Table 1 Selectivity coefficient values of membrane based on 25,27-di-(5-thio-octyloxy)calix[4]arene-crown-6 for ammonium determination
Interfering ion (B) | Selectivity coefficient, \( {K}_{\mathrm{NH}4,\ B}^{\mathrm{Con}} \) | Logarithm of selectivity coefficient, log \( {K}_{\mathrm{NH}4,\ B}^{\mathrm{Con}} \) |
---|---|---|
Na+ | 3.8 × 10−1 | −0.923 |
K+ | 2.8 × 10−1 | -1.095 |
Mg2+ | 9.8 × 10−2 | -2.243 |
Ca2+ | 1.2 × 10−1 | -2.249 |
Al3+ | 7.3 × 10−2 | -2.458 |