A Tosflex/mercury film electrode (TMFE) was prepared by spin-coating a solution of the perfluorinated anion exchange polymer Tosflex onto a glassy carbon electrode surface followed by electrodeposition of a mercury film on this electrode. This electrode was used for the determination of trace thallium(III) which was preconcentrated onto the TMFE as the [TICl4)- anion in a chloride medium by the anion-exchange feature of Tostlex and then determined by anodic square-wave stripping voltammetry (SWSV). Various parameters influencing the determination of thallium(III) were examined in detail. With 1 min accumulation, the analytical signal versus concentration dependence was linear from 0 to 80 ppb, and the detection limit was 0. 1 ppb. The modified electrode showed good resistance to interferences from surface-active compounds and common ions. For repetitive use, the TMFE surface could be easily regenerated by setting the electrode potential at -0.4 V for 30 s.
|Number of pages||5|
|Publication status||Published - 1998 Jan 1|
All Science Journal Classification (ASJC) codes
- Analytical Chemistry