Gold Plate Electrodes Functionalized by Multiwall Carbon Nanotube Film for Potentiometric Thallium(I) Detection.

ABSTRACT: Solid-contact potentiometric ion-selective electrodes (SC-ISEs) for thallium determination have been designed using multiwall carbon nanotubes (MWCNTs) as the ion-to-electron transducer. Dispersed MWCNTs were drop-casted over a gold plate electrode. Two different crown ethers were used in the sensing membrane for the recognition of thallium (I). Sensorsbased on dibenzo-18-crown-6 (DB18C6) as a neutral carrier and NaTPB as an anionic additive exhibited a near Nernstian response of 57.3 mV/decade towards Tl⁺ ions over the activity range 4.5 × 10^-6-7.0 × 10^-4 M, with a limit of detection of 3.2 × 10^-7 M. The time required to achieve 95% of the steadyequilibrium potential was <10 s. The complex formation constant (log β_ML) between d

SUBMITTER: Hassan SSM 

PROVIDER: S-EPMC6723907 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature