Potentiometric Stripping Analysis of Traces of Thallium(III) at a Poly(4-Vinylpyridine)/Mercury Film Electrode

✍ Scribed by Jyh-Myng Zen; Wei-Ming Wang; Annamalai Senthil Kumar

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 89 KB
• Volume: 13
• Category: Article
• ISSN: 1040-0397
• DOI: 10.1002/1521-4109(200103)13:4<321::aid-elan321>3.0.co;2-u

✦ Synopsis

The application of potentiometric stripping analysis (PSA) to the trace determination of thallium(III) at a poly(4-vinylpyridine)amercury ®lm electrode (PVPaMFE) is demonstrated. Thallium(III) is preconcentrated as the anionic form, [TlCl 4 ] À , by the ion-exchange effect into the PVPaMFE. The high solubility of thallium in mercury subsequently helps to increase the accumulation effect. The variable factors in¯uencing the PSA response are thoroughly explored and optimized. The PVPaMFE shows good resistance to interferences from surfaceactive compounds and common ions with an excellent sensitivity by PSA over square-wave voltammetry (SWV). With 1 min of accumulation time, the calibration plot was found to be linear up to 100 ppb with a detection limit of 0.064 ppb (SaN 3). The analytical utility was demonstrated by application to various water samples.