title: Fluoride Content of Bottled Waters in Hong Kong and Qatar.
abstract: OBJECTIVE
  To determine the F concentration of bottled waters that was available in Hong Kong and Qatar.
  
  
  METHODS
  The F concentrations of bottled waters collected from Hong Kong (n=81) and Qatar (n=32) were analysed. The F ion selective electrode method was used to measure the F concentration in the samples. Three measurements were obtained for every sample to ensure reproducibility and appropriate statistical analyses were employed.
  
  
  RESULTS
  Qatar group: F concentrations ranged from 0.06 ppm to 3.0 ppm with a mean value of 0.8 ppm. The F concentrations displayed on the labels of the samples (60%) were significantly lower than the measured F concentration (p < 0.0001). Hong Kong group: F concentrations ranged from 0.04 ppm to 2.52 ppm with a mean value of 0.44 ppm. The F concentrations displayed on the samples (16%) were significantly lower than the measured F concentration (p< 0.0001).
  
  
  CONCLUSIONS
  Wide variations exist in the F concentration among the different brands of bottled water available in Hong Kong and Qatar. The F concentrations displayed on the labels were not consistent with the measured F concentrations.
authors.forename: Hessa I
authors.initials: HI
authors.lastname: Al-Mulla
authors.forename: Robert P
authors.initials: RP
authors.lastname: Anthonappa
authors.forename: Nigel M
authors.initials: NM
authors.lastname: King
mesh_terms: D002138:Calibration; D060766:Drinking Water / Q000737:chemistry*; D004566:Electrodes; D005459:Fluorides / Q000032:analysis*; D006723:Hong Kong; D011780:Qatar
chemical_list: D060766:Drinking Water; D005459:Fluorides
keywords: bottled water; dental caries; fluoride; fluorosis