کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
674485 | 1459563 | 2011 | 4 صفحه PDF | دانلود رایگان |
Thermogravimetry combined with evolved gas mass spectrometry has been used to ascertain the stability of the ‘cave’ mineral brushite. X-ray diffraction shows that brushite from the Jenolan Caves is very pure. Thermogravimetric analysis coupled with ion current mass spectrometry shows a mass loss at 111 °C due to loss of water of hydration. A further decomposition step occurs at 190 °C with the conversion of hydrogen phosphate to a mixture of calcium ortho-phosphate and calcium pyrophosphate. TG-DTG shows the mineral is not stable above 111 °C. A mechanism for the formation of brushite on calcite surfaces is proposed, and this mechanism has relevance to the formation of brushite in urinary tracts.
► In this study the thermal stability of brushite is reported.
► Such a study is relevant to the elimination of renal canal stones.
► A mechanism for the formation of brushite is proposed.
► A mechanism for the decomposition of brushite is discussed.
► This research has implications for the control and removal of kidney stones.
Journal: Thermochimica Acta - Volume 521, Issues 1–2, 10 July 2011, Pages 14–17