Cox A J, Harries J E, Hukins D W, Kennedy A P, Sutton T M
Br J Urol. 1987 Feb;59(2):159-63. doi: 10.1111/j.1464-410x.1987.tb04810.x.
Encrusted catheters from nine female patients were the source of samples of deposits which were examined by X-ray diffraction, atomic absorption spectroscopy, infra-red spectroscopy and extended X-ray absorption fine structure (EXAFS) spectroscopy. In eight samples the only crystalline phase which could be clearly distinguished by X-ray diffraction was ammonium magnesium orthophosphate hexahydrate, NH4MgPO4 X 6H2O, which occurs naturally as the mineral struvite. However, atomic absorption spectroscopy revealed an appreciable concentration of calcium in all samples. Calcium phosphates have previously been detected in catheter deposits. Infra-red and EXAFS spectra were consistent with the calcium phosphate being present as a poorly crystalline hydroxyapatite. Thus the deposits appear to consist of a mixture of crystalline struvite and a form of hydroxyapatite which is not fully crystalline.
来自9名女性患者的结痂导管是沉积物样本的来源，这些沉积物样本通过X射线衍射、原子吸收光谱、红外光谱和扩展X射线吸收精细结构（EXAFS）光谱进行了检查。在8个样本中，通过X射线衍射能够清晰区分的唯一晶相是六水合磷酸镁铵，NH4MgPO4·6H2O，它作为鸟粪石矿物天然存在。然而，原子吸收光谱显示所有样本中钙的浓度都相当可观。先前在导管沉积物中已检测到磷酸钙。红外光谱和EXAFS光谱与磷酸钙以结晶度差的羟基磷灰石形式存在一致。因此，这些沉积物似乎由结晶鸟粪石和一种不完全结晶的羟基磷灰石形式的混合物组成。
