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Environmental fluoride content in Tibet.

C Jin1, Z Yan, L Jianwei

  • 1Tea and Health Laboratory, Hunan Medical University, Changsha, People's Republic of China. caojin@public.cs.hn.cn

Environmental Research
|August 16, 2000
PubMed
Summary
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This study reports the first environmental fluoride levels in Tibet, finding high concentrations in brick tea. These findings suggest brick tea consumption is a primary cause of fluorosis in the region.

Area of Science:

  • Environmental Science
  • Public Health
  • Analytical Chemistry

Background:

  • Tibet's unique environment and population warrant investigation into local fluoride exposure.
  • Understanding environmental fluoride is crucial for assessing public health risks, particularly for endemic diseases like fluorosis.

Purpose of the Study:

  • To determine the environmental fluoride levels across various sources in Tibet.
  • To investigate the relationship between fluoride intake and the prevalence of brick tea fluorosis in the Tibetan population.

Main Methods:

  • Fluoride concentration was determined using the fluoride ion-selective electrode method.
  • Analysis included water, soil, fuel, grains, food, vegetables, and various types of tea.

Main Results:

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  • Average fluoride levels were 0.06 mg/L in water, 0.45 mg/kg in soil, and 0.10 mg/kg in fuels.
  • Fluoride in grains, food, and vegetables ranged from 0.06-0.33 mg/kg.
  • Significantly higher fluoride levels were found in Tibetan buttered tea (3.09-3.61 mg/kg) and brick tea (533.89-617.32 mg/kg).

Conclusions:

  • Tibet is identified as a prevalent area for brick tea-induced fluorosis.
  • High fluoride content in brick tea is a major contributor to fluorosis among the Tibetan people.
  • Further public health interventions are recommended to mitigate fluoride exposure from dietary sources.