THE WET METHOD OF SYNTHESIZING HYDROXYAPATITE FROM AQUEOUS SOLUTIONS AT VARIOUS pH RANGES WHICH MADE ORGANISM TEMPERATURE MAIN

Abstract

Hydroxyapatite was formed by the extremely slow addition of diammonium hydrogenphosphate to a solution of calcium nitrate at pH9 buffered with ethylenediamine at 36.5°C. The Ca/P molar ratio in the precipitate yielded was measured by inductively coupled plasma atomic emission spectrometry and the condition of the crystals was examined by X-ray diffraction. This synthetic apatite was compared with human tooth and bones from cattle and pigs. The crystallization condition and Ca/P molar ratio were extremely similar to those of human tooth.