. 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 3.

Determination of Fluoride in Drinking Water Samples Using Al[OEP]/ETH-7075 Based Fluoride Optical Sensitive Membrane, Film-6, and LaF₃ ISE in 100 mM β-Alanine buffer, pH 3.60, 1 mM CDTA.

	Al[OEP]/ETH-7075		LaF₃-ISE

Sample	ppm	c.v., %^a	ppm	c.v., %^a
1	0.73	2.5	0.70	0.42
2	0.51	2.1	0.54	0.42
3	0.46	3.2	0.47	0.64
4	0.36	2.9	0.39	0.75
5	0.12	3.1	0.16	0.75

(c.v. is the coefficient of variance, n = 3)