Present Condition of Fluoridation in São Paulo and Piracicaba in Brazil
1992 Volume 42 Issue 3 Pages 399-405
Details
1992 Volume 42 Issue 3 Pages 399-405
The special service of public health sponsored by the Brazilian government began the fluoridation of water in Baixo Guandu, a small town in the state of Espirito Santo in 1953. In a survey done by the FDI in 1981, 7, 500, 000 inhabitants were drinking fluoridated water in 122 communities. Although so many people are drinking fluoridated water in Brazil, the present condition of fluoridation in Brazil is not known in Japan. For this reason we conducted an investigation of the water supply in São Paulo, Piracicaba, and other cities.
1. The water in São Paulo has been fluoridated to 0.7ppm with 25% H2SiF6 since 1985. Recovery rate of fluoride in tap water was 82.7%.
2. The water in Piracicaba has been fluoridated to 0.7ppm with Na2SiF6 since 1971. Recovery rate of fluoride in tap water was 99.6%.
3. We measured the anion levels (F-, Cl-, NO3-, SO42-) in the drinking water of several large cities. We found artificial fluoride in the drinking water of Belem, Iguacu, and Ferraz de Vasconcelous.
4. We compared the public water allowance for fluoride concentration in Japan, Brazil and WHO. The Japanese allowance is 1/2 of that of Brazil and WHO.
