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The role of PVC in ion selective electrode membranes
Affiliation:1. University of Ottawa, Earth and Environmental Sciences, 25 Templeton Street, Ottawa, ON K1N 6N5, Canada;2. Geological Survey of Canada, Natural Resources Canada, Québec City, Canada;3. Nuclear Waste Management Organization, Toronto, Canada;1. Bioanalysis and Drugs Analysis Department, Faculty of Pharmacy, Medical University of Warsaw, 1 Banacha Street, 02-097 Warsaw, Poland;2. Department of Cardiology, Grochowski Hospital, Postgraduate Medical School, Warsaw, Poland;1. ECsens, Department of Analytical Chemistry, Campus Fuentenueva, Faculty of Sciences, University of Granada, E-18071 Granada, Spain;2. Institute of Materials, Faculty of Sciences, University of Alicante, E-03080 Alicante, Spain
Abstract:The behaviour of a solution of NaBPh4 in a PVC membrane plasticized by di-octyl sebacate is compared with a solution of NaBPh4 in pure liquid di-octyl sebacate. In the liquid the NaBPh4 is present as ion pairs with ~ 0.2% of these dissociated in a 1 mM solution. By contrast in the membrane 1 mM solution is 74% dissociated. This difference in behaviour arises chiefly from the higher dielectric constant of the membrane phase.
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