Has anybody had problems with the commercial TISAB in Taves method modified by Whitford?
I think that ion selective electrode for fluorine. This electrode in made with cristal of lanthanum doped with europium. Its sensibility is 10^-6 mol/L. But I don't know wihich is the fluorine concentration in nail clippings. Can be necessary pre-concentration.
The best methods for fluoride determination in any media are ICP-MS and Ion-Selective Electrodes (ISE). However, for larger concentrations, AAS with graphite furnace can also be used. Colorimetric/Titrimetirc analyses for fluoride give very crude values and are not suggested for minor elements like fluoride. If you go for ISE, better to go for the combination ISE rather than half-cell ISE.
The SPADNS colorimetrc method is suitable for solving the purpose, because it is based on the reaction between fluoride and a zirconium-dye lake. Fluoride reacts with the dye lake, dissociating a portion of it into a colourless anionic complex.
In the in the modification of Whitford, the best way to measure fluoride in nail is by indirect method using HMDS Hexamethyldisilolane diffusion overnight. You don't need TISAB has will not give you the bound fluoride.
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