Potentiometric sensor for the nanoscale monitoring of Ni2+ ion in environmental samples by the fabrication of coated pyrolytic graphite electrode based on a novel C–C-coupled compound. Issue 12 (25th September 2016)

• Record Type: Journal Article
• Authors: Sahani, Manoj K.; Singhal, Divya; Singh, Ashok K.; Jain, Ajay K.; Singh, Udai P.; Narang, Shikha
• Is Part Of: International journal of environmental analytical chemistry. Volume 96:Issue 12(2016)
• Page Start: 1170
• Page End: 1187
• Publication Date: 2016-09-25
• Subjects: C–C coupling -- Single-crystal X-ray diffraction -- Coated pyrolytic graphite electrode -- Ni2+ ion-selective electrode -- Potentiometry; Ecology -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental chemistry -- Periodicals; Pollution -- Periodicals; 577.14
• DOI: 10.1080/03067319.2016.1244671
• Languages: English
• ISSNs: 0306-7319

Abstract

ABSTRACT: Novel ligand 5, 5ʹ-((3-nitrophenyl)methylene)bis(2, 6-diaminopyrimidin-4(3H)-one) (L) was synthesised and characterised. Preliminary studies on L have showed that it has more affinity towards the Ni 2+ ion. Thus, the L was used as the electroactive material in the fabrication of poly(vinyl chloride) (PVC)-based membrane sensors such as coated graphite electrode (CGE) and coated pyrolytic graphite electrode (CPGE). Several polymeric membranes were fabricated by incorporating L as ionophore, NaTPB as anion excluders and BA, 1-CN, DBP, DOP and o -NPOE as solvent mediators and their effect on potentiometric response studied. Comparative electroanalytical studies performed on the CGE and CPGE depict that the CPGE with optimised membrane composition of L:PVC: o -NPOE:NaTPB in the ratio of 7:33:58:2 (w/w, mg) exhibited the best response in terms of wide working concentration range from 2.0 × 10 − 8 to 1.0 × 10 − 1 mol L −1, (3.64 µg L −1 –18.2 g L −1 ) lower detection limit of 8.1 × 10 – 9 mol L −1 (1.47 µg L −1 ) with Nernstian compliance of 29.4 ± 0.2 mV decade −1 of activity of Ni 2+ ion in the pH range of 3.5–9.0. The sensor can work satisfactorily in water–acetonitrile and water–methanol mixtures. It can tolerate 30% acetonitrile and 20% methanol content in the mixtures. The sensor showed fast response time of 8 s and could be used successfully for a period of 4 months. The sensor reflects its utility in the quantification of Ni 2+ ion in real samples and has been successfully employed as an indicator electrode in the potentiometric titration of Ni 2+ ion with EDTA.