title: Comparative evaluation of Dy(III) selective poly(vinyl) chloride based membrane electrodes of macrocyclic tetraimine Schiff's bases.
abstract: Three different derivatives of macrocyclic tetraimine Schiff's base have been synthesized and explored as a neutral ionophores for preparing poly(vinyl chloride) based membrane sensors selective to Dy(3+). The addition of sodium tetraphenyl borate and various plasticizers, viz., o-NPOE, DBP, DBBP, DOP and CN has been found to substantially improve the performance of the sensors. The best performance was obtained with the sensor no. 1 having membrane of Schiff's base (SL-1) with composition (w/w) SL-1 (4.5%): PVC (30.5%): o-NPOE (59.5%): NaTPB (5.5%). This sensor exhibits Nernstian response with slope 19.4 mV/decade of activity in the concentration range of 10(-8) to 1.0x10(-2)M Dy(3+), performs satisfactorily over wide pH range of (2.8-7.2) with a fast response time (10s). The sensor was also found to work satisfactorily in partially non-aqueous media up to 20% (v/v) content of acetonitrile, methanol or ethanol. The proposed sensor can be used over a period of 1.5 months without significant drift in potentials. The sensor has been also utilized for the determination of Dy(3+) level in different soil samples.
authors: Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India. vinodfcy@iitr.ernet.in
authors: V K
authors: VK
authors: Gupta
authors: Manoj K
authors: MK
authors: Pal
authors: Ashok K
authors: AK
authors: Singh
mesh_terms: D004419:Dysprosium / Q000032:analysis*; D007097:Imines; D017736:Ion-Selective Electrodes / Q000592:standards*; D011143:Polyvinyl Chloride; D012545:Schiff Bases / Q000737:chemistry*
chemical_list: D007097:Imines; D012545:Schiff Bases; D004419:Dysprosium; D011143:Polyvinyl Chloride