“…Meanwhile, potentiometric methods based on the use of ion-selective electrodes appeared as an alternative because of their inherent advantages over those methods, such as portability and real-time analysis [ 7 , 8 , 9 , 10 , 11 ]. The use of ion PVC sensors, where the plasticizer was dopped with sparingly soluble atropine salts, such as atropine-reineckate [ 8 ], atropine-phosphotungstate [ 10 ], atropine-tetrakis(4-chlorophenyl)-borate [ 9 ], or simply potassium tetrakis-[3,5-bis-(trifloromethyl)-phenyl] borate [ 8 , 9 , 10 ], enabled simplified potentiometric determination based on the exchange equilibrium with the sample solution, though with low selectivity trade-off [ 12 ]. In turn, the use of neutral ionophores, such as β-cyclodextrin [ 10 ], phosphorated calix[6]arene derivatives [ 13 ] or valinomycin [ 14 ], looks to have better sensor characteristics concerning the selectivity as well as a larger linear response.…”