title: Nano-level monitoring of Er(III) by fabrication of coated graphite electrode based on newly synthesized Schiff base as neutral carrier.
abstract: Plasticized membranes using N-(-3-((thiazol-2-ylimino)methyl)benzylidene)thiazol-2-amine (S1) and 5-((-3-((5-mercapto-1,3,4-thiadiazol-2-ylimino)methyl)benzylidene)amino)-1,3,4-thiadiazole-2-thiol (S2) have been prepared and explored as Er (III) selective electrodes. Effect of various plasticizers viz. dibutylphthalate, tri-n-butylphosphate, dioctylphthalate, acetophenone, 1-chloronapthalene, o-nitrophenyloctylether, and anion excluders viz. sodium tetraphenylborate and potassium tetrakis-p-(chlorophenyl)borate was studied in detail and improved performance was observed. Optimum performance was observed for the membrane electrode having a composition of S2: PVC: o-NPOE: KTpClPB in the ratio of 4: 38: 55: 3 (w/w, mg). The performance of the PME based on S2 was compared with CGE. The electrodes exhibit Nernstian slope for Er (III) ion with detection limit 5.4 × 10(-8)mol L(-1) for PME and 6.1 × 10(-9)mol L(-1) for CGE. The response time for PME and CGE was found to be 12s and 9s respectively. The practical utility of the CGE has been demonstrated by its usage as an indicator electrode in potentiometric titration of EDTA with Er (III) solution and determination of fluoride ions in mouthwash solution. The proposed electrode was also applied to the determination of added Er(3+) ion in water and binary mixtures. It is found that the electrode could be able to recover the Er(3+) ion in 96.2-99.5%.
authors.affiliation: Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247667, India.
authors.forename: Koteswara Rao
authors.initials: KR
authors.lastname: Bandi
authors.affiliation: Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247667, India.
authors.forename: Anjali
authors.initials: A
authors.lastname: Upadhyay
authors.affiliation: Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247667, India. Electronic address: akscyfcy@iitr.ernet.in.
authors.forename: Ashok K
authors.initials: AK
authors.lastname: Singh
authors.affiliation: Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247667, India.
authors.forename: A K
authors.initials: AK
authors.lastname: Jain
mesh_terms: D004492:Edetic Acid / Q000737:chemistry; D055664:Electrochemical Techniques; D004871:Erbium / Q000032:analysis*; D005459:Fluorides / Q000032:analysis; D006108:Graphite / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D017736:Ion-Selective Electrodes; D007477:Ions / Q000737:chemistry; D057230:Limit of Detection; D008567:Membranes, Artificial; D009067:Mouthwashes / Q000737:chemistry; D010968:Plasticizers / Q000737:chemistry; D011199:Potentiometry; D012545:Schiff Bases / Q000138:chemical synthesis / Q000737:chemistry*; D014100:Toothpastes / Q000737:chemistry; D014867:Water / Q000737:chemistry
chemical_list: D007477:Ions; D008567:Membranes, Artificial; D009067:Mouthwashes; D010968:Plasticizers; D012545:Schiff Bases; D014100:Toothpastes; D014867:Water; D006108:Graphite; D004871:Erbium; D004492:Edetic Acid; D005459:Fluorides
keywords: Coated graphite electrode; Ion selective electrode; Polymeric membrane electrode; Potentiometric electrodes