TOTAL SOIL FLUORIDE DETERMINATION BY A SINGLE DISTILLATION SELECTIVE ION ELECTRODE PROCEDURE

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Abstract
A simple, precise method is presented for determining total soil fluoride. The soil sample is decomposed by a standard steam distillation in the presence of H2SO4. An aliquot of the resulting distillate is diluted 1:1 with a total ionic strength adjustment buffer (TISAB), and the fluoride determination is made by selective ion electrode (pF) procedure. This method, when compared with a double distillation-pF technique on 15 Ohio [USA] soils, yielded slightly but significantly higher results. The H2SO4 distillation-pF procedure is relatively quick, precise and reproducible, and eliminates the hazard associated with the HClO4 distillation step used in most other techniques.

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