Nedeljković M, Antonijević B, Matović V
Department of Toxicological Chemistry, School of Pharmacy, University of Belgrade, Yugoslavia.
Analyst. 1991 May;116(5):477-8. doi: 10.1039/an9911600477.
A simple and rapid preparation method for the determination of fluoride in biological materials (blood and food) of various origins, is described. A homogenized sample was placed in a plastic diffusion cell and calcium phosphate added, it was then dried at 55 degrees C and treated with 70% HClO4 and 40% AgClO4. After digestion for 24 h at 55 degrees C, the fluorides released were fixed on the upper part of a diffusion cell containing a thin layer of NaOH. The analyses of the diffused fluoride were carried out with an ion-selective electrode. The proposed microdiffusion method, without mineralization, enables quantitative separation of the fluoride from the biological samples.
