Abstract − Analytical Sciences, 26(5), 603 (2010).
Determination of Total Fluoride in Boron-containing Solutions
Siqingaowa BORJIGIN,* Toshiaki YOSHIOKA,* and Tadaaki MIZOGUCHI**
*Graduate School of Environmental Studies, Tohoku University, 6-6-7 Aramaki Aza Aoba, Aoba, Sendai 980-8579, Japan
**Environment Conservation Research Institute, Tohoku University, 6-6-11 Aramaki Aza Aoba, Aoba, Sendai 980-8579, Japan
**Environment Conservation Research Institute, Tohoku University, 6-6-11 Aramaki Aza Aoba, Aoba, Sendai 980-8579, Japan
We describe a pretreatment method before determining the total fluoride in solutions containing tetrafluoroborate ion (BF4−) with ion-selective electrodes (ISEs). BF4− was quantitatively converted to free fluoride by reacting with aluminum ions. The total fluoride concentration was then determined by ISE analysis without preliminary steam distillation using a tartrate- and tris(hydroxymethyl)methylamine (TRIS)-based total ionic strength adjustment buffer (TISAB). We investigated the effects of various factors on the decomposition of BF4− with aluminum ions, including the concentration of aluminum, pH, reaction temperature, and reaction time. The quantitative decomposition of BF4− was complete after 2 h at 50°C or 1 h at 70°C.
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