Purity test of precipitated apatites by TG/DTA/EGA–MS

• Published in: Journal of thermal analysis and calorimetry Vol. 125; no. 2; pp. 919 - 925
• Main Authors: Tõnsuaadu, Kaia, Bogdanoviciene, Irma, Traksmaa, Rainer
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01-08-2016; Springer
• Subjects: Analysis; Analytical Chemistry; Apatites; Chemistry; Chemistry and Materials Science; Infrared spectroscopy; Inorganic Chemistry; Mass spectrometry; Measurement Science and Instrumentation; Phosphate minerals; Physical Chemistry; Polymer Sciences; X-ray diffraction; Zinc compounds; Purity test; Precipitated hydroxyapatite; TG–DTA–EGA–MS
• ISSN: 1388-6150; 1588-2926
• DOI: 10.1007/s10973-016-5447-1

Pure Ca hydroxyapatites (CaHAp) and Na-, Mg-, Zn- and Sr-substituted precipitated apatites were characterized by X-ray diffraction analysis, Fourier transformed infrared spectroscopy and element, chemical, and TG/DTA–EGA–MS analysis at their heating up to 1200 °C in Ar atmosphere. The evolvement of H
2
O, CO
2
, NH
3,
and N
x
O
y
was followed by mass spectroscopy (MS). Comparison of thermal behavior of pure CaHAps and cation-substituted apatites indicates that the exact temperatures of the release of gases (thermal stability) depend strongly on the chemical composition and crystallinity of sample. The presence of nitrogen species was detected by TA–MS in all precipitated apatites, and its content (0.01–1 %) depends on the synthesis conditions, the washing profoundness as well as on the cationic composition of apatite.