Fig. 1

The potentiometric response of ISEs containing various ionophores in 1.0 mM TUL solution after subtracting each ISE's reading to 1.0 mM (Pe)4N+ solution
The potentiometric response of ISEs containing various ionophores in 1.0 mM TUL solution after subtracting each ISE's reading to 1.0 mM (Pe)4N+ solution