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Table 1 Selectivity coefficient values of membrane based on 25,27-di-(5-thio-octyloxy)calix[4]arene-crown-6 for ammonium determination

From: Development of Conductometric Sensor Based on 25,27-Di-(5-thio-octyloxy)calix[4]arene-crown-6 for Determination of Ammonium

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