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Four macrocyclic polyether derivatives of 1, 10-phenanthroline were synthesized and used as neutral carriers for preparing poly(vinyl chloride) (PVC) membrane electrodes to sense primary amine species. The potentiometric response characteristics of the prepared electrodes were investigated. An electrode sensitive to benzylamine as a model analyte showed a linear response range of 1.0×10-5 to 0.1mol dm-3 with a detection limit 2.0×10-6mol dm-3 and a slope of 55.6mV/decade. The linear potentiometric response of the mexiletine-sensitive electrode was 6.0×10-6 to 0.1mol dm-3, and the detection limit was 8.0×10-7mol dm-3 with a slope of 58.0mV/decade. The transfer behavior of the amine and ammonium species through an organic phase was investigated by means of a bulk liquid-membrane transport experiment. The relationship between the potentiometric response characteristics of the prepared electrodes and the transport characteristics of the membranes has been studied. The mass-transfer rates of the test species facilitated by the macrocyclic polyether derivatives of 1, 10-phenanthroline were determined, and the following sequence was found: benzylamine>ethylamine>tetraethylammonium>triethylamine>diethylamine. This was exactly the potentiometric selectivity sequence of the membrane electrodes prepared by using these carriers.

analytical sciences

Relationship between the Potentiometric Response Characteristics of Primary Amine Electrodes Based on Synthetic Polyether Derivatives of 1, 10-Phenanthroline and Membrane Transport Characteristics