Investigation of the response time of a modified carbon nanotube sensor based on N-quinoline-2-carboxamido-8-aminoquinoline

In this article a super selectivity potentiometric methodology, using an ion-selective electrode, for determination of Hulmium ion (III) in aqueous solution was investigated. a Multi-walled carbon nanotubes (MWCNTs) was used in the composition of the carbon paste to improve conductivity and transduction of chemical signal to electrical signal. Moreover, incorporation of N-quinoline-2-carboxamido-8-aminoquinoline (QCA) as an ionophore to this composition caused to significantly enhanced selectivity toward Ho3+ ions. The electrode has a short response time ( 10 s) and can be used for at least two weeks without any considerable divergence in potentials.