Fabrication of Plasticized Polymer Membrane for Silver Ion Selective Electrode Using Anthraquinone Derivative as an Ionophore

Authors

  • Wanwisa Janrungroatsakul
  • Thancharin Thanasiwiwat
  • Duangrat Thongkum
  • Thawatchai Tuntulani

Abstract

The fabrication of silver ion selective electrode (Ag-ISE) was carried out using polyvinyl chloride (PVC) membrane having anthraquinone derivative, L1, as ionophore, DOS as plasticizer and KTpClPB as ionic additive in 25, 50 and 75 mol% (relative to L1). The polymeric membrane electrode showed high response to Ag+ compared to other cations (Na+, K+, Mg2+, Ca2+, Ni2+, Cu2+, Zn2+, Cd2+, Hg2+ and Pb2+). The selectivity coefficients () of the polymeric membrane electrodes were determined by separate solution method (SSM), and            the results showed that other metal ions, except Cu2+ and Hg2+, had significantly lower selectivity coefficients than that of Ag+. The optimized membrane electrode exhibited near theoretical Nernstian slope of 55.41 ± 0.6 mV decade-1 with a linear working range from 1.0 x 10-5 to 1.0 x 10-2 mol L-1 and a detection limit of 8.74 x 10-7 mol L-1. Keywords  :  polymeric membrane electrode, ionophore, plasticizer, silver ion

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Published

2016-07-06