Mercury(II) selective membrane electrode based on 1,3-bis(2-methoxybenzene)triazene

✍ Scribed by Mohammad Kazem Rofouei; Moslem Mohammadi; Mohammad Bagher Gholivand

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 378 KB
• Volume: 29
• Category: Article
• ISSN: 0928-4931
• DOI: 10.1016/j.msec.2009.04.017

✦ Synopsis

A plasticized poly (vinyl chloride) membrane electrode based on 1,3-bis(2-methoxybenzene)triazene (MBT) for highly selective determination of mercury(II) has been developed. The electrode showed a good Nernstian response (30.2 ± 0.3 mV decade -1 ) over a wide concentration range (1.0× 10 -7 -1.0 × 10 -2 mol L -1 ). The limit of detection was 5.0 × 10 -8 mol L -1 . The electrode has a response time about 15 s and can be used for at least 1 month without observing any deviation from Nernstain response. The proposed electrode revealed an excellent selectivity toward mercury(II) ion over a wide variety of alkali, alkaline earth, transition, and heavy metal ions and could be used in the pH range 2.6-4.2. The electrode was used in the determination of Hg 2+ in aqueous samples and as an indicator electrode in potentiometric titration of Hg(II) ions.