Is apatite calcium phosphate?
Apatites are phosphate minerals, and it is the association of the calcium ions that is responsible for the characteristic hexagonal crystal structure and morphology.
Does apatite have calcium?
Apatite (Fig. 1.12) is a group of natural calcium mineral±fluorine and chlorine (Ca5(PO4)3(F, Cl, OH)). The mineral primarily occurs as phosphate rock.
What is apatite chemical composition?
Apatite has the composition Ca5[PO4]3(OH,F,Cl) and is the major primary mineral source of phosphorous to most soils. It has a hexagonal crystal system and variable composition.
Does apatite react with acid?
During the reaction between strong acid and phosphate rock, the acid reacts with the main constituents of the phosphate rock such as apatite. In the case of dilute hydrochloric acid the present results show that it may be a promising leaching agent for beneficiation of carbonatic and/or dolomitic phosphates.
Is hydroxyapatite a calcium phosphate?
Hydroxyapatite (HAP) has been widely used in bone regeneration. It is a naturally occurring form of calcium phosphate that constitutes the largest amount of inorganic components in human bones [63]. The chemical formula of HAP is Ca10(PO4)6(OH)2 with a Ca/P ratio of 1.67 [52, 64].
What will dissolve calcium phosphate?
Hope this helps, Answer 2: Tooth enamel is primarily made up of hydroxyl apatite, which is a crystalline calcium phosphate. Acetic acid is a weak acid that will act in just this way to dissolve the apatite materials in your teeth.
Is apatite a fertilizer?
Apatite is the main source of phosphorous, an important nutrient required by plants. As such, apatite is the key ingredient in phosphate fertilizers. Most of the phosphorus used in fertilizer comes from phosphate rock, which is mined almost exclusively for this application.
Why is apatite used in fertilizer?
How do you prevent carbonate apatite stones?
Struvite stones, also called “infection stones” or Mg-NH4+ carbonate-apatite stones, only form when urease-producing bacteria are present in the upper urinary tract, Dr. Curhan noted. Complete stone removal is required, and further stones can be prevented by preventing urinary tract infections (UTIs), he said. Dr.
How to synthesize single phased calcium phosphate apatites?
Discussion The synthesis of single phased calcium phosphate apatites with variable Ca/P atomic ratio within the range 1.50–1.667 can be performed by the precipitation method with a good reproducibility. These powders (Ca-dHAP) can be processed by temperature and pH regulation.
What is the Ca/P ratio of calcium phosphate compounds?
On these bases, our work is concerned with a more systematic approach of calcium phosphate compounds having a Ca/P molar ratio between 1.50 and 1.667. The present paper is the first part of a three-part study.
Is it possible to synthesise compounds with a high Ca/P ratio?
Using this method, it was possible to synthesise compounds having a Ca/P ratio ranging from 1.511 to 1.663. For these synthesis conditions, a good reproducibility was achieved since the powders could be processed with a relative deviation of their Ca/P value inferior to 1%.
Is there a pure apatitic tricalcium phosphate?
Pure apatitic tricalcium phosphate has not been obtained in our experiment, the closest value being 1.511. Though the relative deviation between these two values was low (about 0.7%), such compositions could be differentiated between them because of the precision of the determination of Ca/P values.