title: Anion recognition through amide-based dendritic molecule: a poly(vinyl chloride) based sensor for nitrate ion.
abstract: Poly(vinyl chloride) (PVC)-based membranes of N,N-bis-succinamide-based dendritic molecule with tetrabutyl ammonium bromide (TBAB) as a cation inhibitor and dibutylphthalate (DBP), dioctylphthalate (DOP), dibutyl (butyl) phosphonate (DBBP) and 1-chloronaphthalene (CN) as plasticizing solvent mediators were prepared and used as nitrate ion-selective electrodes. Optimum performance was observed with the membrane having I-PVC-TBAB-DBP in the ratio 1:33:1:65 (w/w). The electrode has a linear response to nitrate with a detection limit of 3.9 × 10(-5) ± 0.07 M and Nernstian compliance (57.0 ± 0.2 mV/decade) between pH 2.8 and 9.6 with a fast response time of about 20s. The selectivity coefficient values of the order of 0.001 for mono-; bi- and trivalent anions; indicate high selectivity for nitrate ions over these anions. The preparation procedure of the electrode is very easy and inexpensive. The electrodes were used over a period of 45 days with good reproducibility. The analytical usefulness of the proposed electrode has been evaluated by its application in the determination of nitrate ions in waste water samples.
authors: Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, India. vinodfcy@iitr.ernet.in
authors: Vinod Kumar
authors: VK
authors: Gupta
authors: Lok Pratap
authors: LP
authors: Singh
authors: Sudeshna
authors: S
authors: Chandra
authors: Sunita
authors: S
authors: Kumar
authors: Rakesh
authors: R
authors: Singh
authors: Bhavana
authors: B
authors: Sethi