Novel PVC-membrane potentiometric sensors based on a recently synthesized sulfur-containing macrocyclic diamide for Cd2 ion. Application to flow-injection potentiometry

作者：Shamsipur Mojtaba^*; Dezaki Abbas Shirmardi; Akhond Morteza; Sharghi Hashem; Paziraee Zahra; Alizadeh Kamal

来源：Journal of Hazardous Materials, 2009, 172(2-3): 566-573.

DOI：10.1016/j.jhazmat.2009.07.003

• Cadmium ion-selective electrodes
• Sulfur-containing macrocyclic diamide
• PVC-membrane
• Coated graphite and coated wire
• Potentiometry
• Flow-injection

A new sulfur-containing macrocyclic diamide, 1,15-diaza-3,4,12,13-dibenzo-5,11-dithia-8-oxa-1,15-(2,6-pyrido)cyclooctadecan-2,14-dione, L, was synthesized, characterized and used as an active component for fabrication of PVC-based polymeric membrane (PME), coated graphite (CGE) and coated silver wire electrodes (CWE) for sensing Cd2 ion. The electrodes exhibited linear Nernstian responses to Cd2 ion in the concentration range of 3.3 x 10(-6) to 3.3 x 10(-1) M (for PME, LOD = 1.2 x 10(-6) M), 2.0 x 10(-7) to 3.3 x 10(-1) M (for CWE, LOD = 1.3 x 10(-7) M) and 1.6 x 10(-8) to 1.3 x 10(-1) M (for CGE, LOD = 1.0 x 10(-8) M). The CGE was used as a proper detection system in flow-injection potentiometry (FIP) with a linear Nernstian range of 3.2 x 10(-8) to 1.4 x 10(-1) M (LOD= 1.3 x 10(-8) M). The optimum pH range was 3.5-7.6. The electrodes revealed fairly good discriminating ability towards Cd2 in comparison with a large number of alkali, alkaline earth, transition and heavy metal ions. The electrodes found to be chemically inert, showing a fast response time of <5 s, and could be used practically over a period of about 2-3 months. The practical utility of the proposed system has also been reported.

• 出版日期2009-12-30