Concentrations of fluoride in wines from the Canary Islands

Potentiometry using an ion-selective electrode has widely been used for det ermining fluoride because of its simplicity and rapidity. The concentration of fluoride was determined (Gran's method) in 70 wines from the main wine- producing regions of the Canary Islands. The mean concentration of fluoride in wines from a region with a high concentration of fluoride in drinking w aters was significantly (p < 0.05) higher than those mean concentrations ob tained in the remaining wines. Non-important differences were found among t he types of wine analysed. However, the fluoride concentrations of all the Canarian wines analysed here did not present a risk for the public health.