title: [Determination of metal elements in Achyranthis bidentatae radix from various habitats].
abstract: OBJECTIVE
  To establish an atomic absorption spectrometry method for determination of the contents of metal elements in Achyranthis Bidentatae Radix and analyze 21 batches of samples from different areas.
  
  
  METHODS
  Fe, Mn, Ca, Mg, K, Zn and Cu were detected by atomic absorption spectrometry with hydrogen flame detector, Pb, As and Cd were detected by graphite furnace atomic absorption, Hg was detected by cold atomic absorption.
  
  
  RESULTS
  The heavy metal contents met the requirement of Chinese Pharmacopoeia. The contents of K, Mg, Cu and Mn in the samples of geo-authentic areas were higher,while the contents of Fe, Zn, Hg and Pb in the samples of non-authentic areas were higher.
  
  
  CONCLUSIONS
  This method is sample, accurate, repeatable and could be used to evaluate the quality of Achyranthis Bidentatae Radix.
authors.affiliation: Henan Academy of TCM, Zhengzhou 450004, China. wqtu632@yahoo.com.cn
authors.forename: Wan-Qian
authors.initials: WQ
authors.lastname: Tu
authors.forename: Liu-Ji
authors.initials: LJ
authors.lastname: Zhang
mesh_terms: D029044:Achyranthes / Q000737:chemistry* / Q000254:growth & development; D017753:Ecosystem; D008670:Metals / Q000032:analysis*; D019216:Metals, Heavy / Q000032:analysis; D008872:Microwaves; D018517:Plant Roots / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry / Q000254:growth & development; D011786:Quality Control; D015203:Reproducibility of Results; D013054:Spectrophotometry, Atomic / Q000379:methods*
chemical_list: D008670:Metals; D019216:Metals, Heavy