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. Author manuscript; available in PMC: 2019 Dec 10.
Published in final edited form as: Sens Actuators B Chem. 2004 Jul 1;104(1):103–110. doi: 10.1016/j.snb.2004.04.119

Fig. 3.

Fig. 3.

Absorption spectra of BAQBA with increasing fluoride concentration (top) and the respective wavelength ratiometric plot based on the A342/A388 absorption bands (bottom). Insert – enlarged 0–50 mM fluoride region.