title: [Evaluating the uncertainty in urinary fluoride measurement by ion selective electrode method].
abstract: OBJECTIVE
  To evaluate the uncertainty of measurement result of urinary fluoride and to provide quality assurance for determinations.
  
  
  METHODS
  The investigation was conducted, according with principles and methods for uncertainty evaluation.
  
  
  RESULTS
  The uncertainty of the combined standard of present method was 2.86 %. For the sample containing 4.47 mg/L urinary fluoride, the expanded uncertainty was 0.26 mg/L.
  
  
  CONCLUSIONS
  The uncertainty of the present method was mainly from the sample repeatability, the preparation of standard solution, the linearity of the calibration curve and instruments and so on.
authors.affiliation: Tianjin Centers for Disease Control and Prevention, Tianjin 300011, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
authors.forename: Shu-lan
authors.initials: SL
authors.lastname: Zhao
authors.forename: Wan-chao
authors.initials: WC
authors.lastname: Zhang
mesh_terms: D005459:Fluorides / Q000652:urine*; D017736:Ion-Selective Electrodes / Q000592:standards*; D011786:Quality Control; D035501:Uncertainty; D016482:Urinalysis / Q000379:methods*
chemical_list: D005459:Fluorides