. 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

Table 2.

Selectivity Coefficients of Al[OEP]/ETH-7075 Based Fluoride Optical Sensing Films, Measured in 100 mM β-Alanine-Phosphate Buffer, 1 mM CDTA, pH 3.60, in Comparison with the Potentiometric Selectivity Coefficients of Zr(IV)[OEP], and Ga(III)[OEP] Membrane Electrodes.

		$log K_{Fluoride, Anion}^{opt}$		$log K_{Fluoride, Anion}^{pot}$

Anion	logK_{Fluoride, Anion} (Required)	Al[OEP], Film-6	Al[OEP], Film-7	Zr(IV)[OEP] ISE^a	Ga(III)[OEP] ISE^b
F⁻	0.0	0.0	0.0	0.0	0.0
SO₄²⁻	−4.7	≤−7.1	-	-	-
Cl⁻	−4.8	≤−7.1	-	−5.1 (−4.3)	−2.9
NO₃⁻	−3.2	−6.4	-	−2.4 (−1.8)	−2.3
NO₂⁻	−2.3	−6.4	-	-	−0.77
Br⁻	-	≤−7.1	-	−3.4 (−2.7)	-
SCN⁻	-	−4.2	−3.0	−0.5 (0.3)	0.53
ClO₄⁻	-	−4.5	−3.6	0.4 (0.9)	2.0

Data from (ref.²²) for Zr(IV)[OEP] as a charged carrier, and data in parenthesis are from (ref.²³) for Zr(IV)[OEP] as a neutral carrier

From (ref.²⁰)