Mercury(II) ion-selective polymeric membrane sensor based on a recently synthesized Schiff base.
A new polyvinyl chloride (PVC) membrane electrode that is highly selective to Hg(II) ions was prepared by using bis[5-((4-nitrophenyl)azo salicylaldehyde)] (BNAS) as a suitable neutral carrier. The sensor exhibits a Nernstian response for mercury ions over a wide concentration range (5.0x10(-2)-7.0x10(-7) M) with a slope of 30+/-1 mV per decade. It has a response time of <10 s and can be used for at least 3 months without any measurable divergence in potential. The electrode can be used in the pH range from 1.0 to 3.5. The proposed sensor shows fairly good discriminating ability towards Hg(2+) ion in comparison with some hard and soft metals. The electrode was used in the direct determination of Hg(2+) in aqueous solution and as an indicator electrode in potentiometric titration of mercury ions.
Mashhadizadeh
Mohammad Hossein
MH
Department of Chemistry, Shahid Bahonar University of Kerman, P.O. Box 133, Kerman 76169, Iran.
Sheikhshoaie
Iran
I