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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 6
BKCSDE 31(6)
June 20, 2010 

Development of a Fluoride-Selective Electrode based on Scandium(III) Octaethylporphyrin in a Plasticized Polymeric Membrane
Youngjea Kang, Christopher Lutz, Sung A Hong, Dayeon Sung, Jae Seon Lee, Jae Ho Shin, Hakhyun Nam, Geun Sig Cha*, Mark E Meyerhoff*
Fluoride sensor, Hydrofluoric acid gas sensor, Ion-selective electrode, Scandium porphyrin
A scandium(III) porphyrin-based fluoride-selective potentiometric sensor and its application in the analysis of hydrofluoric acid is described. Scandium(III) octaethylporphyrin, an ionophore recently developed for the optical fluoride sensor, was employed as a host molecule for the selective binding with fluoride in the plasticized PVC membrane. Nernstian response for F- between 10-4.6 to 10-1 M was observed at a glycine-phosphate buffer (pH 3.0). The selectivity pattern was observed as F-, salicylate >> SCN- > Cl-, Br-, NO3-, ClO4-, which is consistent with the binding constant data measured in the plasticized PVC membrane based on a sandwich membrane method. This highly selective and reversible fluoride- sensitive electrode was employed for the analysis of hydrofluoric acid (HF). A disposable differential-type HF sensor was fabricated on the screen-printed electrode and demonstrated its ability to detect the neutral HF in the acidic solution.
1601 - 1608
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