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Determination of fluoride ion in animal bone by microdiffusion analysis.

A microdiffusion analysis method for the determination of fluoride ion in animal bone sample was established by using a new diffusion cell. The cell is equipped with a water jacket to control the temperature. The space inside the cell is divided by a crossed-beam stand into top and bottom parts. In the bottom part, derivatization of fluoride ion to trimethylfluorosilane (TMFS) by hexamethyldisiloxane as the reagent occurs, with the volatile TMFS being absorbed into alkali placed in an open-top cup supported by the stand. The cell is placed on a magnetic stirrer to rotate the stirring bars in both reaction and absorption solutions. Stirring and elevation of temperature increase the reaction rates. Maintaining the cell at 40 degrees C for 3 h is sufficient for complete extraction of fluoride ion from the bone and its recovery. With our method, more than 10 micrograms/g of fluoride ion in bone can be assayed with a coefficient of variation of less than 3%. The fluoride levels of various rat bones were clarified.