文摘
柠檬酸的作用、铁和铝离子的结晶磷酸盐在不同pH值(6.5、7、8)
作者(年代):Aissa Belouatek和艾哈迈德Addou钙磷酸盐代表一个复杂的家庭。他们的结晶条件和抑制进行了研究在不同pH值。磷酸盐沉淀获得人工尿液pH值范围(6.5;7;8)被确定使用红外光谱和x射线衍射。在pH = 6.5透钙磷石碳酸的陪同下无定形磷酸复合物沉淀在pH = 7,透钙磷石的共存,鸟粪石和无定形磷酸复合物碳酸观察。另一方面碳酸磷灰石和鸟粪石形成专门在pH = 8。透钙磷石晶体的完整消失后获得的1毫米的柠檬酸盐离子在人工尿液pH = 6.5。它对鸟粪石的影响更重要在pH = 7, pH值抑制也就完成了。总透钙磷石只是观察到抑制柠檬酸盐离子的浓度4毫米。在低浓度抑制部分。 At the same pH, pentahydrated octocalcic phosphates (POP) and amorphous carbonated calcium phosphates (ACCP) were formed as identified by FTIR spectroscopy. In the presence of aluminium ion, the inhibition of brushite growth and aggregation increased. In fact at a concentration of 0.05 mM the formation of bushite crystals was halted but ACC P persisted. The addition of up to a concentration of 1 mM of ion aluminium resulted in total inhibition and crystalline transformation of the ACCP into withlockite. On the other hand, the effect of ferric ion was less important than that of aluminium ion at pH = 6.5. However, inhibition was total with a concentration of 0.1 mM ferric ion where ACCP and POP were the only compounds formed. The total disappearance of the crystalline forms was attained with a ferric ion concentration of 0.5 mM, while amorphous carbonated calcium phosphate and the carbapatite precipitated. For the iron III ion, total disappearance of brushite was reached at 0.25 mM, only the ACCP and POP were present. The inhibition effect of citrate, aluminium, and ferric ions on the aggregation and size of struvite crystals was significant at pH=8 but inhibition and transformation of this crystalline species were not complete. ï 2006 Trade Science Inc. - INDIA
