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The paper is focused on lipophilic acyclic thioethers as neutral ionophores for heavy-metals cations. Membranes based on plasticized PVC containing these carriers exhibited high selectivity toward silver cations over transition metal ions (log KAgM < -4.5) except mercury ions. Membrane containing the ionophore II (with l-naphtyl pendant group) was used to design silver-selective ISE which shows linear response in the range 3 - 6 pAg with a slope of 51.5 mV/pAg. The addition of the pH chromoionophore to the membrane composition allowed to obtain a silver-sensitive optrode membrane, responding in the concentration range 0.01 - 1 mM Ag+.
Wojciech Wroblewski,Artur Dybko,Ewa Rozniecka, andZbigniew Brzozka
"Ag+-sensitive membranes for electrochemical and optical sensors", Proc. SPIE 3730, Optoelectronic and Electronic Sensors III, (30 April 1999); https://doi.org/10.1117/12.346841
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Wojciech Wroblewski, Artur Dybko, Ewa Rozniecka, Zbigniew Brzozka, "Ag+-sensitive membranes for electrochemical and optical sensors," Proc. SPIE 3730, Optoelectronic and Electronic Sensors III, (30 April 1999); https://doi.org/10.1117/12.346841