A fast response cadmium-selective polymeric membrane electrode based on N,N'-(4-methyl-1,2-phenylene)diquinoline-2-carboxamide as a new neutral carrier.
A new polyvinylchloride membrane sensor for Cd(2+) ions based on N,N'-(4-methyl-1,2-phenylene)diquinoline-2-carboxamide (Mebqb) as a new and excellent neutral ionophore has been prepared. The sensor shows a Nernestian response for cadmium ions over a wide concentration range (1.0 x 10(-6) to 1.0 x 10(-1) M) with the determination coefficient of 0.9964 and slope of 29.9 +/- 0.5 mV decade(-1). The limit of detection is 8 x 10(-7) M. It has a fast response time of 3-8s and can be used for at least 8 weeks without any divergence in potential. The electrode can be used in the pH range from 4.0 to 9.0. The proposed sensor shows a very good discriminating ability towards Cd(2+) ion in comparison to some alkali, alkaline earth, transition and heavy metal ions. It was successfully applied for the direct determination of Cd(2+) in standard and real sample solutions.
Rezaei
B
B
Department of Chemistry, Isfahan University of Technology, Isfahan, Islamic Republic of Iran. rezaei@cc.iut.ac.ir
Meghdadi
S
S
Zarandi
R Fazel
RF
D002104:Cadmium / Q000032:analysis*; D004566:Electrodes; D004784:Environmental Monitoring; D006863:Hydrogen-Ion Concentration; D007476:Ionophores / Q000737:chemistry*; D011143:Polyvinyl Chloride / Q000737:chemistry*; D011804:Quinolines / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*
D007476:Ionophores; C529710:N,N'-(4-methyl-1,2-phenylene)diquinoline-2-carboxamide; D011804:Quinolines; D014874:Water Pollutants, Chemical; D002104:Cadmium; D011143:Polyvinyl Chloride