A Silver Ion Potentiometric Sensor Based on a Synthesized 1,3-Benzocrown Macrocyclic Diamide as Neutral Carrier
Rey Y. Capangpangana,c, Florian R. del Mundoa,b, Susan D. Arcoa,b,
Jose S. Solisa, and Rofeamor P. Obenaa,d*
aInstitute of Chemistry, University of the Philippines, Quezon City, Philippines
bNatural Sciences Research Institute, University of the Philippines, Quezon City, Philippines
cCaraga State University, Ampayon, Butuan City, CARAGA Philippines
dInstitute of Chemistry, Academia Sinica, Nangang, Taipei, Taiwan
A synthesized benzo-crown macrocycle, 1,15-diaza-3,4;12,13-dibenzo-5,8,11-trioxacyclooctadecane-2,14-dione (1,3-MDA), was employed as an ionophore in the fabrication of polymeric ion-selective electrodes (ISE) for silver ion. The electrode membrane ingredients consisting of PVC/Plasticizer (o-NPOE) ratio of 0.94 and ionophore/additive ratio of 2.0 exhibited near Nernstian response of 57.75 mV/decade activity of Ag+ over a linear concentration range of 10-6 M to 10-3 M (R2 = 0.9921). The dynamic response time of this electrode was ~2 min at pH range of 3-9. The sensor has a limit of detection (LOD) of 6.32 x 10-7 M, and was stable for at least one month. Initial investigation on the applicability of this new ISE for the detection of silver ions in photographic wastewater sample and comparison of its performance with conventional method (Atomic Absorption Spectroscopy) were also reported.
Continuous interest has been focused on the design and synthesis of new functionalized macrocycles (Faridbod et al. 2007) for the selective detection of metal ions and its use as neutral carrier for ion-selective electrodes. After the discovery of valinomycin as ion carrier for K+ ion, neutral organic compounds such as crown ethers (Ganjali et. al 2003), macrocyclic amides (Malinowska 2000) as well as macrocyclic calixarene compounds (Parsa et. al. 2007) have been used as ion carriers or ionophores for many polymeric membrane electrodes. Various macrocyclic diamides have been designed and tested for their utility as neutral ionophores in the construction of PVC-based . . . . . . . . . . . . . . . .
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