title: A comparative study on fabrication of Mn2+ selective polymeric membrane electrode and coated graphite electrode.
abstract: Poly(vinyl chloride)-based membranes of two ligands 2,4-bis(2-acetoxybenzylamino)-6-phenyl-1,3,5-triazine (L1) and N2,N4-di(cyanoethyl)-2,4-bis(2-acetoxybenzylamino)-6-phenyl-1,3,5-triazine (L2) were fabricated and explored as Mn(2+) ion selective electrodes. The performance of the polymeric membranes electrodes of ionophores with different plasticizers (dibutylphthalate, benzoic acid, o-nitrophenyloctyl ether, 1-chloronapthalene and tri-n-butylphosphate) and anion excluders (sodium tetraphenylborate and potassium tetrakis p-(chloro phenyl)borate) was looked in to and the better results were obtained with the membrane having composition L2: NaTPB: DBP: PVC as 6: 3: 56: 35 (w/w; mg). The coated graphite electrode (CGE) with same composition was also fabricated and investigated as Mn(2+) selective electrode. It was found that CGE showed better response characteristics than PME. The potentiometric response of CGE was independent of pH in the range 3.0-9.0 exhibiting the Nernstian slope 29.5 ± 0.3 mVdecade(-1) of activity and working concentration range 4.1 × 10(-7)-1.0 × 10(-1)mol L(-1) with a limit of detection 6.7 × 10(-8)mol L(-1). The electrode showed a fast response time of 12s with a shelf life of 105 days. The proposed CGE could be successfully used for the determination of Mn(2+) ions in different water, soil, vegetables and medicinal plants also used as an indicator electrode in potentiometric titration with EDTA.
authors.affiliation: Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee-247 667, India. Electronic address: akscyfcy@iitr.ernet.in.
authors.forename: Ashok Kumar
authors.initials: AK
authors.lastname: Singh
authors.affiliation: Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee-247 667, India.
authors.forename: Koteswara Rao
authors.initials: KR
authors.lastname: Bandi
authors.affiliation: Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee-247 667, India.
authors.forename: Anjali
authors.initials: A
authors.lastname: Upadhyay
authors.affiliation: Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee-247 667, India.
authors.forename: A K
authors.initials: AK
authors.lastname: Jain
mesh_terms: D004553:Electric Conductivity; D006108:Graphite / Q000737:chemistry*; D017736:Ion-Selective Electrodes; D057230:Limit of Detection; D008345:Manganese / Q000032:analysis* / Q000737:chemistry; D008567:Membranes, Artificial; D010946:Plants, Medicinal / Q000737:chemistry; D011199:Potentiometry; D015203:Reproducibility of Results; D014675:Vegetables / Q000737:chemistry
chemical_list: D008567:Membranes, Artificial; D008345:Manganese; D006108:Graphite