Table 3.
Potentiometric selectivity coefficients, log , and response slopes (in parentheses; concentration ranges: 10−3–10−5M for Ag+ and Et4N+, 10−2 to 10−4M for all other ions) obtained with the separate solution method for PVC membranes based on the ionophores VII–X (cf. Fig. 2)
| Ion J | VII | VIII | IX (o-NPOE) | IX (DOS) | X (o-NPOE) | X (DOS) |
|---|---|---|---|---|---|---|
| Ag+ | 0 (59.1) | 0 (57.6) | 0 (61.2) | 0 (61.6) | 0 (60.5) | 0 (61.5) |
| H+ | −8.92 ± 0.14 (48.1) | −10.88 ± 1.52 (52.1) | −10.17 ± 0.12 (47.0) | −7.37 ± 0.01 (57.7) | −6.74 ± 0.01 (54.5) | −6.61 ± 0.04 (58.2) |
| Na+ | −9.04 ± 0.13 (46.3) | −11.46 ± 0.65 (57.7) | −10.32 ± 0.13 (41.5) | −7.90 ± 0.02 (59.0) | < −9.62 (−0.2) | −8.00 ± 0.02 (46.2) |
| K+ | −7.12 ± 0.10 (54.3) | −7.69 ± 0.12 (53.4) | −8.44 ± 0.21 (56.9) | −7.50 ± 0.02 (57.9) | −8.16 ± 0.05 (33.5) | −7.51 ± 0.02 (52.3) |
| Mg2+ | −10.12 ± 0.17 (24.1) | −10.89 ± 0.15 (27.7) | −11.44 ± 0.23 (27.5) | −11.01 ± 0.04 (12.2) | < −10.54 (−9.9) | < −10.74 (2.3) |
| Ca2+ | −10.17 ± 0.14 (28.2) | −12.78 ± 0.12 (27.8) | −11.29 ± 0.12 (27.6) | −10.71 ± 0.04 (18.2) | < −10.46 (3.6) | < −10.43 (7.9) |
| Cu2+ | −9.01 ± 0.21 (24.4) | −8.19 ± 0.24 (16.6) | −11.08 ± 0.22 (20.5) | −10.13 ± 0.04 (30.0)5 | −9.14 ± 0.04 (21.8) | −9.19 ± 0.02 (30.4) |
| Hg2+ | −2.67 ± 0.15 (60.9)b | not measureda | −3.54 ± 0.12 (35.6) | −2.58 ± 0.04 (35.0) | −4.68 ± 0.02 (43.5)b | −3.90 ± 0.02 (34.7) |
| Pb2+ | −8.68 ± 0.19 (32.3) | −9.20 ± 0.13 (33.2) | −10.41 ± 0.22 (35.0) | – | −8.56 ± 0.03 (46.5) | – |
| Et4N+ | −3.04 ± 0.08 (68.4) | −4.77 ± 0.13 (60.6)a | −3.47 ± 0.02 (65.4) | −4.35 ± 0.01 (61.3) | −3.65 ± 0.02 (63.3) | −4.63 ± 0.01 (59.4) |
a
Strongly drifting signals.
b
For the concentration range of 10−2–10−3M.