Table 1.

Membrane compositions and potentiometric response characteristics of fluoride-selective electrodes using the new Al(III) and Zr(IV) porphyrin complexes as ionophores. Membrane composition: ionophore (1 wt%), PVC/plasticizer (1:2) and lipophilic ionic additives (B = KTFPB, T = TDMACl)

ID	Ionophore	Plasticizer	Additives amount / type [mol%]	Slope [mV decade−1]	Detection limit [M]
1	Al[t-BTPP]	o-NPOE	10 / B	−59.2 ± 0.3	4·10−5
2			25 / B	−57.1 ± 0.2	1·10−4
3			50 / B	−55.2 ± 0.3	3·10−4
4			10 / T	−57.7 ± 0.2	2·10−4
5		DOS	10 / B	−59.0 ± 0.4	9·10−5
6			25 / B	−57.7 ± 0.2	2·10−4
7			50 / B	−55,6 ± 0.3	4·10−4
8			10 / T	−59.1 ± 0.2	1·10−4
9	Zr[t-BTPP]	o-NPOE	10 / B	−58.1 ± 0.2	8·10−5
10			25 / B	−57.8 ± 0.3	1·10−4
11			50 / B	−57.5 ± 0.3	3·10−4
12			10 / T	−60.0 ± 0.3	6·10−5
13		DOS	10 / T	−60.2 ± 0.2	2·10−4
14	Al[dClTPP]	o-NPOE	10 / B	−59.7 ± 0.3	1·10−4
15			25 / B	−56.2 ± 0.1	2·10−4
16			50 / B	−51.3 ± 0.3	3·10−4
17			10 / T	−58.2 ± 0.3	2·10−4
18		DOS	10 / B	−54,9 ± 0.4	2·10−4
19			25 / B	−56.5 ± 0.3	3·10−4
20			50 / B	−51.2 ± 0.4	6·10−4
21			10 / T	−57.9 ± 0.3	2·10−4
22	Zr[dClTPP]	o-NPOE	10 / B	−60.1 ± 0.4	3·10−4
23			25 / B	−55.8 ± 0.2	1·10−3
24			50 / B	−52.2 ± 0.3	4·10−3
25			10 / B	−57.2 ± 0.4	5·10−4
26		DOS	10 / B	−56.8 ± 0.3	5·10−4
27			25 / B	−55.4 ± 0.2	6·10−4
28			50 / B	−52.6 ± 0.3	2·10−3
29			10 / T	−58.6 ± 0.3	1·10−3