RESUMO
The solubility product of fluorapatite has been determined by equilibrating a very pure mineral specimen in KCl solutions at ionic strengths up to 0.1. At pH's less than 5.0 to 6.0 the solubility product of fluorite, and not that of fluorapatite, is the governing principle under the experimental conditions used.
Assuntos
Apatitas/metabolismo , Cálcio/metabolismo , Flúor/metabolismo , Concentração de Íons de Hidrogênio , Tamanho da Partícula , Fósforo/metabolismo , Solubilidade , Fatores de TempoRESUMO
In the beginning, the preparations and doing the graphics will take time, and the process will appear to be slow and tedious. Good graphics take time. However, the time will be lessened considerably when you have more hands-on experience. Graphics must be direct, simple, clear, and accurate. Preview and proof your graphics before production. For quick legibility preview, view your graphic at a distance of eight times the width of the graphic image. If you cannot read it, the audience will not be able to either. Be sure all lines are solidily inked and in proportion to the intended visual. Master one technique before expanding to others. Learn to visualize the end result of a rough draft. This will save you many redos and fewer changes later on. Finally, condition yourself to accept constructive critiques on your work, especially from graphics professionals and co-professionals. It may be an excellent way to improve the quality of your future presentations.
Assuntos
Recursos Audiovisuais , Materiais de Ensino , Arte , Matemática , Fotografação/instrumentaçãoRESUMO
On the assumption that the calcium orthophosphates dissolve stoichiometrically, the solubility of Hap, Fap, DCPD, OCP and TCP, as well as of CaCO3 and CaF2, have been calculated in terms of grams of solid phase per liter under equilibrium conditions. As exemplified in the text, these calculated solubilities facilitate the understanding of the complex behavior of the orthophosphates when in solution.