM SBAI ◽  
AZEDDINE ATIBI ◽  
ABDELKEBIR KENZ ◽  
ELMOSTAFA TACE ◽  
MALIKA TRIDANE
Keyword(s):  
Crystal Data ◽  
Chemical Preparation ◽  
Condensed Phosphates

scholarly journals Thermal properties of metal-metal bonded Pd(I) complexes supported onto porous Vycor glass

2008 ◽  
Vol 80 (2) ◽  
pp. 263-269
Author(s):  
Iara F. Gimenez ◽  
Oswaldo L. Alves
Keyword(s):  
Solid State ◽  
Thermal Stabilization ◽  
Decomposition Products ◽  
Vycor Glass ◽  
X Ray ◽  
Porous Vycor Glass ◽  
Metal Metal ◽  
Condensed Phosphates ◽  
Diffuse Reflectance Infrared ◽  
Immobilized Complexes

Thermal behavior of the complexes Pd2(dppm)2Cl2, Pd2(dppm)2(SnCl3)Cl and Pd2(dppm)2(SnCl3)2 (dppm = bis[diphenylphosphino(methane)], ((C6H5)2PCH2P(C6H5)2) in the solid state and immobilized onto porous Vycor glass was studied. Similar decomposition mechanisms were observed for the solid and immobilized complexes, with a small thermal stabilization upon immobilization. The decomposition products were characterized by X-ray diffractometry, Raman and diffuse reflectance infrared spectroscopy, which indicated the presence of a mixture of metallic palladium and oxidized species such as PdO,condensed phosphates, SnO2 and SnP2O7. According to X-ray diffractometry, the decomposition products of the immobilized complexes presented higher amounts of PdO than the solid-state residues, probably as an effect of interactions with silanol groups present in the glass surface.

scholarly journals Separation of Condensed Phosphates by Paper Chromatography

1960 ◽  
Vol 81 (10) ◽  
pp. 1626-1627 ◽  
Author(s):  
Seiichiro UTSUMI ◽  
Masako SHIMA
Keyword(s):  
Paper Chromatography ◽  
Condensed Phosphates

Phosphorus Speciation in Water and Sediments

1999 ◽  
Vol 71 (11) ◽  
pp. 2161-2176 ◽  
Author(s):  
B. Ya. Spivakov ◽  
T. A. Maryutina ◽  
H. Muntau
Keyword(s):  
High Performance Liquid Chromatography ◽  
High Performance ◽  
Waste Waters ◽  
Phosphorus Speciation ◽  
Phosphorus Species ◽  
Spectrophotometric Methods ◽  
Condensed Phosphates ◽  
Automatic Methods ◽  
Lower Oxidation

Environmentally significant phosphorus species in water and phosphorus fractions in sediments are briefly discussed and the methods for their determination are described. One of the most critical analytical steps is the separation of the different forms which, after conversion into orthophosphates, may be determined by a multitude of various techniques. Spectrophotometric methods are often preferred for routine analysis. Several rapid automatic methods for the separation and determination of orthophosphate, linear polyphosphates, cyclic condensed phosphates and lower oxidation state anions of phosphorus, which may exist in natural and waste waters, have been developed. They are mainly based on the use of flow-injection analysis, high-performance liquid chromatography including ion chromatography, capillary electrophoresis and a few of other techniques. These methods have been described and critically evaluated.

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