Silver(I)-selective electrode based on [Bz2Oxo4(18)dieneS4] tetrathia macrocyclic carrier.
A polystyrene-based membrane of 7,8:16,17-dibenzo-6,9,15,18-tetraoxo-1,5,10,14-tetrathiacyclooctadeca-7,16-diene [Bz2Oxo4(18)dieneS4] was fabricated using sodium tetraphenylborate (NaTPB) and dioctyl phthalate (DOP) as anion excluder and plasticizing agent. The best performance was obtained from the membrane with the composition ionophore [Bz2Oxo4(18)dieneS4]:polystyrene:DOP:NaTPB, 5:100:150:10 (w/w). The response of the electrode was linear over a wide range of concentration, 1.26 x 10(-6)-1.00 x 10(-1) mol L(-1) for silver ion with a Nernstian slope of 58.4 +/- 0.1 mV per decade and a detection limit of 1.0 x 10(-6) mol L(-1). The electrode was found to be chemically inert and of adequate stability with a response time of 10 s and could be used for a period of 3 months without change of potential. It worked satisfactorily in mixtures containing up to 35% (v/v) non-aqueous content. The proposed membrane sensor had good selectivity for Ag+ over a wide variety of metal ions in the pH range 2.2-8.5. It was successfully used as an indicator electrode in potentiometric titration of silver ion. The electrode was also useful for determination of Ag+ in waste from photographic films.
Singh
Ashok Kumar
AK
Department of Chemistry, Indian Institute of Technology-Roorkee, Roorkee 247 667, India. akscyfcy@iitr.ernet.in
Saxena
Puja
P
D004566:Electrodes; D006573:Heterocyclic Compounds, 1-Ring / Q000737:chemistry*; D006575:Heterocyclic Compounds, 3-Ring / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D047028:Macrocyclic Compounds / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*
C520416:7,8-16,17-dibenzo-6,9,15,18-tetraoxo-1,5,10,14-tetrathiacyclooctadeca-7,16-diene; D006573:Heterocyclic Compounds, 1-Ring; D006575:Heterocyclic Compounds, 3-Ring; D047028:Macrocyclic Compounds; D012834:Silver