期刊
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
卷 32, 期 2, 页码 147-163出版社
SPRINGER
DOI: 10.1007/s10653-009-9271-4
关键词
Groundwater; Fluoride provenance; Optimal dose; Fluorosis; Mayo Tsanaga River Basin
类别
资金
- MEXT (The Japanese Ministry of Education, Science, Sports and Culture)
- Sasagawa foundation, Japan [20-626]
The 500,000 inhabitants of Mayo Tsanaga River Basin are vulnerable to a silent fluorosis from groundwater consumption. For the first time, the groundwater is investigated for the purpose of identifying the provenance of fluoride and estimating an optimal dose of fluoride in the study area. Based on the fluoride content of groundwater, fluorine and major oxides abundances in rocks from the study area, mean annual atmospheric temperature, and on-site diagnosis of fluorosis in children, the following results and conclusions are obtained: Fluoride concentration in groundwater ranges from 0.19 to 15.2 mg/l. Samples with fluoride content of < 1.5 mg/l show Ca-HCO3 signatures, while those with fluoride > 1.5 mg/l show a tendency towards Na-HCO3 type. Fluor-apatite and micas in the granites were identified as the main provenance of fluoride in the groundwater through water-rock interactions in an alkaline medium. The optimal fluoride dose in drinking water of the study area should be 0.7 mg/l, and could be adjusted downward to a level of 0.6 mg/l due to the high consumption rate of groundwater, especially during drier periods.
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