Genesis, Characteristics and Prespecting Marks of Phosphorus Deposits in Huaning, Yunnan Province

2013 ◽  
Vol 868 ◽  
pp. 96-100
Author(s):  
Feng Pan ◽  
Guang Zhi Meng ◽  
Yong Feng Yan ◽  
Jian She Wang
Keyword(s):  
Calcium Phosphate ◽  
Phosphate Rock ◽  
Yunnan Province ◽  
Interstitial Water ◽  
Ph Value ◽  
Phosphate Concentration ◽  
Cause Of Formation ◽  
Phosphate Deposits

This article mainly analyzed and discussed the origin of exposed phosphate rock mine in Huaning area.We preliminary think the ore was started from basin phosphate deposits in the early and get rich from transportation and modification by the water repeatedly.Also at the diagenesis phase ,the Eh value is lower and Ph value is higher which makes phosphate concentration of interstitial water higher.With the affection of rich phosphorus interstitial water,the sediment get further phosphatization and makes the rock more rich.At the same time ,the calcium phosphate of intergranular water cements particles what makes the apatite has the characteristics of girdles.The analyzation leads that the cause of formation of phosphorus deposits in this area was sedimentation and modification.

The use of thermal printing to control the properties of calcium phosphate deposits

Biomaterials ◽  
2010 ◽  
Vol 31 (25) ◽  
pp. 6386-6393 ◽  
Author(s):  
Saeed Saber-Samandari ◽  
Kārlis A. Gross
Keyword(s):  
Calcium Phosphate ◽  
Phosphate Deposits

Primary Study of an Injectable In Situ Composite of Collagen/Calcium Phosphate Porous Scaffold for Bone Substitute

2006 ◽  
Vol 309-311 ◽  
pp. 857-860 ◽  
Author(s):  
Q. Yao ◽  
Dong Xiao Li ◽  
K.W. Liu ◽  
Bo Zhang ◽  
H. Li ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Calcium Phosphate ◽  
Ph Value ◽  
Porous Scaffold ◽  
Setting Time ◽  
Primary Study ◽  
In Situ Composite ◽  
Setting Process ◽  
Main Material

This study was to develop an injectable biocompatible and porous calcium phosphate collagen composite cement scaffold by in situ setting. TTCP was prepared as main material of the CPC powder, and the collagen solution was added into the phosphoric acid directly to form the liquid phase. The injectable time (tI), setting time (tS) and setting temperature (TS), along with the PH value were recorded during the setting process. The compressive strength, morphology and porosity were tested. With the increase of collagen, this novel CPC get a tI of 5mins to 8mins, tS of 20mins to 30mins, compressive strength from 1.5MPa to 4MPa, and the porosity from 40% to 60%. This study gave a possibility to form a porous scaffold of collagen/CPC composite with the nature of injectability and setting in situ.

Decrease of phosphate concentration in a high rate pond by precipitation of calcium phosphate: Theoretical and experimental results

1992 ◽  
Vol 26 (11) ◽  
pp. 1445-1450 ◽  
Author(s):  
T. Moutin ◽  
J.Y. Gal ◽  
H. El Halouani ◽  
B. Picot ◽  
J. Bontoux
Keyword(s):  
Calcium Phosphate ◽  
Phosphate Concentration ◽  
Experimental Results ◽  
High Rate

The formation of intravesicular calcium phosphate deposits in microsomes of smooth muscle

1981 ◽  
Vol 70 (2) ◽  
pp. 139-150 ◽  
Author(s):  
L. Raeymaekers ◽  
B. Agostini ◽  
W. Hasselbach
Keyword(s):  
Smooth Muscle ◽  
Calcium Phosphate ◽  
Phosphate Deposits

Calcium phosphate deposits in domes of human pancreatic adenocarcinoma (Capan-1) cell cultures

1990 ◽  
Vol 69 (3) ◽  
pp. 191-203 ◽  
Author(s):  
Etienne Hollande ◽  
Jean-He´le`ne Levrat Donato ◽  
Marjorie Fanjul ◽  
Claude Palevody ◽  
Marguerite Daumas ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Pancreatic Adenocarcinoma ◽  
Cell Cultures ◽  
Human Pancreatic Adenocarcinoma ◽  
Phosphate Deposits

scholarly journals The protective effect of supplemental calcium on colonic permeability depends on a calcium phosphate-induced increase in luminal buffering capacity

2011 ◽  
Vol 107 (7) ◽  
pp. 950-956 ◽  
Author(s):  
Marloes A. A. Schepens ◽  
Sandra J. M. ten Bruggencate ◽  
Arjan J. Schonewille ◽  
Robert-Jan M. Brummer ◽  
Roelof van der Meer ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Protective Effect ◽  
Intestinal Permeability ◽  
Buffering Capacity ◽  
Phosphate Concentration ◽  
Dietary Adaptation ◽  
Supplemental Calcium ◽  
Dietary Phosphate ◽  
Lactate Levels ◽  
High Phosphate

An increased intestinal permeability is associated with several diseases. Previously, we have shown that dietary Ca decreases colonic permeability in rats. This might be explained by a calcium-phosphate-induced increase in luminal buffering capacity, which protects against an acidic pH due to microbial fermentation. Therefore, we investigated whether dietary phosphate is a co-player in the effect of Ca on permeability. Rats were fed a humanised low-Ca diet, or a similar diet supplemented with Ca and containing either high, medium or low phosphate concentrations. Chromium-EDTA was added as an inert dietary intestinal permeability marker. After dietary adaptation, short-chain fructo-oligosaccharides (scFOS) were added to all diets to stimulate fermentation, acidify the colonic contents and induce an increase in permeability. Dietary Ca prevented the scFOS-induced increase in intestinal permeability in rats fed medium- and high-phosphate diets but not in those fed the low-phosphate diet. This was associated with higher faecal water cytotoxicity and higher caecal lactate levels in the latter group. Moreover, food intake and body weight during scFOS supplementation were adversely affected by the low-phosphate diet. Importantly, luminal buffering capacity was higher in rats fed the medium- and high-phosphate diets compared with those fed the low-phosphate diet. The protective effect of dietary Ca on intestinal permeability is impaired if dietary phosphate is low. This is associated with a calcium phosphate-induced increase in luminal buffering capacity. Dragging phosphate into the colon and thereby increasing the colonic phosphate concentration is at least part of the mechanism behind the protective effect of Ca on intestinal permeability.

Optimization of Crystallization of Magnesium Ammonium Phosphate: Initial Phosphate Concentration, PH and Reactants Molar Ratio

2013 ◽  
Vol 295-298 ◽  
pp. 1289-1292 ◽  
Author(s):  
Kai Huang ◽  
Li Ping Qiu ◽  
Jin Feng Meng ◽  
Dong Wang
Keyword(s):  
Ph Value ◽  
Removal Rate ◽  
Ammonium Phosphate ◽  
Xrd Analysis ◽  
Phosphate Concentration ◽  
Phosphate Removal ◽  
Molar Ratio ◽  
Septic Tank ◽  
Magnesium Ammonium Phosphate ◽  
Magnesium Ammonium

By- products are widespread in the crystallization of magnesium ammonia phosphate (MAP) as the differences in reactive conditions which effects the forms and habits of crystals. The study focused on the supernatant from septic tank in order to achieve in-situ treatment. Based on the effluent, the optimization research of initial phosphate concentration and pH was investigated by using single factor analysis. The crystal products with different reaction condition were also characteristiced through the XRD analysis. The experimental results showed that the optimum reactants molar ratio of n(NH4+):n(Mg2+):n(PO43-) were 90:25:1, 4:1.6:1 and 3:1.4:1 when pH value was 9.5 with initial phosphate concentration 8mg/L, 50mg/L and 100mg/L, respectively. It was also observed that the phosphate removal rate increased with increasing the initial phosphate concentration or pH value. As the aging time increased, the removal rate was in parabolic curve with 30 minute at the highest point. The XRD analysis revealed that the best MAP crystal could be produced with initial phosphate concentration 50mg/L and pH 9.0.

In Vitro Dissolution Behavior of Biphasic Tricalcium Phosphate Composite Powders Composed of α-Tricalcium Phosphate and β-Tricalcium Phosphate

2008 ◽  
Vol 368-372 ◽  
pp. 1206-1208 ◽  
Author(s):  
Yan Bao Li ◽  
Dong Xu Li ◽  
Wen Jian Weng
Keyword(s):  
Heat Treatment ◽  
Calcium Phosphate ◽  
Tricalcium Phosphate ◽  
Amorphous Calcium Phosphate ◽  
Ph Value ◽  
In Vitro Dissolution ◽  
Dissolution Behavior ◽  
Buffer Solution ◽  
Composite Powders

Biphasic tricalcium phosphate (BTCP) powders composed of α-tricalcium phosphate (α-TCP) and β-tricalcium phosphate (β-TCP) were prepared using amorphous calcium phosphate (ACP) precursor after heat treatment at 800oC. The in vitro dissolution behavior of the powders was examined after soaked in 0.1M NaAc-HAc buffer solution for different times. It was revealed that the Ca2+ and PO4 3- concentration, and pH value of the BTCP-soaked solution are higher than those of the α-TCP- and β-TCP-soaked solutions. The dissolution behavior of BTCP powders was explained. The specific dissolution behavior of BTCP powders can widen the biodegradation range of calcium phosphate family.

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