Multi-walled carbon nanotubes-ionic liquid-carbon paste electrode as a super selectivity sensor: Application to potentiometric monitoring of mercury ion(II)

作者：Khani Hadi^*; Rofouei Mohammad Kazem; Arab Pezhman; Gupta Vinod Kumar; Vafaei Zahra

来源：Journal of Hazardous Materials, 2010, 183(1-3): 402-409.

DOI：10.1016/j.jhazmat.2010.07.039

• Mercury determination
• Carbon paste electrode
• Carbon nanotubes
• Ionic liquid

In this article a super selectivity potentiometric methodology, using an ion-selective electrode, for determination of mercury ion(II) in aqueous solution was investigated. For modification of the electrode a room temperature ionic liquid, 1-n-butyl-3-methylimidazolium tetrafluoroborate (BMIM.BF(4)), was applied as a super conductive binder, and Multi-walled carbon nanotubes (MWCNTs) was used in the composition of the carbon paste to improve conductivity and transduction of chemical signal to electrical signal. Moreover, incorporation of 1-(2-ethoxyphenyl)-3-(3-nitrophenyl)triazene (ENTZ) as an ionophore to this composition caused to significantly enhanced selectivity toward Hg(II) ions over a wide concentration range of 1.0 x 10(-4) to 5.0 x 10(-9) M with a lower detection limit of 2.5 x 10(-9) M (0.5 ppb) and a Nernstian slope of 29.3 +/-(0.2) mV decade(-1) of Hg(II) activity. The electrode has a short response time (similar to 5s) and can be used for at least 55 days without any considerable divergence in potentials, and the working pH range was 2.0-4.3. Finally, the proposed electrode was successfully used as an indicator for potentiometric determination of Hg(II) in dental amalgam and water samples.

• 出版日期2010-11-15
• 单位中国石油大学（北京）