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. Author manuscript; available in PMC: 2008 Sep 22.
Published in final edited form as: Anal Chem. 2005 Oct 15;77(20):6719–6728. doi: 10.1021/ac050987t

Fig. 3.

Fig. 3

[A] Absorption spectra of Film 4 measured in 50 mM glycine-phosphate buffer, pH 3.00, and at varying fluoride ion concentrations: 0.2, 2, and 22 μM, and 0.22, 0.7, 2.1, and 5.5 mM. The peak absorbance at 529 nm decreased monotonically with increasing fluoride concentration. [B] Typical response time of Al[OEP]/ETH-7075 sensing Film-4, measured in 50 mM glycine-phosphate buffer, pH 3.00, at different fluoride concentrations. Dashed line represents the recovery time when changing the sample from 19.8 mM to fluoride-free buffer solution.