Tm3+-PVC Membrane Electrochemical Sensor Based on N-[(E)-1-(2-thienyl)methylidene]-N-{4-[(4-{[(Z)-1-(2-thienyl)methylidene]amino}phenyl)sulfonyl]phenyl}amine

摘要

The N - [ ( E ) 1 - (2 thienyl ) methylidene ] N - { 4 - [ ( 4 - { [ ( Z ) 1 - ( 2 thienyl )methylidene ] amino } phenyl )sulfonyl ] phenyl } amine (TAS) was used as a suitable ionophore forfabrication of a new thulium(III) ion selective potentiometric sensor. The sensor displays a Nernstian -1 response (19.4.3 mV/decade) in the concentration range of 1.010 to 1.010 mol L with the -1 detection limit of 6.910 mol L at a pH range of 3.1.9. The electrode shows a fast response time(~5 s). This sensor shows very good selectivity and sensitivity towards thulium ion over a wide varietyof cations, including alkali, alkaline earth, transition and heavy metal ions. The sensor revealed a greatenhancement in selectivity coefficients for thulium ions, in comparison to the previously reportedthulium sensors. For testing applicability of the sensor, it was used as an indicator electrode in the3+ 3+ potentiometric titration of Tm ions with EDTA and in the titration of Tm ion solutions in certifiedreference materials.