title: [Composition and thermal stability of traditional Tibetan mineral medicine Nanhanshuishi].
abstract: OBJECTIVE
  To determine the composition, structure, trace elements and thermal stability of Tibetan medicine Nanhanshuishi.
  
  
  METHODS
  The trace elements, the structure, and the thermal stability of Nanhanshuishi were assayed and calculated by X-ray fluorescence spectrometry (XRF), inductively coupled plasma optical emission spectrometer (ICP-OES), atomic fluorescence spectrometry (AFS), inductively coupled plasma mass spectrometry (ICP-MS), X-ray power diffraction (XRD), TG-DTA.
  
  
  RESULTS
  The results indicated that the phase is mainly made up of CaCO3 (Rhombohedral, R-3c) in Nanhanshuishi. The analysis of elements show that Nanhanshuishi is rich in Ca and O, and contains other more than 20 minor elements, such as Si, Mg, Fe, Al, Na, K, Zn, Mn, Pb, As, Hg etc. The result of TG-DTA show that the weight of Nanhanshuishi starts to decline from near 700 degrees C and get steady above 850 degrees C.
  
  
  CONCLUSIONS
  The study provided scientific data for the establishment of quality standards of Tibetan medicine Nanhanshuishi.
authors.affiliation: Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China.
authors.forename: Zhengxiang
authors.initials: Z
authors.lastname: Quan
authors.forename: Lixin
authors.initials: L
authors.lastname: Wei
authors.forename: Yuzhi
authors.initials: Y
authors.lastname: Du
authors.forename: Cen
authors.initials: C
authors.lastname: Li
authors.forename: Hongxia
authors.initials: H
authors.lastname: Yang
mesh_terms: D004355:Drug Stability; D013058:Mass Spectrometry; D038861:Medicine, Tibetan Traditional; D008903:Minerals; D013052:Spectrometry, X-Ray Emission; D013054:Spectrophotometry, Atomic; D014131:Trace Elements / Q000032:analysis
chemical_list: D008903:Minerals; D014131:Trace Elements