Cathodic Stripping Voltammetric Determination of Selenium(IV) at a Nafion Coated Mercury Film Electrode Modified with 3,3′-Diaminobenzidine

✍ Scribed by Hao-Yun Yang; I-Wen Sun

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 85 KB
• Volume: 12
• Category: Article
• ISSN: 1040-0397
• DOI: 10.1002/1521-4109(200012)12:18<1476::aid-elan1476>3.0.co;2-d

✦ Synopsis

Determination of selenium(IV) was investigated on a 3,3 H -diaminobenzidine=Na®on=mercury ®lm modi®ed glassy carbon electrode (DNMFE). The 3,3 H -diaminobenzidine=Na®on coating solution was irradiated by a tungsten light bulb to oxidize the 3,3 H -diaminobenzidine. This coating solution was then spin-coated onto a glassy carbon electrode. Subsequently, mercury was electrodeposited onto the electrode surface. Selenium(IV) was preconcentrated onto the DNMFE from the sample solution saturated with ethylenediaminetetraacetate (EDTA) at an accumulation potential of 7 0.35 V, and determined by cathodic square-wave stripping voltammetry (SWSV). Various parameters affecting the selenium determination were examined. With 5 min accumulation, the analytical signal was linear from 1 to 300 mgL 71 , and the detection limit was 0.48 mgL 71 . The proposed procedure showed a good accumulation ef®ciency for selenium and good resistance to interferences from metal ions as well as surface-active compounds.